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Change the definition of TargetRegisterInfo::getCrossCopyRegClass to be more

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flexible.

If it returns a register class that's different from the input, then that's the
register class used for cross-register class copies.
If it returns a register class that's the same as the input, then no cross-
register class copies are needed (normal copies would do).
If it returns null, then it's not at all possible to copy registers of the
specified register class.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127368 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2011-03-09 22:47:38 +00:00
parent 7bff3e7c1b
commit 17adafc6c1
4 changed files with 28 additions and 13 deletions
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6
include/llvm/Target/TargetRegisterInfo.h
View File

@ -588,8 +588,10 @@ public:
}
/// getCrossCopyRegClass - Returns a legal register class to copy a register
/// in the specified class to or from. Returns NULL if it is possible to copy
/// between a two registers of the specified class.
/// in the specified class to or from. If it is possible to copy the register
/// directly without using a cross register class copy, return the specified
/// RC. Returns NULL if it is not possible to copy between a two registers of
/// the specified class.
virtual const TargetRegisterClass *
getCrossCopyRegClass(const TargetRegisterClass *RC) const {
return NULL;

17
lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
View File

@ -570,13 +570,20 @@ void ScheduleDAGFast::ListScheduleBottomUp() {
TRI->getMinimalPhysRegClass(Reg, VT);
const TargetRegisterClass *DestRC = TRI->getCrossCopyRegClass(RC);
// If cross copy register class is null, then it must be possible copy
// the value directly. Do not try duplicate the def.
// If cross copy register class is the same as RC, then it must be
// possible copy the value directly. Do not try duplicate the def.
// If cross copy register class is not the same as RC, then it's
// possible to copy the value but it require cross register class copies
// and it is expensive.
// If cross copy register class is null, then it's not possible to copy
// the value at all.
SUnit *NewDef = 0;
if (DestRC)
if (DestRC != RC) {
NewDef = CopyAndMoveSuccessors(LRDef);
else
DestRC = RC;
if (!DestRC && !NewDef)
report_fatal_error("Can't handle live physical "
"register dependency!");
}
if (!NewDef) {
// Issue copies, these can be expensive cross register class copies.
SmallVector<SUnit*, 2> Copies;

16
lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
View File

@ -1140,13 +1140,19 @@ SUnit *ScheduleDAGRRList::PickNodeToScheduleBottomUp() {
TRI->getMinimalPhysRegClass(Reg, VT);
const TargetRegisterClass *DestRC = TRI->getCrossCopyRegClass(RC);
// If cross copy register class is null, then it must be possible copy
// the value directly. Do not try duplicate the def.
// If cross copy register class is the same as RC, then it must be possible
// copy the value directly. Do not try duplicate the def.
// If cross copy register class is not the same as RC, then it's possible to
// copy the value but it require cross register class copies and it is
// expensive.
// If cross copy register class is null, then it's not possible to copy
// the value at all.
SUnit *NewDef = 0;
if (DestRC)
if (DestRC != RC) {
NewDef = CopyAndMoveSuccessors(LRDef);
else
DestRC = RC;
if (!DestRC && !NewDef)
report_fatal_error("Can't handle live physical register dependency!");
}
if (!NewDef) {
// Issue copies, these can be expensive cross register class copies.
SmallVector<SUnit*, 2> Copies;

2
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -337,7 +337,7 @@ X86RegisterInfo::getCrossCopyRegClass(const TargetRegisterClass *RC) const {
else
return &X86::GR32RegClass;
}
return NULL;
return RC;
}
unsigned