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alloca, increase the alignment of the load, turning it into an aligned load. This allows us to compile: #include <xmmintrin.h> __m128i foo(__m128i x){ static const unsigned int c_0[4] = { 0, 0, 0, 0 }; __m128i v_Zero = _mm_loadu_si128((__m128i*)c_0); x = _mm_unpacklo_epi8(x, v_Zero); return x; } into: _foo: punpcklbw _c_0.5944, %xmm0 ret .data .lcomm _c_0.5944,16,4 # c_0.5944 instead of: _foo: movdqu _c_0.5944, %xmm1 punpcklbw %xmm1, %xmm0 ret .data .lcomm _c_0.5944,16,2 # c_0.5944 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40971 91177308-0d34-0410-b5e6-96231b3b80d8
15 lines
414 B
LLVM
15 lines
414 B
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {GLOBAL.*align 16}
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {tmp = load}
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@GLOBAL = internal constant [4 x i32] zeroinitializer
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declare <16 x i8> @llvm.x86.sse2.loadu.dq(i8*)
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define <16 x i8> @foo(<2 x i64> %x) {
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entry:
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%tmp = tail call <16 x i8> @llvm.x86.sse2.loadu.dq( i8* bitcast ([4 x i32]* @GLOBAL to i8*) )
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ret <16 x i8> %tmp
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}
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