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8b944d39b3
e.g. orl $65536, 8(%rax) => orb $1, 10(%rax) Since narrowing is not always a win, e.g. i32 -> i16 is a loss on x86, dag combiner consults with the target before performing the optimization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72507 91177308-0d34-0410-b5e6-96231b3b80d8
24 lines
724 B
LLVM
24 lines
724 B
LLVM
; RUN: llvm-as < %s | llc -march=x86-64 | grep andb | count 2
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; RUN: llvm-as < %s | llc -march=x86-64 | grep andb | grep 254
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; RUN: llvm-as < %s | llc -march=x86-64 | grep andb | grep 253
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%struct.bf = type { i64, i16, i16, i32 }
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@bfi = external global %struct.bf*
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define void @t1() nounwind ssp {
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entry:
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%0 = load %struct.bf** @bfi, align 8
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%1 = getelementptr %struct.bf* %0, i64 0, i32 1
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%2 = bitcast i16* %1 to i32*
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%3 = load i32* %2, align 1
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%4 = and i32 %3, -65537
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store i32 %4, i32* %2, align 1
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%5 = load %struct.bf** @bfi, align 8
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%6 = getelementptr %struct.bf* %5, i64 0, i32 1
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%7 = bitcast i16* %6 to i32*
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%8 = load i32* %7, align 1
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%9 = and i32 %8, -131073
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store i32 %9, i32* %7, align 1
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ret void
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}
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