llvm/lib at cae1ea691d79ce786e9209cb5917036f42f13d7c - llvm

RPCS3/llvm

mirror of https://github.com/RPCS3/llvm.git synced 2025-01-23 02:44:32 +00:00

History

Andrea Di Biagio cae1ea691d [X86] Always prefer to lower a VECTOR_SHUFFLE into a BLENDI instead of SHUFP (or VPERM2X128).

This patch teaches method 'LowerVECTOR_SHUFFLE' to give higher precedence to
the check for 'isBlendMask'; the idea is that, when possible, we should firstly
check if a shuffle performs a blend, and in case, try to lower it into a BLENDI
instead of selecting a SHUFP or (worse) a VPERM2X128.

In general:
 - AVX VBLENDPS/D always have better latency and throughput than VPERM2F128;
 - BLENDPS/D instructions tend to always have better 'reciprocal throughput'
   than the equivalent SHUFPS/D;
 - Both BLENDPS/D and SHUFPS/D are often decoded into the same number of
   m-ops; however, a m-op obtained from a BLENDPS/D can be scheduled to more
   than one execution port.

This patch:
 - Moves the check for 'isBlendMask' immediately before the check for
   'isSHUFPMask' within method 'LowerVECTOR_SHUFFLE';
 - Updates existing tests for sse/avx shuffle/blend instructions to verify
   that we select (v)blendps/d when possible (instead of (v)shufps/d or
   vperm2f128).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211720 91177308-0d34-0410-b5e6-96231b3b80d8

2014-06-25 17:41:58 +00:00

Analysis

Support: Move class ScaledNumber

2014-06-24 00:38:09 +00:00

AsmParser

Rename loop unrolling and loop vectorizer metadata to have a common prefix.

2014-06-25 15:41:00 +00:00

Bitcode

Rename loop unrolling and loop vectorizer metadata to have a common prefix.

2014-06-25 15:41:00 +00:00

CodeGen

Re-apply r211399, "Generate native unwind info on Win64" with a fix to ignore SEH pseudo ops in X86 JIT emitter.