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| author | Simon Dardis <simon.dardis@imgtec.com> | 2016-06-14 13:39:43 +0000 |
|---|---|---|
| committer | Simon Dardis <simon.dardis@imgtec.com> | 2016-06-14 13:39:43 +0000 |
| commit | 878c0b1b76aa5ce8526a50109bd382457eb68ec7 (patch) | |
| tree | bd121d23a5ebb8d11e0c00df1a01dd3e5ba5ae64 /llvm/lib/Target/X86/X86CallFrameOptimization.cpp | |
| parent | 65b6be1d3aaf404075050a7f2a27682e2434737f (diff) | |
| download | bcm5719-llvm-878c0b1b76aa5ce8526a50109bd382457eb68ec7.tar.gz bcm5719-llvm-878c0b1b76aa5ce8526a50109bd382457eb68ec7.zip | |
[mips] Optimize stack pointer adjustments.
Instead of always using addu to adjust the stack pointer when the
size out is of the range of an addiu instruction, use subu so that
a smaller constant can be generated.
This can give savings of ~3 instructions whenever a function has a
a stack frame whose size is out of range of an addiu instruction.
This change may break some naive stack unwinders.
Partially resolves PR/26291.
Thanks to David Chisnall for reporting the issue.
Reviewers: dsanders, vkalintiris
Differential Review: http://reviews.llvm.org/D21321
llvm-svn: 272666
Diffstat (limited to 'llvm/lib/Target/X86/X86CallFrameOptimization.cpp')
0 files changed, 0 insertions, 0 deletions
