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Merge pull request #500 from lioncash/cbz

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A32: Implement Thumb-1's CBZ/CBNZ instructions
This commit is contained in:
Merry
2019-05-05 18:48:13 +01:00
committed by MerryMage
parent 0495b2c779 03e6899fd7
commit fd6222f0a1
11 changed files with 61 additions and 3 deletions
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15
src/backend/x64/a32_emit_x64.cpp
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@@ -501,6 +501,12 @@ void A32EmitX64::EmitA32SetZFlag(A32EmitContext& ctx, IR::Inst* inst) {
}
}
void A32EmitX64::EmitA32SetCheckBit(A32EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Reg8 to_store = ctx.reg_alloc.UseGpr(args[0]).cvt8();
code.mov(code.byte[r15 + offsetof(A32JitState, check_bit)], to_store);
}
void A32EmitX64::EmitA32GetCFlag(A32EmitContext& ctx, IR::Inst* inst) {
const Xbyak::Reg32 result = ctx.reg_alloc.ScratchGpr().cvt32();
code.mov(result, dword[r15 + offsetof(A32JitState, CPSR_nzcv)]);
@@ -1320,8 +1326,13 @@ void A32EmitX64::EmitTerminalImpl(IR::Term::If terminal, IR::LocationDescriptor
EmitTerminal(terminal.then_, initial_location);
}
void A32EmitX64::EmitTerminalImpl(IR::Term::CheckBit, IR::LocationDescriptor) {
ASSERT_MSG(false, "Term::CheckBit should never be emitted by the A32 frontend");
void A32EmitX64::EmitTerminalImpl(IR::Term::CheckBit terminal, IR::LocationDescriptor initial_location) {
Xbyak::Label fail;
code.cmp(code.byte[r15 + offsetof(A32JitState, check_bit)], u8(0));
code.jz(fail);
EmitTerminal(terminal.then_, initial_location);
code.L(fail);
EmitTerminal(terminal.else_, initial_location);
}
void A32EmitX64::EmitTerminalImpl(IR::Term::CheckHalt terminal, IR::LocationDescriptor initial_location) {

1
src/backend/x64/a32_jitstate.h
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@@ -53,6 +53,7 @@ struct A32JitState {
s64 cycles_to_run = 0;
s64 cycles_remaining = 0;
bool halt_requested = false;
bool check_bit = false;
// Exclusive state
static constexpr u32 RESERVATION_GRANULE_MASK = 0xFFFFFFF8;