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ir: Add A64-specific opcodes for getting and setting raw NZCV values

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This will be necessary to implement the flag manipulation and flag
format instructions.
This commit is contained in:
Lioncash
2019-03-06 13:54:09 -05:00
committed by MerryMage
parent 4f937c1ee1
commit 597a8be5d5
5 changed files with 29 additions and 0 deletions
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15
src/backend/x64/a64_emit_x64.cpp
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@@ -368,6 +368,21 @@ void A64EmitX64::EmitA64GetCFlag(A64EmitContext& ctx, IR::Inst* inst) {
ctx.reg_alloc.DefineValue(inst, result);
}
void A64EmitX64::EmitA64GetNZCVRaw(A64EmitContext& ctx, IR::Inst* inst) {
const Xbyak::Reg32 nzcv_raw = ctx.reg_alloc.ScratchGpr().cvt32();
code.mov(nzcv_raw, dword[r15 + offsetof(A64JitState, CPSR_nzcv)]);
ctx.reg_alloc.DefineValue(inst, nzcv_raw);
}
void A64EmitX64::EmitA64SetNZCVRaw(A64EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Reg32 nzcv_raw = ctx.reg_alloc.UseScratchGpr(args[0]).cvt32();
code.and_(nzcv_raw, 0xF0000000);
code.mov(dword[r15 + offsetof(A64JitState, CPSR_nzcv)], nzcv_raw);
}
void A64EmitX64::EmitA64SetNZCV(A64EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
Xbyak::Reg32 to_store = ctx.reg_alloc.UseScratchGpr(args[0]).cvt32();