tail-merge-assert.ll | Explore in Territory

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -sink-common-insts  -S < %s | FileCheck %s

; Test that we tail merge this kind of code with glibc-style assertion
; failure calls:
;   #include <assert.h>
;   void merge_glibc_asserts(unsigned x, unsigned y) {
;     assert(x < y);
;     assert(y - x > 7);
;     assert(y - x < 40);
;   }
;
; glibc's __assert_fail function takes four parameters, and it is profitable to
; phi two of them.

@.str = private unnamed_addr constant [6 x i8] c"x < y\00", align 1
@.str.1 = private unnamed_addr constant [6 x i8] c"t.cpp\00", align 1
@__PRETTY_FUNCTION__._Z1fjj = private unnamed_addr constant [35 x i8] c"void f(unsigned int, unsigned int)\00", align 1
@.str.2 = private unnamed_addr constant [10 x i8] c"y - x > 7\00", align 1
@.str.3 = private unnamed_addr constant [11 x i8] c"y - x < 40\00", align 1

declare void @glibc_assert_fail(ptr, ptr, i32, ptr)

define void @merge_glibc_asserts(i32 %x, i32 %y) {
; CHECK-LABEL: @merge_glibc_asserts(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i32 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[COND_END:%.*]], label [[COND_FALSE:%.*]]
; CHECK:       cond.false:
; CHECK-NEXT:    tail call void @glibc_assert_fail(ptr @.str, ptr @.str.1, i32 3, ptr @__PRETTY_FUNCTION__._Z1fjj)
; CHECK-NEXT:    unreachable
; CHECK:       cond.end:
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[Y]], [[X]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ugt i32 [[SUB]], 7
; CHECK-NEXT:    br i1 [[CMP1]], label [[COND_END4:%.*]], label [[COND_FALSE3:%.*]]
; CHECK:       cond.false3:
; CHECK-NEXT:    tail call void @glibc_assert_fail(ptr @.str.2, ptr @.str.1, i32 4, ptr @__PRETTY_FUNCTION__._Z1fjj)
; CHECK-NEXT:    unreachable
; CHECK:       cond.end4:
; CHECK-NEXT:    [[CMP6:%.*]] = icmp ult i32 [[SUB]], 40
; CHECK-NEXT:    br i1 [[CMP6]], label [[COND_END9:%.*]], label [[COND_FALSE8:%.*]]
; CHECK:       cond.false8:
; CHECK-NEXT:    tail call void @glibc_assert_fail(ptr @.str.3, ptr @.str.1, i32 5, ptr @__PRETTY_FUNCTION__._Z1fjj)
; CHECK-NEXT:    unreachable
; CHECK:       cond.end9:
; CHECK-NEXT:    ret void
;
entry:
  %cmp = icmp ugt i32 %y, %x
  br i1 %cmp, label %cond.end, label %cond.false

cond.false:                                       ; preds = %entry
  tail call void @glibc_assert_fail(ptr @.str, ptr @.str.1, i32 3, ptr @__PRETTY_FUNCTION__._Z1fjj) #2
  unreachable

cond.end:                                         ; preds = %entry
  %sub = sub i32 %y, %x
  %cmp1 = icmp ugt i32 %sub, 7
  br i1 %cmp1, label %cond.end4, label %cond.false3

cond.false3:                                      ; preds = %cond.end
  tail call void @glibc_assert_fail(ptr @.str.2, ptr @.str.1, i32 4, ptr @__PRETTY_FUNCTION__._Z1fjj) #2
  unreachable

cond.end4:                                        ; preds = %cond.end
  %cmp6 = icmp ult i32 %sub, 40
  br i1 %cmp6, label %cond.end9, label %cond.false8

cond.false8:                                      ; preds = %cond.end4
  tail call void @glibc_assert_fail(ptr @.str.3, ptr @.str.1, i32 5, ptr @__PRETTY_FUNCTION__._Z1fjj) #2
  unreachable

cond.end9:                                        ; preds = %cond.end4
  ret void
}
llvm/llvm/test/Transforms/SimplifyCFG/tail-merge-assert.ll
