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[SystemZ] Don't build a PPA instruction with an immediate 0 operand.

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The improvement in the machine verifier for operand types (D63973) discovered
a bad operand in a test using a PPA instruction. It was an immediate 0 where
a register was expected.

This patch fixes this (NFC) by now making the PPA second register operand
NoRegister instead of a zero immediate in the MIR.

Review: Ulrich Weigand
https://reviews.llvm.org/D70501
This commit is contained in:
Jonas Paulsson 2019-11-26 11:16:48 +01:00
parent 901cd5aed5
commit 348aec416e
2 changed files with 7 additions and 3 deletions
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8
lib/Target/SystemZ/MCTargetDesc/SystemZInstPrinter.cpp
View File

@ -41,8 +41,12 @@ void SystemZInstPrinter::printAddress(unsigned Base, int64_t Disp,
void SystemZInstPrinter::printOperand(const MCOperand &MO, const MCAsmInfo *MAI,
raw_ostream &O) {
if (MO.isReg())
O << '%' << getRegisterName(MO.getReg());
if (MO.isReg()) {
if (!MO.getReg())
O << '0';
else
O << '%' << getRegisterName(MO.getReg());
}
else if (MO.isImm())
O << MO.getImm();
else if (MO.isExpr())

2
lib/Target/SystemZ/SystemZInstrInfo.td
View File

@ -2069,7 +2069,7 @@ let Predicates = [FeatureProcessorAssist] in {
def PPA : SideEffectTernaryRRFc<"ppa", 0xB2E8, GR64, GR64, imm32zx4>;
def : Pat<(int_s390_ppa_txassist GR32:$src),
(PPA (INSERT_SUBREG (i64 (IMPLICIT_DEF)), GR32:$src, subreg_l32),
0, 1)>;
zero_reg, 1)>;
}
//===----------------------------------------------------------------------===//