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--corrected coalescing test: coalsed only if two are of the same reg class 

llvm-svn: 729
This commit is contained in:
Ruchira Sasanka 2001-10-12 17:48:18 +00:00
parent 04009efe48
commit 7c10e086eb
1 changed files with 6 additions and 6 deletions
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12
llvm/lib/CodeGen/RegAlloc/LiveRangeInfo.cpp
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@ -110,6 +110,7 @@ void LiveRangeInfo::constructLiveRanges()
// Now if the machine instruction has special operands that must be
// set with a "suggested color", do it here.
// This will be true for call/return instructions
if( MRI.handleSpecialMInstr(MInst, *this, RegClassList) )
@ -254,7 +255,7 @@ void LiveRangeInfo::coalesceLRs()
for each machine instruction (inst)
for each definition (def) in inst
for each operand (op) of inst that is a use
if the def and op are of the same type
if the def and op are of the same register class
if the def and op do not interfere //i.e., not simultaneously live
if (degree(LR of def) + degree(LR of op)) <= # avail regs
if both LRs do not have suggested colors
@ -313,12 +314,11 @@ void LiveRangeInfo::coalesceLRs()
if( LROfUse == LROfDef) // nothing to merge if they are same
continue;
// RegClass *const RCOfUse = LROfUse->getRegClass();
RegClass *const RCOfUse = LROfUse->getRegClass();
//if( RCOfDef == RCOfUse ) { // if the reg classes are the same
if( RCOfDef == RCOfUse ) { // if the reg classes are the same
if( LROfUse->getTypeID() == LROfDef->getTypeID() ) {
// if( LROfUse->getTypeID() == LROfDef->getTypeID() ) {
if( ! RCOfDef->getInterference(LROfDef, LROfUse) ) {
@ -341,7 +341,7 @@ void LiveRangeInfo::coalesceLRs()
} // if def and use do not interfere
} // if reg classes are the same
}// if reg classes are the same
} // for all uses