diff options
| -rw-r--r-- | lib/Target/X86/README-SSE.txt | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt index 85cdd17781..f96b22f1e2 100644 --- a/lib/Target/X86/README-SSE.txt +++ b/lib/Target/X86/README-SSE.txt @@ -19,6 +19,32 @@ __m128i shift_right(__m128i value, unsigned long offset) { //===---------------------------------------------------------------------===// +SSE has instructions for doing operations on complex numbers, we should pattern +match them. Compiling this: + +_Complex float f32(_Complex float A, _Complex float B) { + return A+B; +} + +into: + +_f32: + movdqa %xmm0, %xmm2 + addss %xmm1, %xmm2 + pshufd $16, %xmm2, %xmm2 + pshufd $1, %xmm1, %xmm1 + pshufd $1, %xmm0, %xmm0 + addss %xmm1, %xmm0 + pshufd $16, %xmm0, %xmm1 + movdqa %xmm2, %xmm0 + unpcklps %xmm1, %xmm0 + ret + +seems silly. + + +//===---------------------------------------------------------------------===// + Expand libm rounding functions inline: Significant speedups possible. http://gcc.gnu.org/ml/gcc-patches/2006-10/msg00909.html |