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Optimize a common case of the ins instruction

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This commit is contained in:
Henrik Rydgård 2024-06-08 23:10:29 +02:00
parent c9ca3904d3
commit 2ff91fab2b
1 changed files with 14 additions and 3 deletions
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17
Core/MIPS/IR/IRCompALU.cpp
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@ -248,9 +248,20 @@ void IRFrontend::Comp_Special3(MIPSOpcode op) {
{
u32 sourcemask = mask >> pos;
u32 destmask = ~(sourcemask << pos);
ir.Write(IROp::AndConst, IRTEMP_0, rs, ir.AddConstant(sourcemask));
if (pos != 0) {
ir.Write(IROp::ShlImm, IRTEMP_0, IRTEMP_0, pos);
if (size != 32) {
// Need to use the sourcemask.
ir.Write(IROp::AndConst, IRTEMP_0, rs, ir.AddConstant(sourcemask));
if (pos != 0) {
ir.Write(IROp::ShlImm, IRTEMP_0, IRTEMP_0, pos);
}
} else {
// If the shl takes care of the sourcemask, don't need to and.
if (pos != 0) {
ir.Write(IROp::ShlImm, IRTEMP_0, rs, pos);
} else {
ir.Write(IROp::Mov, IRTEMP_0, rs);
}
}
ir.Write(IROp::AndConst, rt, rt, ir.AddConstant(destmask));
ir.Write(IROp::Or, rt, rt, IRTEMP_0);