diff options
Diffstat (limited to 'lib/Target/SystemZ/SystemZTargetMachine.cpp')
| -rw-r--r-- | lib/Target/SystemZ/SystemZTargetMachine.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Target/SystemZ/SystemZTargetMachine.cpp b/lib/Target/SystemZ/SystemZTargetMachine.cpp index 2bacc2bc24..856183c6f4 100644 --- a/lib/Target/SystemZ/SystemZTargetMachine.cpp +++ b/lib/Target/SystemZ/SystemZTargetMachine.cpp @@ -82,6 +82,9 @@ bool SystemZPassConfig::addPreEmitPass() { // CC values (while still being worthwhile) and others that happen to make // the CC result more useful than it was originally. // + // Another reason is that we only want to use BRANCH ON COUNT in cases + // where we know that the count register is not going to be spilled. + // // Doing it so late makes it more likely that a register will be reused // between the comparison and the branch, but it isn't clear whether // preventing that would be a win or not. |