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[Mips] Emit the correct DINS variant 

This patch fixes emitting of correct variant of DINS instruction.

Differential Revision: https://reviews.llvm.org/D30988

llvm-svn: 298596
This commit is contained in:
Strahinja Petrovic 2017-03-23 13:40:07 +00:00
parent 1f7e7d3d93
commit f9fa62e576
1 changed files with 11 additions and 8 deletions
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19
llvm/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
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@ -111,18 +111,21 @@ static void LowerDins(MCInst& InstIn) {
assert(InstIn.getOperand(3).isImm());
int64_t size = InstIn.getOperand(3).getImm();
if (size <= 32) {
if (pos < 32) // DINS, do nothing
return;
assert((pos + size) <= 64 &&
"DINS cannot have position plus size over 64");
if (pos < 32) {
if ((pos + size) > 0 && (pos + size) <= 32)
return; // DINS, do nothing
else if ((pos + size) > 32) {
//DINSM
InstIn.getOperand(3).setImm(size - 32);
InstIn.setOpcode(Mips::DINSM);
}
} else if ((pos + size) > 32 && (pos + size) <= 64) {
// DINSU
InstIn.getOperand(2).setImm(pos - 32);
InstIn.setOpcode(Mips::DINSU);
return;
}
// DINSM
assert(pos < 32 && "DINS cannot have both size and pos > 32");
InstIn.getOperand(3).setImm(size - 32);
InstIn.setOpcode(Mips::DINSM);
}
// Fix a bad compact branch encoding for beqc/bnec.