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llvm-6502/test/Transforms/InstCombine/load2.ll

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Transform a load from an undef/zero global into an undef/global even if we have complex pointer manipulation going on. This allows us to compile stuff like this: __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: xorps %xmm1, %xmm1 punpcklbw %xmm1, %xmm0 ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41022 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-11 18:48:48 +00:00
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep load
@GLOBAL = internal constant [4 x i32] zeroinitializer
define <16 x i8> @foo(<2 x i64> %x) {
entry:
%tmp = load <16 x i8> * bitcast ([4 x i32]* @GLOBAL to <16 x i8>*)
ret <16 x i8> %tmp
}
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