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2210c0bea8
tail merging support to handle more cases. - Recognize several cases where tail merging is beneficial even when the tail size is smaller than the generic threshold. - Make use of MachineInstrDesc::isBarrier to help detect non-fallthrough blocks. - Check for and avoid disrupting fall-through edges in more cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86871 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
991 B
LLVM
34 lines
991 B
LLVM
; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 | FileCheck %s
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; rdar://7354379
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declare arm_apcscc double @floor(double) nounwind readnone
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define void @t(i1 %a, double %b) {
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entry:
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br i1 %a, label %bb3, label %bb1
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bb1: ; preds = %entry
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unreachable
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bb3: ; preds = %entry
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br i1 %a, label %bb7, label %bb5
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bb5: ; preds = %bb3
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unreachable
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bb7: ; preds = %bb3
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br i1 %a, label %bb11, label %bb9
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bb9: ; preds = %bb7
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; CHECK: cmp r0, #0
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; CHECK-NEXT: cmp r0, #0
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; CHECK-NEXT: cbnz
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%0 = tail call arm_apcscc double @floor(double %b) nounwind readnone ; <double> [#uses=0]
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br label %bb11
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bb11: ; preds = %bb9, %bb7
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%1 = getelementptr i32* undef, i32 0
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store i32 0, i32* %1
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ret void
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}
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