6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-04-07 01:38:26 +00:00
Code Issues Projects Releases Wiki Activity

[mips] Disable tail merging when long branch pass is enabled.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192124 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2013-10-07 19:13:53 +00:00
parent 51a8280fbb
commit c746503425
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/Target/Mips/MipsTargetMachine.cpp
View File

@ -135,7 +135,13 @@ namespace {
class MipsPassConfig : public TargetPassConfig {
public:
MipsPassConfig(MipsTargetMachine *TM, PassManagerBase &PM)
: TargetPassConfig(TM, PM) {}
: TargetPassConfig(TM, PM) {
// The current implementation of long branch pass requires a scratch
// register ($at) to be available before branch instructions. Tail merging
// can break this requirement, so disable it when long branch pass is
// enabled.
EnableTailMerge = !getMipsSubtarget().enableLongBranchPass();
}
MipsTargetMachine &getMipsTargetMachine() const {
return getTM<MipsTargetMachine>();