derek.holloway
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31 lines
1.1 KiB
LLVM
31 lines
1.1 KiB
LLVM
; RUN: opt < %s -passes=instcombine -S | grep "align 32" | count 2
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; It's tempting to have an instcombine in which the src pointer of a
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; memcpy is aligned up to the alignment of the destination, however
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; there are pitfalls. If the src is an alloca, aligning it beyond what
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; the target's stack pointer is aligned at will require dynamic
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; stack realignment, which can require functions that don't otherwise
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; need a frame pointer to need one.
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;
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; Abstaining from this transform is not the only way to approach this
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; issue. Some late phase could be smart enough to reduce alloca
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; alignments when they are greater than they need to be. Or, codegen
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; could do dynamic alignment for just the one alloca, and leave the
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; main stack pointer at its standard alignment.
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;
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@dst = global [1024 x i8] zeroinitializer, align 32
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define void @foo() nounwind {
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entry:
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%src = alloca [1024 x i8], align 64
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call void @llvm.memcpy.p0.p0.i32(ptr align 32 @dst, ptr align 32 %src, i32 1024, i1 false)
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call void @frob(ptr %src) nounwind
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ret void
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}
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declare void @frob(ptr)
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declare void @llvm.memcpy.p0.p0.i32(ptr nocapture, ptr nocapture, i32, i1) nounwind
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