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4 Commits

Author SHA1 Message Date
Dehao Chen 65dd23e273 Add LiveRangeShrink pass to shrink live range within BB. 
Summary: LiveRangeShrink pass moves instruction right after the definition with the same BB if the instruction and its operands all have more than one use. This pass is inexpensive and guarantees optimal live-range within BB.

Reviewers: davidxl, wmi, hfinkel, MatzeB, andreadb

Reviewed By: MatzeB, andreadb

Subscribers: hiraditya, jyknight, sanjoy, skatkov, gberry, jholewinski, qcolombet, javed.absar, krytarowski, atrick, spatel, RKSimon, andreadb, MatzeB, mehdi_amini, mgorny, efriedma, davide, dberlin, llvm-commits

Differential Revision: https://reviews.llvm.org/D32563

llvm-svn: 302938
 2017-05-12 19:29:27 +00:00
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