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

; 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
}
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 llvm-svn: 41022 2007-08-11 20:48:48 +02:00			`; 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`
			`}`