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AMDGPU: Restore using MRI to find highest used regs

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If there are no calls, this is a faster path than
searching the entire program for calls.

This was supposed to be left in r309781.
Fixes unused variable warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309832 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2017-08-02 17:15:01 +00:00
parent 810c1b6a3c
commit 981b5410cc
1 changed files with 24 additions and 6 deletions
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20
lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
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@ -500,7 +500,7 @@ AMDGPUAsmPrinter::SIFunctionResourceInfo AMDGPUAsmPrinter::analyzeResourceUsage(
// If there are no calls, MachineRegisterInfo can tell us the used register
// count easily.
if (!FrameInfo.hasCalls()) {
MCPhysReg HighestVGPRReg = AMDGPU::NoRegister;
for (MCPhysReg Reg : reverse(AMDGPU::VGPR_32RegClass.getRegisters())) {
if (MRI.isPhysRegUsed(Reg)) {
@ -509,6 +509,24 @@ AMDGPUAsmPrinter::SIFunctionResourceInfo AMDGPUAsmPrinter::analyzeResourceUsage(
}
}
MCPhysReg HighestSGPRReg = AMDGPU::NoRegister;
for (MCPhysReg Reg : reverse(AMDGPU::SGPR_32RegClass.getRegisters())) {
if (MRI.isPhysRegUsed(Reg)) {
HighestSGPRReg = Reg;
break;
}
}
// We found the maximum register index. They start at 0, so add one to get the
// number of registers.
Info.NumVGPR = HighestVGPRReg == AMDGPU::NoRegister ? 0 :
TRI.getHWRegIndex(HighestVGPRReg) + 1;
Info.NumExplicitSGPR = HighestSGPRReg == AMDGPU::NoRegister ? 0 :
TRI.getHWRegIndex(HighestSGPRReg) + 1;
return Info;
}
int32_t MaxVGPR = -1;
int32_t MaxSGPR = -1;
uint32_t CalleeFrameSize = 0;