[PATCH] D38730: X86: Fix X86CallFrameOptimization to search for the COPY StackPointer
Zvi Rackover via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 10 06:57:59 PDT 2017
zvi created this revision.
SelectionDAG inserts a copy of ESP into a virtual register.
X86CallFrameOptimization assumed that the COPY, if present, is always
right after the call-frame setup instruction (ADJCALLSTACKDOWN). This was a
wrong assumption as the COPY can be located anywhere between the call-frame setup
instruction and its first use. If the COPY happened to be located in a different
location than what X86CallFrameOptimization assumed, visiting it while
processing the call chain would lead to a conservative bail-out.
The fix is quite straightfoward, scan ahead for the stack-pointer copy and make note
of it so it can be ignored while processing the call chain.
Fixes pr34903
https://reviews.llvm.org/D38730
Files:
lib/Target/X86/X86CallFrameOptimization.cpp
test/CodeGen/X86/cmpxchg-clobber-flags.ll
test/CodeGen/X86/movtopush.ll
test/CodeGen/X86/movtopush.mir
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