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6 Commits

Author SHA1 Message Date
Elena Demikhovsky 519b4ccd70 Fixed FMA + FNEG combine. 
Masked form of FMA should be omitted in this optimization.

Differential Revision: https://reviews.llvm.org/D25984

llvm-svn: 285492
 2016-10-29 08:44:46 +00:00
Elena Demikhovsky f0ddd1b8b5 AVX512F: FMA intrinsic + FNEG - sequence optimization 
The previous commit (r280368 - https://reviews.llvm.org/D23313) does not cover AVX-512F, KNL set.
FNEG(x) operation is lowered to (bitcast (vpxor (bitcast x), (bitcast constfp(0x80000000))).
It happens because FP XOR is not supported for 512-bit data types on KNL and we use integer XOR instead.
I added pattern match for integer XOR.

Differential Revision: https://reviews.llvm.org/D24221

llvm-svn: 280785
 2016-09-07 06:54:28 +00:00
Elena Demikhovsky 4d7738dfde Optimized FMA intrinsic + FNEG , like 
-(a*b+c)

and FNEG + FMA, like
a*b-c or (-a)*b+c.

The bug description is here :  https://llvm.org/bugs/show_bug.cgi?id=28892

Differential revision: https://reviews.llvm.org/D23313

llvm-svn: 280368
 2016-09-01 13:58:53 +00:00
Craig Topper 713085e60a [X86] Don't lower FABS/FNEG masking directly to a ConstantPool load. Just create a ConstantFPSDNode and let that be lowered. 
This allows broadcast loads to used when available.

llvm-svn: 279958
 2016-08-29 04:49:31 +00:00
Vyacheslav Klochkov 6daefcf626 X86-FMA3: Implemented commute transformation for EVEX/AVX512 FMA3 opcodes. 
This helped to improved memory-folding and register coalescing optimizations.

Also, this patch fixed the tracker #17229.

Reviewer: Craig Topper.
Differential Revision: https://reviews.llvm.org/D23108

llvm-svn: 278431
 2016-08-11 22:07:33 +00:00
Elena Demikhovsky 0e0e07f436 AVX-512: A new test for FMA intrinsic 
A new test that explores sub-optimal sequence of FMA intrinsic and FNEG operation.
An upcoming patch will fix it.

llvm-svn: 278117
 2016-08-09 11:54:14 +00:00