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| author | Dan Gohman <gohman@apple.com> | 2008-12-03 05:21:24 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-12-03 05:21:24 +0000 |
| commit | 62c939d7d5572e57963a5f26fb6fe802e13dc0bf (patch) | |
| tree | 40550321fe3caaaa7a081dc7d7ce4faa4339e234 /lib/Transforms/Utils/BasicBlockUtils.cpp | |
| parent | b3cf03cee1ce45a0b774bc8a8057ff7931a53215 (diff) | |
Mark x86's V_SET0 and V_SETALLONES with isSimpleLoad, and teach X86's
foldMemoryOperand how to "fold" them, by converting them into constant-pool
loads. When they aren't folded, they use xorps/cmpeqd, but for example when
register pressure is high, they may now be folded as memory operands, which
reduces register pressure.
Also, mark V_SET0 isAsCheapAsAMove so that two-address-elimination will
remat it instead of copying zeros around (V_SETALLONES was already marked).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60461 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils/BasicBlockUtils.cpp')
0 files changed, 0 insertions, 0 deletions