RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-01-31 12:41:49 +01:00
Code Issues Projects Releases Wiki Activity

[PowerPC] Remove unnecessary XSRSP instruction

Browse Source 
MI peephole will remove unnecessary FRSP instructions. This patch
removes such unnecessary XSRSP.

Reviewed By: steven.zhang

Differential Revision: https://reviews.llvm.org/D77208
This commit is contained in:
Qiu Chaofan 2020-04-03 11:05:14 +08:00
parent 4b82ef3815
commit 22d4391a3c
2 changed files with 7 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
lib/Target/PowerPC/PPCMIPeephole.cpp
View File

@ -541,10 +541,12 @@ bool PPCMIPeephole::simplifyCode(void) {
if (!P1 || !P2)
break;
// Remove the passed FRSP instruction if it only feeds this MI and
// set any uses of that FRSP (in this MI) to the source of the FRSP.
// Remove the passed FRSP/XSRSP instruction if it only feeds this MI
// and set any uses of that FRSP/XSRSP (in this MI) to the source of
// the FRSP/XSRSP.
auto removeFRSPIfPossible = [&](MachineInstr *RoundInstr) {
if (RoundInstr->getOpcode() == PPC::FRSP &&
unsigned Opc = RoundInstr->getOpcode();
if ((Opc == PPC::FRSP || Opc == PPC::XSRSP) &&
MRI->hasOneNonDBGUse(RoundInstr->getOperand(0).getReg())) {
Simplified = true;
Register ConvReg1 = RoundInstr->getOperand(1).getReg();
@ -554,7 +556,7 @@ bool PPCMIPeephole::simplifyCode(void) {
if (Use.getOperand(i).isReg() &&
Use.getOperand(i).getReg() == FRSPDefines)
Use.getOperand(i).setReg(ConvReg1);
LLVM_DEBUG(dbgs() << "Removing redundant FRSP:\n");
LLVM_DEBUG(dbgs() << "Removing redundant FRSP/XSRSP:\n");
LLVM_DEBUG(RoundInstr->dump());
LLVM_DEBUG(dbgs() << "As it feeds instruction:\n");
LLVM_DEBUG(MI.dump());

2
test/CodeGen/PowerPC/mi-simplify-code.mir
View File

@ -56,7 +56,7 @@ body: |
# CHECK-LABEL: remove_xsrsp
# CHECK: sldi 4, 4, 2
# CHECK-NEXT: lfsux 0, 3, 4
# CHECK-NEXT: xsrsp 0, 0
# CHECK-NOT: xsrsp
# CHECK-NEXT: lfs 1, 8(3)
# CHECK-NEXT: xxmrghd 0, 1, 0
# CHECK-NEXT: xvcvdpsp 34, 0