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9f33e3748e
This patch uses the metadata defined in D12341 to avoid creating an unpredictable branch. Differential Revision: http://reviews.llvm.org/D12343 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@246691 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.3 KiB
LLVM
55 lines
1.3 KiB
LLVM
; RUN: llc < %s -mtriple=i386-unknown-unknown -jump-is-expensive=0 | FileCheck %s --check-prefix=JUMP2 --check-prefix=CHECK
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; RUN: llc < %s -mtriple=i386-unknown-unknown -jump-is-expensive=1 | FileCheck %s --check-prefix=JUMP1 --check-prefix=CHECK
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define void @foo(i32 %X, i32 %Y, i32 %Z) nounwind {
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; JUMP2-LABEL: foo:
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; JUMP2-DAG: jl
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; JUMP2-DAG: je
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;
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; JUMP1-LABEL: foo:
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; JUMP1-DAG: sete
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; JUMP1-DAG: setl
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; JUMP1: orb
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; JUMP1: jne
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entry:
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%tmp1 = icmp eq i32 %X, 0
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%tmp3 = icmp slt i32 %Y, 5
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%tmp4 = or i1 %tmp3, %tmp1
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br i1 %tmp4, label %cond_true, label %UnifiedReturnBlock
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cond_true:
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%tmp5 = tail call i32 (...) @bar( )
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ret void
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UnifiedReturnBlock:
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ret void
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}
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; If the branch is unpredictable, don't add another branch
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; regardless of whether they are expensive or not.
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define void @unpredictable(i32 %X, i32 %Y, i32 %Z) nounwind {
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; CHECK-LABEL: unpredictable:
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; CHECK-DAG: sete
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; CHECK-DAG: setl
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; CHECK: orb
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; CHECK: jne
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entry:
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%tmp1 = icmp eq i32 %X, 0
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%tmp3 = icmp slt i32 %Y, 5
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%tmp4 = or i1 %tmp3, %tmp1
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br i1 %tmp4, label %cond_true, label %UnifiedReturnBlock, !unpredictable !0
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cond_true:
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%tmp5 = tail call i32 (...) @bar( )
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ret void
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UnifiedReturnBlock:
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ret void
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}
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declare i32 @bar(...)
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!0 = !{}
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