[AMDGPU][MC] Optimized IsRegIntersect function
Optimized IsRegIntersect by using MCRegAliasIterator
See Bug 33800: https://bugs.llvm.org//show_bug.cgi?id=33800
Reviewers: arsenm, artem.tamazov
Differential Revision: https://reviews.llvm.org/D35452
llvm-svn: 308294
diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
index 26515b2..67ad904 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
@@ -539,23 +539,9 @@
}
bool isRegIntersect(unsigned Reg0, unsigned Reg1, const MCRegisterInfo* TRI) {
-
- if (Reg0 == Reg1) {
- return true;
+ for (MCRegAliasIterator R(Reg0, TRI, true); R.isValid(); ++R) {
+ if (*R == Reg1) return true;
}
-
- unsigned SubReg0 = TRI->getSubReg(Reg0, 1);
- if (SubReg0 == 0) {
- return TRI->getSubRegIndex(Reg1, Reg0) > 0;
- }
-
- for (unsigned Idx = 2; SubReg0 > 0; ++Idx) {
- if (isRegIntersect(Reg1, SubReg0, TRI)) {
- return true;
- }
- SubReg0 = TRI->getSubReg(Reg0, Idx);
- }
-
return false;
}