diff options
| author | Bill Wendling <isanbard@gmail.com> | 2007-10-25 18:23:45 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2007-10-25 18:23:45 +0000 |
| commit | 5f7ed00d4490cc3811e20c5dc3051e81b2d34601 (patch) | |
| tree | c5a808cc18b9f3d5821fd0700596baa876f4294a /llvm/lib/CodeGen/BranchFolding.cpp | |
| parent | 0cf94e9c91565c1ab9f4232958309556f9819ee8 (diff) | |
| download | bcm5719-llvm-5f7ed00d4490cc3811e20c5dc3051e81b2d34601.tar.gz bcm5719-llvm-5f7ed00d4490cc3811e20c5dc3051e81b2d34601.zip | |
Added comment explaining why we are doing this check.
llvm-svn: 43353
Diffstat (limited to 'llvm/lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/BranchFolding.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp index d523bf585ae..021001d15fc 100644 --- a/llvm/lib/CodeGen/BranchFolding.cpp +++ b/llvm/lib/CodeGen/BranchFolding.cpp @@ -272,6 +272,11 @@ static unsigned ComputeCommonTailLength(MachineBasicBlock *MBB1, while (I1 != MBB1->begin() && I2 != MBB2->begin()) { --I1; --I2; if (!I1->isIdenticalTo(I2) || + // XXX: This check is dubious. It's used to get around a problem where + // people incorrectly expect inline asm directives to remain in the same + // relative order. This is untenable because normal compiler + // optimizations (like this one) may reorder and/or merge these + // directives. I1->getOpcode() == TargetInstrInfo::INLINEASM) { ++I1; ++I2; break; |
