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3 Commits

Author SHA1 Message Date
Dehao Chen cfe5b2bf74 Update the madd.ll test with utils/update_llc_test_checks.py (NFC) 
llvm-svn: 300740
 2017-04-19 20:08:14 +00:00
Dehao Chen 58601674d2 PR32710: Disable using PMADDWD for unsigned short. 
Summary: PMADDWD can only handle signed short.

Reviewers: mkuper, wmi

Reviewed By: mkuper

Subscribers: andreadb, llvm-commits

Differential Revision: https://reviews.llvm.org/D32236

llvm-svn: 300737
 2017-04-19 19:50:34 +00:00
Dehao Chen 58fa724494 Use PMADDWD to expand reduction in a loop 
Summary:
PMADDWD can help improve 8/16 bit integer mutliply-add operation performance for cases like:

for (int i = 0; i < count; i++)
  a += x[i] * y[i];

Reviewers: wmi, davidxl, hfinkel, RKSimon, zvi, mkuper

Reviewed By: mkuper

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D31679

llvm-svn: 299776
 2017-04-07 15:41:52 +00:00