51f48295cb
Patch https://reviews.llvm.org/D43256 introduced more aggressive loop layout optimization which depends on profile information. If profile information is not available, the statically estimated profile information(generated by BranchProbabilityInfo.cpp) is used. If user program doesn't behave as BranchProbabilityInfo.cpp expected, the layout may be worse. To be conservative this patch restores the original layout algorithm in plain mode. But user can still try the aggressive layout optimization with -force-precise-rotation-cost=true. Differential Revision: https://reviews.llvm.org/D65673 llvm-svn: 369664
19 lines
495 B
LLVM
19 lines
495 B
LLVM
; RUN: llc < %s -mtriple=armv7-apple-darwin -verify-machineinstrs | FileCheck %s -check-prefix=ARM
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; RUN: llc < %s -mtriple=thumbv7-apple-darwin -verify-machineinstrs | FileCheck %s -check-prefix=T2
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; rdar://8964854
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define i8 @t(i8* %a, i8 %b, i8 %c) nounwind {
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; ARM-LABEL: t:
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; ARM: ldrexb
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; ARM: strexb
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; ARM: clrex
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; T2-LABEL: t:
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; T2: strexb
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; T2: ldrexb
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; T2: clrex
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%tmp0 = cmpxchg i8* %a, i8 %b, i8 %c monotonic monotonic
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%tmp1 = extractvalue { i8, i1 } %tmp0, 0
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ret i8 %tmp1
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}
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