; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -loop-reduce -S < %s | FileCheck %s
;
; Test LSR's use of SplitCriticalEdge during phi rewriting.
target triple = "x86_64-apple-darwin"
; Provide legal integer types.
target datalayout = "n8:16:32:64"
; Verify that identical edges are merged. rdar://problem/6453893
define ptr @test1() {
;
; CHECK-LABEL: @test1(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[LSR_IV:%.*]] = phi ptr [ [[SCEVGEP:%.*]], [[LOOP]] ], [ null, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[SCEVGEP]] = getelementptr i8, ptr [[LSR_IV]], i64 1
; CHECK-NEXT: br i1 false, label [[LOOP]], label [[LOOPEXIT:%.*]]
; CHECK: loopexit:
; CHECK-NEXT: [[SCEVGEP_LCSSA:%.*]] = phi ptr [ [[SCEVGEP]], [[LOOP]] ]
; CHECK-NEXT: br i1 false, label [[BBA:%.*]], label [[BBB:%.*]]
; CHECK: bbA:
; CHECK-NEXT: switch i32 0, label [[BBA_BB89_CRIT_EDGE:%.*]] [
; CHECK-NEXT: i32 47, label [[BBA_BB89_CRIT_EDGE]]
; CHECK-NEXT: i32 58, label [[BBA_BB89_CRIT_EDGE]]
; CHECK-NEXT: ]
; CHECK: bbA.bb89_crit_edge:
; CHECK-NEXT: br label [[BB89:%.*]]
; CHECK: bbB:
; CHECK-NEXT: switch i8 0, label [[BBB_BB89_CRIT_EDGE:%.*]] [
; CHECK-NEXT: i8 47, label [[BBB_BB89_CRIT_EDGE]]
; CHECK-NEXT: i8 58, label [[BBB_BB89_CRIT_EDGE]]
; CHECK-NEXT: ]
; CHECK: bbB.bb89_crit_edge:
; CHECK-NEXT: br label [[BB89]]
; CHECK: bb89:
; CHECK-NEXT: [[TMP75PHI:%.*]] = phi ptr [ [[SCEVGEP_LCSSA]], [[BBA_BB89_CRIT_EDGE]] ], [ [[SCEVGEP_LCSSA]], [[BBB_BB89_CRIT_EDGE]] ]
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: exit:
; CHECK-NEXT: ret ptr [[TMP75PHI]]
;
entry:
br label %loop
loop:
%rec = phi i32 [ %next, %loop ], [ 0, %entry ]
%next = add i32 %rec, 1
%tmp75 = getelementptr i8, ptr null, i32 %next
br i1 false, label %loop, label %loopexit
loopexit:
br i1 false, label %bbA, label %bbB
bbA:
switch i32 0, label %bb89 [
i32 47, label %bb89
i32 58, label %bb89
]
bbB:
switch i8 0, label %bb89 [
i8 47, label %bb89
i8 58, label %bb89
]
bb89:
%tmp75phi = phi ptr [ %tmp75, %bbA ], [ %tmp75, %bbA ], [ %tmp75, %bbA ], [ %tmp75, %bbB ], [ %tmp75, %bbB ], [ %tmp75, %bbB ]
br label %exit
exit:
ret ptr %tmp75phi
}
; Handle single-predecessor phis: PR13756
define ptr @test2() {
;
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[LSR_IV:%.*]] = phi ptr [ [[SCEVGEP:%.*]], [[LOOP]] ], [ null, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[SCEVGEP]] = getelementptr i8, ptr [[LSR_IV]], i64 1
; CHECK-NEXT: br i1 false, label [[LOOP]], label [[LOOPEXIT:%.*]]
; CHECK: loopexit:
; CHECK-NEXT: [[SCEVGEP_LCSSA1:%.*]] = phi ptr [ [[SCEVGEP]], [[LOOP]] ]
; CHECK-NEXT: [[SCEVGEP_LCSSA:%.*]] = phi ptr [ [[SCEVGEP]], [[LOOP]] ]
; CHECK-NEXT: br i1 false, label [[BBA:%.*]], label [[BBB:%.*]]
; CHECK: bbA:
; CHECK-NEXT: switch i32 0, label [[BB89:%.*]] [
; CHECK-NEXT: i32 47, label [[BB89]]
; CHECK-NEXT: i32 58, label [[BB89]]
; CHECK-NEXT: ]
; CHECK: bbB:
; CHECK-NEXT: switch i8 0, label [[BBB_EXIT_CRIT_EDGE:%.*]] [
; CHECK-NEXT: i8 47, label [[BBB_EXIT_CRIT_EDGE]]
; CHECK-NEXT: i8 58, label [[BBB_EXIT_CRIT_EDGE]]
; CHECK-NEXT: ]
; CHECK: bbB.exit_crit_edge:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: bb89:
; CHECK-NEXT: [[TMP75PHI:%.*]] = phi ptr [ [[SCEVGEP_LCSSA1]], [[BBA]] ], [ [[SCEVGEP_LCSSA1]], [[BBA]] ], [ [[SCEVGEP_LCSSA1]], [[BBA]] ]
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[RESULT:%.*]] = phi ptr [ [[TMP75PHI]], [[BB89]] ], [ [[SCEVGEP_LCSSA]], [[BBB_EXIT_CRIT_EDGE]] ]
; CHECK-NEXT: ret ptr [[RESULT]]
;
entry:
br label %loop
loop:
%rec = phi i32 [ %next, %loop ], [ 0, %entry ]
%next = add i32 %rec, 1
%tmp75 = getelementptr i8, ptr null, i32 %next
br i1 false, label %loop, label %loopexit
loopexit:
br i1 false, label %bbA, label %bbB
bbA:
switch i32 0, label %bb89 [
i32 47, label %bb89
i32 58, label %bb89
]
bbB:
switch i8 0, label %exit [
i8 47, label %exit
i8 58, label %exit
]
bb89:
%tmp75phi = phi ptr [ %tmp75, %bbA ], [ %tmp75, %bbA ], [ %tmp75, %bbA ]
br label %exit
exit:
%result = phi ptr [ %tmp75phi, %bb89 ], [ %tmp75, %bbB ], [ %tmp75, %bbB ], [ %tmp75, %bbB ]
ret ptr %result
}
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