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authorJakob Stoklund Olesen <stoklund@2pi.dk>2012-02-13 18:17:04 +0000
committerJakob Stoklund Olesen <stoklund@2pi.dk>2012-02-13 18:17:04 +0000
commit6f8fe71216be0af3faa9afc0fcbb81aa76a80b11 (patch)
tree9427855d7aabbacc2f4b517460d10c3b6bcc275d /llvm/lib
parent636d2832023ea03680618259ed2bd6600e42c01a (diff)
downloadbcm5719-llvm-6f8fe71216be0af3faa9afc0fcbb81aa76a80b11.tar.gz
bcm5719-llvm-6f8fe71216be0af3faa9afc0fcbb81aa76a80b11.zip
Check regmask interference for -join-physregs.
llvm-svn: 150404
Diffstat (limited to 'llvm/lib')
-rw-r--r--llvm/lib/CodeGen/RegisterCoalescer.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/RegisterCoalescer.cpp b/llvm/lib/CodeGen/RegisterCoalescer.cpp
index 2144137e634..61dcec2eab9 100644
--- a/llvm/lib/CodeGen/RegisterCoalescer.cpp
+++ b/llvm/lib/CodeGen/RegisterCoalescer.cpp
@@ -1426,6 +1426,14 @@ bool RegisterCoalescer::JoinIntervals(CoalescerPair &CP) {
return true;
}
+ // Check if a register mask clobbers DstReg.
+ BitVector UsableRegs;
+ if (LIS->checkRegMaskInterference(RHS, UsableRegs) &&
+ !UsableRegs.test(CP.getDstReg())) {
+ DEBUG(dbgs() << "\t\tRegister mask interference.\n");
+ return false;
+ }
+
for (const unsigned *AS = TRI->getAliasSet(CP.getDstReg()); *AS; ++AS){
if (!LIS->hasInterval(*AS))
continue;
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