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5f4e6e1ec0
Optimize the select instructions sequence to use the EFLAGS directly from a compare when possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211543 91177308-0d34-0410-b5e6-96231b3b80d8
17 lines
637 B
LLVM
17 lines
637 B
LLVM
; RUN: llc -mtriple x86_64-apple-darwin -O0 -o - < %s | FileCheck %s
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; Make sure we only use the less significant bit of the value that feeds the
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; select. Otherwise, we may account for a non-zero value whereas the
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; lsb is zero.
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; <rdar://problem/15651765>
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; CHECK-LABEL: fastisel_select:
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; CHECK: subb {{%[a-z0-9]+}}, [[RES:%[a-z0-9]+]]
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; CHECK: testb $1, [[RES]]
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; CHECK: cmovnel %edi, %esi
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define i32 @fastisel_select(i1 %exchSub2211_, i1 %trunc_8766) {
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%shuffleInternal15257_8932 = sub i1 %exchSub2211_, %trunc_8766
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%counter_diff1345 = select i1 %shuffleInternal15257_8932, i32 1204476887, i32 0
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ret i32 %counter_diff1345
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}
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