[PowerPC] [PowerPC] Enhance the fast selection of fptoi & fptrunc instruction and clean up related asserts
Summary:
Fast selection of llvm fptoi & fptrunc instructions is not handled well about
VSX instruction support.
We'd use VSX float convert integer instruction instead of non-vsx float convert
integer instruction if the operand register class is VSSRC or VSFRC because i32
and i64 are mapped to VSSRC and VSFRC correspondingly if VSX feature is
openeded.
For float trunc instruction, we do this silimar work like float convert integer
instruction to try to use VSX instruction.
Reviewed By: jsji
Differential Revision: https://reviews.llvm.org/D58430
llvm-svn: 354762
diff --git a/llvm/lib/Target/PowerPC/PPCFastISel.cpp b/llvm/lib/Target/PowerPC/PPCFastISel.cpp
index 14a72bd..e22e682 100644
--- a/llvm/lib/Target/PowerPC/PPCFastISel.cpp
+++ b/llvm/lib/Target/PowerPC/PPCFastISel.cpp
@@ -987,12 +987,17 @@
// Round the result to single precision.
unsigned DestReg;
-
+ auto RC = MRI.getRegClass(SrcReg);
if (PPCSubTarget->hasSPE()) {
DestReg = createResultReg(&PPC::SPE4RCRegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
TII.get(PPC::EFSCFD), DestReg)
.addReg(SrcReg);
+ } else if (isVSFRCRegClass(RC)) {
+ DestReg = createResultReg(&PPC::VSSRCRegClass);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
+ TII.get(PPC::XSRSP), DestReg)
+ .addReg(SrcReg);
} else {
DestReg = createResultReg(&PPC::F4RCRegClass);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
@@ -1207,16 +1212,19 @@
if (SrcReg == 0)
return false;
- // Convert f32 to f64 if necessary. This is just a meaningless copy
- // to get the register class right.
+ // Convert f32 to f64 or convert VSSRC to VSFRC if necessary. This is just a
+ // meaningless copy to get the register class right.
const TargetRegisterClass *InRC = MRI.getRegClass(SrcReg);
if (InRC == &PPC::F4RCRegClass)
SrcReg = copyRegToRegClass(&PPC::F8RCRegClass, SrcReg);
+ else if (InRC == &PPC::VSSRCRegClass)
+ SrcReg = copyRegToRegClass(&PPC::VSFRCRegClass, SrcReg);
// Determine the opcode for the conversion, which takes place
- // entirely within FPRs.
+ // entirely within FPRs or VSRs.
unsigned DestReg;
unsigned Opc;
+ auto RC = MRI.getRegClass(SrcReg);
if (PPCSubTarget->hasSPE()) {
DestReg = createResultReg(&PPC::GPRCRegClass);
@@ -1224,6 +1232,12 @@
Opc = InRC == &PPC::SPE4RCRegClass ? PPC::EFSCTSIZ : PPC::EFDCTSIZ;
else
Opc = InRC == &PPC::SPE4RCRegClass ? PPC::EFSCTUIZ : PPC::EFDCTUIZ;
+ } else if (isVSFRCRegClass(RC)) {
+ DestReg = createResultReg(&PPC::VSFRCRegClass);
+ if (DstVT == MVT::i32)
+ Opc = IsSigned ? PPC::XSCVDPSXWS : PPC::XSCVDPUXWS;
+ else
+ Opc = IsSigned ? PPC::XSCVDPSXDS : PPC::XSCVDPUXDS;
} else {
DestReg = createResultReg(&PPC::F8RCRegClass);
if (DstVT == MVT::i32)