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Fix fpscr <-> GPR latency info.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117737 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-10-29 23:16:55 +00:00
parent d179886f05
commit e09206d4d7
3 changed files with 12 additions and 4 deletions
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11
lib/Target/ARM/ARMBaseInstrInfo.cpp
View File

@ -1914,9 +1914,16 @@ ARMBaseInstrInfo::getOperandLatency(const InstrItineraryData *ItinData,
const TargetInstrDesc &UseTID = UseMI->getDesc();
const MachineOperand &DefMO = DefMI->getOperand(DefIdx);
if (DefMO.getReg() == ARM::CPSR && UseTID.isBranch())
if (DefMO.getReg() == ARM::CPSR) {
if (DefMI->getOpcode() == ARM::FMSTAT) {
// fpscr -> cpsr stalls over 20 cycles on A8 (and earlier?)
return Subtarget.isCortexA9() ? 1 : 20;
}
// CPSR set and branch can be paired in the same cycle.
return 0;
if (UseTID.isBranch())
return 0;
}
unsigned DefAlign = DefMI->hasOneMemOperand()
? (*DefMI->memoperands_begin())->getAlignment() : 0;

2
lib/Target/ARM/ARMScheduleA8.td
View File

@ -237,7 +237,7 @@ def CortexA8Itineraries : ProcessorItineraries<
//
// FP Special Register to Integer Register File Move
InstrItinData<IIC_fpSTAT , [InstrStage<1, [A8_Pipe0, A8_Pipe1]>,
InstrStage<1, [A8_NLSPipe]>]>,
InstrStage<1, [A8_NLSPipe]>], [20]>,
//
// Single-precision FP Unary
InstrItinData<IIC_fpUNA32 , [InstrStage<1, [A8_Pipe0, A8_Pipe1]>,

3
lib/Target/ARM/ARMScheduleA9.td
View File

@ -431,7 +431,8 @@ def CortexA9Itineraries : ProcessorItineraries<
InstrStage<1, [A9_MUX0], 0>,
InstrStage<1, [A9_DRegsVFP], 0, Required>,
InstrStage<2, [A9_DRegsN], 0, Reserved>,
InstrStage<1, [A9_NPipe]>]>,
InstrStage<1, [A9_NPipe]>],
[1]>,
//
// Single-precision FP Unary
InstrItinData<IIC_fpUNA32 , [InstrStage<1, [A9_Issue0, A9_Issue1], 0>,