diff options
| -rw-r--r-- | lib/Target/X86/README-SSE.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt index 624e56fa0f..40110353fc 100644 --- a/lib/Target/X86/README-SSE.txt +++ b/lib/Target/X86/README-SSE.txt @@ -941,3 +941,15 @@ and inversion with an rsqrtss instruction, which computes 1/sqrt faster at the cost of reduced accuracy. //===---------------------------------------------------------------------===// + +This function should be matched to haddpd when the appropriate CPU is enabled: + +#include <x86intrin.h> +double f (__m128d p) { + return p[0] + p[1]; +} + +similarly, v[0]-v[1] should match to hsubpd, and {v[0]-v[1], w[0]-w[1]} should +turn into hsubpd also. + +//===---------------------------------------------------------------------===// |