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| author | Roman Lebedev <lebedev.ri@gmail.com> | 2019-05-28 20:39:55 +0000 |
|---|---|---|
| committer | Roman Lebedev <lebedev.ri@gmail.com> | 2019-05-28 20:39:55 +0000 |
| commit | 96c9986199f18909742076837604b1b8f0e88639 (patch) | |
| tree | 12e8978288903a216e990944fc51cb337bf81a72 /llvm/lib/Support/regfree.c | |
| parent | 2feb7e56e2872d0ea55f9cf8fd1a46f2a08b81ea (diff) | |
| download | bcm5719-llvm-96c9986199f18909742076837604b1b8f0e88639.tar.gz bcm5719-llvm-96c9986199f18909742076837604b1b8f0e88639.zip | |
[DAGCombiner][X86][AArch64][SPARC][SystemZ] y - (x + C) -> (y - x) - C fold. Try 2
Summary:
Direct sibling of D62223 patch.
While i don't have a direct motivational pattern for this,
it would seem to make sense to handle both patterns (or none),
for symmetry?
The aarch64 changes look neutral;
sparc and systemz look like improvement (one less instruction each);
x86 changes - 32bit case improves, 64bit case shows that LEA no longer
gets constructed, which may be because that whole test is `-mattr=+slow-lea,+slow-3ops-lea`
https://rise4fun.com/Alive/ffh
This is a recommit, originally committed in rL361853, but reverted
to investigate test-suite compile-time hangs.
Reviewers: RKSimon, craig.topper, spatel, t.p.northover
Reviewed By: t.p.northover
Subscribers: t.p.northover, jyknight, javed.absar, kristof.beyls, fedor.sergeev, jrtc27, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D62252
llvm-svn: 361872
Diffstat (limited to 'llvm/lib/Support/regfree.c')
0 files changed, 0 insertions, 0 deletions
