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MachineRegisterInfo: Remove UsedPhysReg infrastructure

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We have a detailed def/use lists for every physical register in
MachineRegisterInfo anyway, so there is little use in maintaining an
additional bitset of which ones are used.

Removing it frees us from extra book keeping. This simplifies
VirtRegMap.

Differential Revision: http://reviews.llvm.org/D10911

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242173 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-07-14 17:52:07 +00:00
parent 230c4739b3
commit 2addf067a2
18 changed files with 23 additions and 179 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
lib/Target/Sparc/SparcFrameLowering.cpp
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@@ -190,11 +190,11 @@ static bool LLVM_ATTRIBUTE_UNUSED verifyLeafProcRegUse(MachineRegisterInfo *MRI)
{
for (unsigned reg = SP::I0; reg <= SP::I7; ++reg)
if (MRI->isPhysRegUsed(reg))
if (!MRI->reg_nodbg_empty(reg))
return false;
for (unsigned reg = SP::L0; reg <= SP::L7; ++reg)
if (MRI->isPhysRegUsed(reg))
if (!MRI->reg_nodbg_empty(reg))
return false;
return true;
@@ -206,10 +206,10 @@ bool SparcFrameLowering::isLeafProc(MachineFunction &MF) const
MachineRegisterInfo &MRI = MF.getRegInfo();
MachineFrameInfo *MFI = MF.getFrameInfo();
return !(MFI->hasCalls() // has calls
|| MRI.isPhysRegUsed(SP::L0) // Too many registers needed
|| MRI.isPhysRegUsed(SP::O6) // %SP is used
|| hasFP(MF)); // need %FP
return !(MFI->hasCalls() // has calls
|| !MRI.reg_nodbg_empty(SP::L0) // Too many registers needed
|| !MRI.reg_nodbg_empty(SP::O6) // %SP is used
|| hasFP(MF)); // need %FP
}
void SparcFrameLowering::remapRegsForLeafProc(MachineFunction &MF) const {
@@ -218,16 +218,13 @@ void SparcFrameLowering::remapRegsForLeafProc(MachineFunction &MF) const {
// Remap %i[0-7] to %o[0-7].
for (unsigned reg = SP::I0; reg <= SP::I7; ++reg) {
if (!MRI.isPhysRegUsed(reg))
if (MRI.reg_nodbg_empty(reg))
continue;
unsigned mapped_reg = (reg - SP::I0 + SP::O0);
assert(!MRI.isPhysRegUsed(mapped_reg));
assert(MRI.reg_nodbg_empty(mapped_reg));
// Replace I register with O register.
MRI.replaceRegWith(reg, mapped_reg);
// Mark the reg unused.
MRI.setPhysRegUnused(reg);
}
// Rewrite MBB's Live-ins.