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void test(long long *P) { *P ^= 1; } into just: _test: movl 4(%esp), %eax xorl $1, (%eax) ret instead of code like this: _test: movl 4(%esp), %ecx xorl $1, (%ecx) movl 4(%ecx), %edx movl %edx, 4(%ecx) ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45762 91177308-0d34-0410-b5e6-96231b3b80d8
12 lines
301 B
LLVM
12 lines
301 B
LLVM
; RUN: llvm-as < %s | llc -march=x86 | not grep '4{(%...)}
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; This should not load or store the top part of *P.
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define void @test(i64* %P) nounwind {
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entry:
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%tmp1 = load i64* %P, align 8 ; <i64> [#uses=1]
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%tmp2 = xor i64 %tmp1, 1 ; <i64> [#uses=1]
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store i64 %tmp2, i64* %P, align 8
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ret void
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}
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