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| author | Manman Ren <mren@apple.com> | 2012-05-10 16:48:21 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2012-05-10 16:48:21 +0000 |
| commit | c860887b2d5e6d7f95003678a0e0c60ce57446d8 (patch) | |
| tree | 023077a8d48bfa3e2f87f1c9581294714ec25ed7 /llvm/lib/Transforms/Utils/Local.cpp | |
| parent | 3d90a9ae65cff5c9ac1ef009dcff5179000e1d9d (diff) | |
| download | bcm5719-llvm-c860887b2d5e6d7f95003678a0e0c60ce57446d8.tar.gz bcm5719-llvm-c860887b2d5e6d7f95003678a0e0c60ce57446d8.zip | |
ARM: peephole optimization to remove cmp instruction
This patch will optimize the following cases:
sub r1, r3 | sub r1, imm
cmp r3, r1 or cmp r1, r3 | cmp r1, imm
bge L1
TO
subs r1, r3
bge L1 or ble L1
If the branch instruction can use flag from "sub", then we can replace
"sub" with "subs" and eliminate the "cmp" instruction.
rdar: 10734411
llvm-svn: 156550
Diffstat (limited to 'llvm/lib/Transforms/Utils/Local.cpp')
0 files changed, 0 insertions, 0 deletions
