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5 Commits

Author SHA1 Message Date
Craig Topper f6df4a6978 [AVX-512] Remove duplicate CodeGenOnly patterns for scalar register broadcast. We can use COPY_TO_REGCLASS like AVX does. 
This causes stack spill slots be oversized sometimes, but the same should already be happening with AVX.

llvm-svn: 293464
 2017-01-30 06:59:06 +00:00
Craig Topper fa875a1d3d [AVX-512] Teach EVEX to VEX conversion pass to handle VINSERT and VEXTRACT instructions. 
llvm-svn: 290869
 2017-01-03 05:46:18 +00:00
Craig Topper be9ef55152 [X86] Remove trailing whitespace and an unnecessary line wrap. NFC 
llvm-svn: 290867
 2017-01-03 05:46:06 +00:00
Craig Topper 06bae884bd [X86] Fix header comment. NFC 
llvm-svn: 290866
 2017-01-03 05:46:05 +00:00
Gadi Haber 19c4fc5e62 This is a large patch for X86 AVX-512 of an optimization for reducing code size by encoding EVEX AVX-512 instructions using the shorter VEX encoding when possible. 
There are cases of AVX-512 instructions that have two possible encodings. This is the case with instructions that use vector registers with low indexes of 0 - 15 and do not use the zmm registers or the mask k registers.
The EVEX encoding prefix requires 4 bytes whereas the VEX prefix can take only up to 3 bytes. Consequently, using the VEX encoding for these instructions results in a code size reduction of ~2 bytes even though it is compiled with the AVX-512 features enabled.

Reviewers: Craig Topper, Zvi Rackoover, Elena Demikhovsky 
Differential Revision: https://reviews.llvm.org/D27901

llvm-svn: 290663
 2016-12-28 10:12:48 +00:00