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| author | Jim Grosbach <grosbach@apple.com> | 2011-12-05 21:06:26 +0000 |
|---|---|---|
| committer | Jim Grosbach <grosbach@apple.com> | 2011-12-05 21:06:26 +0000 |
| commit | ec9ba98299a7bd98cee20831b342685576a6a6e8 (patch) | |
| tree | 67774a3149dc251128aaceab2fe1375501e4aee7 /llvm/lib/Target | |
| parent | 34e3df76f99b036fdd92bc033bc12abff4c0fb74 (diff) | |
| download | bcm5719-llvm-ec9ba98299a7bd98cee20831b342685576a6a6e8.tar.gz bcm5719-llvm-ec9ba98299a7bd98cee20831b342685576a6a6e8.zip | |
Thumb2 prefer encoding T3 to T4 for ADD/SUB immediate instructions.
rdar://10529348
llvm-svn: 145851
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp index 5b1fe36d4a0..cd6752a241c 100644 --- a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp +++ b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp @@ -5200,6 +5200,24 @@ processInstruction(MCInst &Inst, Inst = TmpInst; } break; + case ARM::t2ADDri12: + // If the immediate fits for encoding T3 (t2ADDri) and the generic "add" + // mnemonic was used (not "addw"), encoding T3 is preferred. + if (static_cast<ARMOperand*>(Operands[0])->getToken() != "add" || + ARM_AM::getT2SOImmVal(Inst.getOperand(2).getImm()) == -1) + break; + Inst.setOpcode(ARM::t2ADDri); + Inst.addOperand(MCOperand::CreateReg(0)); // cc_out + break; + case ARM::t2SUBri12: + // If the immediate fits for encoding T3 (t2SUBri) and the generic "sub" + // mnemonic was used (not "subw"), encoding T3 is preferred. + if (static_cast<ARMOperand*>(Operands[0])->getToken() != "sub" || + ARM_AM::getT2SOImmVal(Inst.getOperand(2).getImm()) == -1) + break; + Inst.setOpcode(ARM::t2SUBri); + Inst.addOperand(MCOperand::CreateReg(0)); // cc_out + break; case ARM::tADDi8: // If the immediate is in the range 0-7, we want tADDi3 iff Rd was // explicitly specified. From the ARM ARM: "Encoding T1 is preferred |
