; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=indvars -S < %s | FileCheck %s
declare i1 @cond()
; Range check here can be turned into invariant check.
define i32 @test_simple_case(i32 %start, i32 %len) {
; CHECK-LABEL: @test_simple_case(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: br i1 [[ZERO_CHECK]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: br i1 [[RANGE_CHECK_FIRST_ITER]], label [[BACKEDGE]], label [[FAILED_2:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
br i1 %zero_check, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
br i1 %range_check, label %backedge, label %failed_2
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; This example is equivalent to @test_simple_case, with only difference that
; both checks are littered with extra irrelevant conditions. We should be able
; to replace it with invariant despite this fact.
; https://alive2.llvm.org/ce/z/G4iW8c
define i32 @test_litter_conditions(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_2:%.*]] = and i1 [[RANGE_CHECK_FIRST_ITER]], [[FAKE_2]]
; CHECK-NEXT: br i1 [[AND_2]], label [[BACKEDGE]], label [[FAILED_2:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%and_2 = and i1 %range_check, %fake_2
br i1 %and_2, label %backedge, label %failed_2
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; Same as test_litter_conditions, but swapped exit block branches
; and exit condition expressed by OR. Still optimizable.
define i32 @test_litter_conditions_inverse(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_inverse(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FAILED_FIRST_ITER:%.*]] = icmp uge i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[OR_2:%.*]] = or i1 [[RANGE_CHECK_FAILED_FIRST_ITER]], [[FAKE_2]]
; CHECK-NEXT: br i1 [[OR_2]], label [[FAILED_2:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check_failed = icmp uge i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%or_2 = or i1 %range_check_failed, %fake_2
br i1 %or_2, label %failed_2, label %backedge
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
define i32 @test_litter_conditions_01(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_01(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: br i1 [[RANGE_CHECK_FIRST_ITER]], label [[BACKEDGE]], label [[FAILED_2:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
br i1 %range_check, label %backedge, label %failed_2
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; Same as test_litter_conditions_01, but swapped exit block branches
; and condition expressed by OR. Still optimizable.
define i32 @test_litter_conditions_01_inverse(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_01_inverse(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FAILED_FIRST_ITER:%.*]] = icmp uge i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: br i1 [[RANGE_CHECK_FAILED_FIRST_ITER]], label [[FAILED_2:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check_failed = icmp uge i32 %iv.minus.1, %len
br i1 %range_check_failed, label %failed_2, label %backedge
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; TODO: Simplified version 2 of test_litter_conditions.
define i32 @test_litter_conditions_02(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_02(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: br i1 [[ZERO_CHECK]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_2:%.*]] = and i1 [[RANGE_CHECK_FIRST_ITER]], [[FAKE_2]]
; CHECK-NEXT: br i1 [[AND_2]], label [[BACKEDGE]], label [[FAILED_2:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
br i1 %zero_check, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%and_2 = and i1 %range_check, %fake_2
br i1 %and_2, label %backedge, label %failed_2
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; Same as test_litter_conditions_02, but swapped exit block branches,
; and condition is expressed as OR. Still optimizable.
define i32 @test_litter_conditions_02_inverse(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_02_inverse(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FAILED_FIRST_ITER:%.*]] = icmp uge i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: br i1 [[ZERO_CHECK]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[OR_2:%.*]] = or i1 [[RANGE_CHECK_FAILED_FIRST_ITER]], [[FAKE_2]]
; CHECK-NEXT: br i1 [[OR_2]], label [[FAILED_2:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
br i1 %zero_check, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check_failed = icmp uge i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%or_2 = or i1 %range_check_failed, %fake_2
br i1 %or_2, label %failed_2, label %backedge
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; Same as @test_litter_conditions, but all conditions are computed in
; header block. Make sure we infer fact from the right context.
; https://alive2.llvm.org/ce/z/JiD-Pw
define i32 @test_litter_conditions_bad_context(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_bad_context(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_2:%.*]] = and i1 [[RANGE_CHECK_FIRST_ITER]], [[FAKE_2]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: br i1 [[AND_2]], label [[BACKEDGE]], label [[FAILED_2:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%and_2 = and i1 %range_check, %fake_2
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
br i1 %and_2, label %backedge, label %failed_2
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; Same as @test_litter_conditions_bad_context, but swapped exit block branches,
; and conditions expressed as OR. Still optimizable.
define i32 @test_litter_conditions_bad_context_inverse(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_bad_context_inverse(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FAILED_FIRST_ITER:%.*]] = icmp uge i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[OR_2:%.*]] = or i1 [[RANGE_CHECK_FAILED_FIRST_ITER]], [[FAKE_2]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: br i1 [[OR_2]], label [[FAILED_2:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
%iv.minus.1 = add i32 %iv, -1
%range_check_failed = icmp uge i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%or_2 = or i1 %range_check_failed, %fake_2
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
br i1 %or_2, label %failed_2, label %backedge
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; This test is equivalent to @test_simple_case, with only difference
; that both checks are merged together into one 'and' check. This
; should not prevent turning the range check into invariant.
; https://alive2.llvm.org/ce/z/G-2ERB
define i32 @test_and_conditions(i32 %start, i32 %len) {
; CHECK-LABEL: @test_and_conditions(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[BOTH_CHECKS:%.*]] = and i1 [[ZERO_CHECK]], [[RANGE_CHECK_FIRST_ITER]]
; CHECK-NEXT: br i1 [[BOTH_CHECKS]], label [[BACKEDGE]], label [[FAILED:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA1:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA1]]
; CHECK: failed:
; CHECK-NEXT: ret i32 -3
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
%both_checks = and i1 %zero_check, %range_check
br i1 %both_checks, label %backedge, label %failed
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed:
ret i32 -3
}
; Same as test_and_conditions, but swapped exit block branches,
; and condition is expressed as OR. Still optimizable.
define i32 @test_and_conditions_inverse(i32 %start, i32 %len) {
; CHECK-LABEL: @test_and_conditions_inverse(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FAILED_FIRST_ITER:%.*]] = icmp uge i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK_FAILED:%.*]] = icmp eq i32 [[IV]], 0
; CHECK-NEXT: [[EITHER_CHECK:%.*]] = or i1 [[ZERO_CHECK_FAILED]], [[RANGE_CHECK_FAILED_FIRST_ITER]]
; CHECK-NEXT: br i1 [[EITHER_CHECK]], label [[FAILED:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA1:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA1]]
; CHECK: failed:
; CHECK-NEXT: ret i32 -3
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check_failed = icmp eq i32 %iv, 0
%iv.minus.1 = add i32 %iv, -1
%range_check_failed = icmp uge i32 %iv.minus.1, %len
%either_check = or i1 %zero_check_failed, %range_check_failed
br i1 %either_check, label %failed, label %backedge
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed:
ret i32 -3
}
; Same as test_litter_conditions, but with logical AND.
define i32 @test_litter_conditions_logical_and(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_logical_and(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_2:%.*]] = select i1 [[RANGE_CHECK_FIRST_ITER]], i1 [[FAKE_2]], i1 false
; CHECK-NEXT: br i1 [[AND_2]], label [[BACKEDGE]], label [[FAILED_2:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%and_2 = select i1 %range_check, i1 %fake_2, i1 false
br i1 %and_2, label %backedge, label %failed_2
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; Same as test_litter_conditions_inverse, but with logical OR.
define i32 @test_litter_conditions_inverse_logical_or(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_inverse_logical_or(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FAILED_FIRST_ITER:%.*]] = icmp uge i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[OR_2:%.*]] = select i1 [[RANGE_CHECK_FAILED_FIRST_ITER]], i1 true, i1 [[FAKE_2]]
; CHECK-NEXT: br i1 [[OR_2]], label [[FAILED_2:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA2:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA2]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check_failed = icmp uge i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%or_2 = select i1 %range_check_failed, i1 true, i1 %fake_2
br i1 %or_2, label %failed_2, label %backedge
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
}
; Same as test_and_conditions, but with logical AND.
define i32 @test_and_conditions_logical_and(i32 %start, i32 %len) {
; CHECK-LABEL: @test_and_conditions_logical_and(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[BOTH_CHECKS:%.*]] = select i1 [[ZERO_CHECK]], i1 [[RANGE_CHECK_FIRST_ITER]], i1 false
; CHECK-NEXT: br i1 [[BOTH_CHECKS]], label [[BACKEDGE]], label [[FAILED:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA1:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA1]]
; CHECK: failed:
; CHECK-NEXT: ret i32 -3
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check = icmp ne i32 %iv, 0
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
%both_checks = select i1 %zero_check, i1 %range_check, i1 false
br i1 %both_checks, label %backedge, label %failed
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed:
ret i32 -3
}
; Same as test_and_conditions_inverse, but with logical OR.
define i32 @test_and_conditions_inverse_logical_or(i32 %start, i32 %len) {
; CHECK-LABEL: @test_and_conditions_inverse_logical_or(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FAILED_FIRST_ITER:%.*]] = icmp uge i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[ZERO_CHECK_FAILED:%.*]] = icmp eq i32 [[IV]], 0
; CHECK-NEXT: [[EITHER_CHECK:%.*]] = select i1 [[ZERO_CHECK_FAILED]], i1 true, i1 [[RANGE_CHECK_FAILED_FIRST_ITER]]
; CHECK-NEXT: br i1 [[EITHER_CHECK]], label [[FAILED:%.*]], label [[BACKEDGE]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA1:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA1]]
; CHECK: failed:
; CHECK-NEXT: ret i32 -3
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%zero_check_failed = icmp eq i32 %iv, 0
%iv.minus.1 = add i32 %iv, -1
%range_check_failed = icmp uge i32 %iv.minus.1, %len
%either_check = select i1 %zero_check_failed, i1 true, i1 %range_check_failed
br i1 %either_check, label %failed, label %backedge
backedge:
%iv.next = add i32 %iv, -1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed:
ret i32 -3
}
; Same as test_litter_conditions, but an extra check with known exact exit count is preventing the opt.
define i32 @test_litter_conditions_constant(i32 %start, i32 %len) {
; CHECK-LABEL: @test_litter_conditions_constant(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
; CHECK-NEXT: [[RANGE_CHECK_FIRST_ITER:%.*]] = icmp ult i32 [[TMP0]], [[LEN:%.*]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[CANONICAL_IV:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[CANONICAL_IV_NEXT:%.*]], [[BACKEDGE]] ]
; CHECK-NEXT: [[CONSTANT_CHECK:%.*]] = icmp ult i32 [[CANONICAL_IV]], 65635
; CHECK-NEXT: br i1 [[CONSTANT_CHECK]], label [[CONSTANT_CHECK_PASSED:%.*]], label [[CONSTANT_CHECK_FAILED:%.*]]
; CHECK: constant_check_passed:
; CHECK-NEXT: [[ZERO_CHECK:%.*]] = icmp ne i32 [[IV]], 0
; CHECK-NEXT: [[FAKE_1:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[ZERO_CHECK]], [[FAKE_1]]
; CHECK-NEXT: br i1 [[AND_1]], label [[RANGE_CHECK_BLOCK:%.*]], label [[FAILED_1:%.*]]
; CHECK: range_check_block:
; CHECK-NEXT: [[FAKE_2:%.*]] = call i1 @cond()
; CHECK-NEXT: [[AND_2:%.*]] = and i1 [[RANGE_CHECK_FIRST_ITER]], [[FAKE_2]]
; CHECK-NEXT: br i1 [[AND_2]], label [[BACKEDGE]], label [[FAILED_2:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[CANONICAL_IV_NEXT]] = add nuw nsw i32 [[CANONICAL_IV]], 1
; CHECK-NEXT: [[LOOP_COND:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[DONE:%.*]], label [[LOOP]]
; CHECK: done:
; CHECK-NEXT: [[IV_LCSSA3:%.*]] = phi i32 [ [[IV]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_LCSSA3]]
; CHECK: failed_1:
; CHECK-NEXT: ret i32 -1
; CHECK: failed_2:
; CHECK-NEXT: ret i32 -2
; CHECK: constant_check_failed:
; CHECK-NEXT: ret i32 -3
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%canonical_iv = phi i32 [0, %entry], [%canonical_iv.next, %backedge]
%constant_check = icmp ult i32 %canonical_iv, 65635
br i1 %constant_check, label %constant_check_passed, label %constant_check_failed
constant_check_passed:
%zero_check = icmp ne i32 %iv, 0
%fake_1 = call i1 @cond()
%and_1 = and i1 %zero_check, %fake_1
br i1 %and_1, label %range_check_block, label %failed_1
range_check_block:
%iv.minus.1 = add i32 %iv, -1
%range_check = icmp ult i32 %iv.minus.1, %len
%fake_2 = call i1 @cond()
%and_2 = and i1 %range_check, %fake_2
br i1 %and_2, label %backedge, label %failed_2
backedge:
%iv.next = add i32 %iv, -1
%canonical_iv.next = add i32 %canonical_iv, 1
%loop_cond = call i1 @cond()
br i1 %loop_cond, label %done, label %loop
done:
ret i32 %iv
failed_1:
ret i32 -1
failed_2:
ret i32 -2
constant_check_failed:
ret i32 -3
}
; TODO: the backedge is predicated by iv.next <u len. It means that starting the
; 2nd iteration, iv <u len is a known fact. We can replace %check with
; %check.first.iter = icmp ult i32 0, %len.
define i32 @test_predicated_backedge_no_side_exit(i32 %len) {
; CHECK-LABEL: @test_predicated_backedge_no_side_exit(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMAX:%.*]] = call i32 @llvm.umax.i32(i32 [[LEN:%.*]], i32 1)
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[UMAX]], -1
; CHECK-NEXT: [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[LEN]], i32 [[TMP0]])
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[LEN]], [[UMIN]]
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[IV_NEXT]] = add nuw i32 [[IV]], 1
; CHECK-NEXT: br i1 [[TMP1]], label [[BACKEDGE]], label [[FAILED:%.*]]
; CHECK: backedge:
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ult i32 [[IV_NEXT]], [[LEN]]
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: [[IV_NEXT_LCSSA1:%.*]] = phi i32 [ [[IV_NEXT]], [[BACKEDGE]] ]
; CHECK-NEXT: ret i32 [[IV_NEXT_LCSSA1]]
; CHECK: failed:
; CHECK-NEXT: ret i32 -1
;
entry:
br label %loop
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
%iv.next = add i32 %iv, 1
%check = icmp ult i32 %iv, %len
br i1 %check, label %backedge, label %failed
backedge:
%loop.cond = icmp ult i32 %iv.next, %len
br i1 %loop.cond, label %loop, label %exit
exit:
ret i32 %iv.next
failed:
ret i32 -1
}
; TODO: the backedge is predicated by iv.next <u len. It means that starting the
; 2nd iteration, iv <u len is a known fact. We can replace %check with
; %check.first.iter = icmp ult i32 0, %len.
define i32 @test_predicated_backedge_with_side_exit(i32 %len) {
; CHECK-LABEL: @test_predicated_backedge_with_side_exit(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[UMAX:%.*]] = call i32 @llvm.umax.i32(i32 [[LEN:%.*]], i32 1)
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[IV_NEXT]] = add nuw i32 [[IV]], 1
; CHECK-NEXT: [[CHECK:%.*]] = icmp ult i32 [[IV]], [[LEN]]
; CHECK-NEXT: br i1 [[CHECK]], label [[INNER_BLOCK:%.*]], label [[FAILED:%.*]]
; CHECK: inner_block:
; CHECK-NEXT: [[COND_1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[COND_1]], label [[BACKEDGE]], label [[FAILED]]
; CHECK: backedge:
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ult i32 [[IV_NEXT]], [[LEN]]
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret i32 [[UMAX]]
; CHECK: failed:
; CHECK-NEXT: ret i32 -1
;
entry:
br label %loop
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
%iv.next = add i32 %iv, 1
%check = icmp ult i32 %iv, %len
br i1 %check, label %inner_block, label %failed
inner_block:
%cond_1 = call i1 @cond()
br i1 %cond_1, label %backedge, label %failed
backedge:
%loop.cond = icmp ult i32 %iv.next, %len
br i1 %loop.cond, label %loop, label %exit
exit:
ret i32 %iv.next
failed:
ret i32 -1
}
; TODO: the backedge is predicated by iv.next <u len. It means that starting the
; 2nd iteration, iv <u len is a known fact. We can replace %check with
; %check.first.iter = icmp ult i32 %start, %len.
define i32 @test_predicated_backedge_with_side_exit_unknown_start(i32 %start, i32 %len) {
; CHECK-LABEL: @test_predicated_backedge_with_side_exit_unknown_start(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], 1
; CHECK-NEXT: [[UMAX:%.*]] = call i32 @llvm.umax.i32(i32 [[LEN:%.*]], i32 [[TMP0]])
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT: [[CHECK:%.*]] = icmp ult i32 [[IV]], [[LEN]]
; CHECK-NEXT: br i1 [[CHECK]], label [[INNER_BLOCK:%.*]], label [[FAILED:%.*]]
; CHECK: inner_block:
; CHECK-NEXT: [[COND_1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[COND_1]], label [[BACKEDGE]], label [[FAILED]]
; CHECK: backedge:
; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp ult i32 [[IV_NEXT]], [[LEN]]
; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret i32 [[UMAX]]
; CHECK: failed:
; CHECK-NEXT: ret i32 -1
;
entry:
br label %loop
loop:
%iv = phi i32 [%start, %entry], [%iv.next, %backedge]
%iv.next = add i32 %iv, 1
%check = icmp ult i32 %iv, %len
br i1 %check, label %inner_block, label %failed
inner_block:
%cond_1 = call i1 @cond()
br i1 %cond_1, label %backedge, label %failed
backedge:
%loop.cond = icmp ult i32 %iv.next, %len
br i1 %loop.cond, label %loop, label %exit
exit:
ret i32 %iv.next
failed:
ret i32 -1
}
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