[CodeGen][ShrinkWrap] Split restore point

This patch splits a restore point to allow it to only post-dominate blocks reachable by use or def of CSRs(Callee Saved Registers)/FI(Frame Index). Benchmarking this on SPEC2017, this gives around 4% improvement on povray and no significant change for others. Co-authored-by: junbuml Differential Revision: https://reviews.llvm.org/D42600
llvm · Apr 11, 2023 · 5f0bccc · 5f0bccc
1 parent 437dfa5
commit 5f0bccc
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diff --git a/llvm/lib/CodeGen/ShrinkWrap.cpp b/llvm/lib/CodeGen/ShrinkWrap.cpp
diff --git a/llvm/test/CodeGen/AArch64/dont-shrink-wrap-stack-mayloadorstore.mir b/llvm/test/CodeGen/AArch64/dont-shrink-wrap-stack-mayloadorstore.mir
@@ -6,8 +6,8 @@
  ; RUN: llc -x=mir -simplify-mir -run-pass=shrink-wrap -o - %s | FileCheck %s
  ; CHECK:      name:            compiler_pop_stack
  ; CHECK:      frameInfo:       
- ; CHECK-NOT:  savePoint:
- ; CHECK-NOT:  restorePoint:
+ ; CHECK:      savePoint:       '%bb.1'
+ ; CHECK-NEXT: restorePoint:    '%bb.7'
  ; CHECK:      stack:
  ; CHECK:      name:            f
  ; CHECK:      frameInfo: