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llvm-mirror/test/CodeGen/Thumb2/thumb2-cbnz.ll
Kyle Butt e9b17f6bf5 Codegen: Fix broken assumption in Tail Merge.
Tail merge was making the assumption that a layout successor or
predecessor was always a cfg successor/predecessor. Remove that
assumption. Changes to tests are necessary because the errant cfg edges
were preventing optimizations.

llvm-svn: 273700
2016-06-24 18:16:36 +00:00

36 lines
1.0 KiB
LLVM

; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -arm-atomic-cfg-tidy=0 | FileCheck %s
; rdar://7354379
declare double @foo(double) nounwind readnone
define void @t(i32 %c, double %b) {
entry:
; CHECK: cmp r0, #0
%cmp1 = icmp ne i32 %c, 0
br i1 %cmp1, label %bb3, label %bb1
bb1: ; preds = %entry
unreachable
bb3: ; preds = %entry
%cmp2 = icmp ne i32 %c, 0
br i1 %cmp2, label %bb7, label %bb5
bb5: ; preds = %bb3
unreachable
bb7: ; preds = %bb3
%cmp3 = icmp ne i32 %c, 0
br i1 %cmp3, label %bb11, label %bb9
bb9: ; preds = %bb7
; CHECK: cbnz
%0 = tail call double @foo(double %b) nounwind readnone ; <double> [#uses=0]
br label %bb11
bb11: ; preds = %bb9, %bb7
%1 = getelementptr i32, i32* undef, i32 0
store i32 0, i32* %1
ret void
}