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| -rw-r--r-- | lib/Target/X86/README-SSE.txt | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt index ecf846c281..5b741e6f7a 100644 --- a/lib/Target/X86/README-SSE.txt +++ b/lib/Target/X86/README-SSE.txt @@ -664,3 +664,32 @@ e.g. SSE select using and, andnot, or. Various SSE compare translations. //===---------------------------------------------------------------------===// Add hooks to commute some CMPP operations. + +//===---------------------------------------------------------------------===// + +Implement some missing insert/extract element operations without going through +the stack. Testcase here: +CodeGen/X86/vec_ins_extract.ll +corresponds to this C code: + +typedef float vectorfloat __attribute__((vector_size(16))); +void test(vectorfloat *F, float f) { + vectorfloat G = *F + *F; + *((float*)&G) = f; + *F = G + G; +} +void test2(vectorfloat *F, float f) { + vectorfloat G = *F + *F; + ((float*)&G)[2] = f; + *F = G + G; +} +void test3(vectorfloat *F, float *f) { + vectorfloat G = *F + *F; + *f = ((float*)&G)[2]; +} +void test4(vectorfloat *F, float *f) { + vectorfloat G = *F + *F; + *f = *((float*)&G); +} + +//===---------------------------------------------------------------------===// |