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5c5681cf27
In this patch we optimize this pattern and convert the sequence into extract op of a narrow type. This allows the BUILD_VECTOR dag optimizations to construct efficient shuffle operations in many cases. llvm-svn: 149692
16 lines
393 B
LLVM
16 lines
393 B
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 | FileCheck %s
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; Make sure that the conversion between v4i8 to v2i16 is not a simple bitcast.
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; CHECK: prom_bug
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; CHECK: shufb
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; CHECK: movd
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; CHECK: movw
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; CHECK: ret
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define void @prom_bug(<4 x i8> %t, i16* %p) {
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%r = bitcast <4 x i8> %t to <2 x i16>
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%o = extractelement <2 x i16> %r, i32 0
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store i16 %o, i16* %p
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ret void
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}
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