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UserspaceEmulator: Add more FIXMES to SoftFPU
This also includes an exception check for sqrt and two pow(2,...) -> exp2(...) changes.
This commit is contained in:
Hendiadyoin1
Andreas Kling
parent
62668ebd81
commit
60cb5b8dfa
1 changed files with 35 additions and 18 deletions
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@ -400,7 +400,6 @@ void SoftFPU::FBSTP_M80(const X86::Instruction&) { TODO_INSN(); }
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void SoftFPU::FXCH(const X86::Instruction& insn)
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{
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// FIXME: implicit argument `D9 C9` -> st[0] <-> st[1]?
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VERIFY(insn.modrm().is_register());
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set_c1(0);
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auto tmp = fpu_get(0);
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@ -520,6 +519,7 @@ void SoftFPU::FSUB_RM32(const X86::Instruction& insn)
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void SoftFPU::FSUB_RM64(const X86::Instruction& insn)
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{
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if (insn.modrm().is_register()) {
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// Note: This is FSUBR (DC E8+i FSUBR st(i) st(0)) in the spec
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fpu_set(insn.modrm().register_index(), fpu_get(insn.modrm().register_index()) - fpu_get(0));
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} else {
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auto new_f64 = insn.modrm().read64(m_cpu, insn);
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@ -549,6 +549,7 @@ void SoftFPU::FSUBR_RM32(const X86::Instruction& insn)
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void SoftFPU::FSUBR_RM64(const X86::Instruction& insn)
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{
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if (insn.modrm().is_register()) {
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// Note: This is FSUB (DC E0+i FSUB st(i) st(0)) in the spec
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fpu_set(insn.modrm().register_index(), fpu_get(insn.modrm().register_index()) - fpu_get(0));
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} else {
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auto new_f64 = insn.modrm().read64(m_cpu, insn);
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@ -655,6 +656,7 @@ void SoftFPU::FDIV_RM32(const X86::Instruction& insn)
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void SoftFPU::FDIV_RM64(const X86::Instruction& insn)
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{
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if (insn.modrm().is_register()) {
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// Note: This is FDIVR (DC F0+i FDIVR st(i) st(0)) in the spec
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fpu_set(insn.modrm().register_index(), fpu_get(insn.modrm().register_index()) / fpu_get(0));
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} else {
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auto new_f64 = insn.modrm().read64(m_cpu, insn);
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@ -687,8 +689,7 @@ void SoftFPU::FDIVR_RM32(const X86::Instruction& insn)
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void SoftFPU::FDIVR_RM64(const X86::Instruction& insn)
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{
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if (insn.modrm().is_register()) {
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// XXX this is FDIVR, Instruction decodes this weirdly
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// fpu_set(insn.modrm().register_index(), fpu_get(0) / fpu_get(insn.modrm().register_index()));
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// Note: This is FDIV (DC F8+i FDIV st(i) st(0)) in the spec
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fpu_set(insn.modrm().register_index(), fpu_get(insn.modrm().register_index()) / fpu_get(0));
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} else {
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auto new_f64 = insn.modrm().read64(m_cpu, insn);
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@ -742,7 +743,8 @@ void SoftFPU::FIDIVR_RM32(const X86::Instruction& insn)
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void SoftFPU::FPREM(const X86::Instruction&)
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{
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// FIXME: There are some exponent shenanigans supposed to be here
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// FIXME: FPREM should only be able to reduce top's exponent by a maximum
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// amount of 32-63 (impl-specific)
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long double top = fpu_get(0);
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long double one = fpu_get(1);
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@ -757,7 +759,8 @@ void SoftFPU::FPREM(const X86::Instruction&)
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}
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void SoftFPU::FPREM1(const X86::Instruction&)
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{
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// FIXME: There are some exponent shenanigans supposed to be here
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// FIXME: FPREM1 should only be able to reduce top's exponent by a maximum
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// amount of 32-63 (impl-specific)
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long double top = fpu_get(0);
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long double one = fpu_get(1);
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@ -783,19 +786,22 @@ void SoftFPU::FCHS(const X86::Instruction&)
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void SoftFPU::FRNDINT(const X86::Instruction&)
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{
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// FIXME: Raise #IA #D
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auto res = fpu_round_checked<long double>(fpu_get(0));
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fpu_set(0, res);
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}
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void SoftFPU::FSCALE(const X86::Instruction&)
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{
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// FIXME: set C1 upon stack overflow or if result was rounded
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fpu_set(0, fpu_get(0) * powl(2, truncl(fpu_get(1))));
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// FIXME: Raise #IA #D #U #O #P
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fpu_set(0, fpu_get(0) * exp2l(truncl(fpu_get(1))));
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}
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void SoftFPU::FSQRT(const X86::Instruction&)
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{
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// FIXME: set C1 upon stack overflow or if result was rounded
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// FIXME: Raise #IA #D #P
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if (fpu_get(0) < 0)
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fpu_set_exception(FPU_Exception::InvalidOperation);
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fpu_set(0, sqrtl(fpu_get(0)));
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}
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@ -993,20 +999,26 @@ void SoftFPU::FXAM(const X86::Instruction&)
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// TRANSCENDENTAL
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void SoftFPU::FSIN(const X86::Instruction&)
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{
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// FIXME: set C1 upon stack overflow or if result was rounded
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// FIXME: Raise #IA #D #P
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// FIXME: Set C1 on when result was rounded up, cleared otherwise
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// FIXME: Set C2 to 1 if ST(0) is outside range of -2^63 to +2^63; else set to 0
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// ST(0) shall remain unchanged in this case
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fpu_set(0, sinl(fpu_get(0)));
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}
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void SoftFPU::FCOS(const X86::Instruction&)
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{
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// FIXME: set C1 upon stack overflow or if result was rounded
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// FIXME: Raise #IA #D #P
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// FIXME: Set C1 on when result was rounded up, cleared otherwise
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// FIXME: Set C2 to 1 if ST(0) is outside range of -2^63 to +2^63; else set to 0
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// ST(0) shall remain unchanged in this case
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fpu_set(0, cosl(fpu_get(0)));
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}
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void SoftFPU::FSINCOS(const X86::Instruction&)
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{
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// FIXME: set C1 upon stack overflow or if result was rounded
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// FIXME: Set C2 to 1 if ST(0) is outside range of -2^63 to +2^63; else set to 0s
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// FIXME: Raise #IA #D #P
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// FIXME: Set C1 on when result was rounded up, cleared otherwise
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// FIXME: Set C2 to 1 if ST(0) is outside range of -2^63 to +2^63; else set to 0
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// ST(0) shall remain unchanged in this case
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long double sin = sinl(fpu_get(0));
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long double cos = cosl(fpu_get(0));
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fpu_set(0, sin);
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@ -1015,25 +1027,30 @@ void SoftFPU::FSINCOS(const X86::Instruction&)
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void SoftFPU::FPTAN(const X86::Instruction&)
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{
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// FIXME: set C1 upon stack overflow or if result was rounded
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// FIXME: Raise #IA #D #U #P
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// FIXME: Set C1 on when result was rounded up, cleared otherwise
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// FIXME: Set C2 to 1 if ST(0) is outside range of -2^63 to +2^63; else set to 0
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// ST(0) shall remain unchanged in this case
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fpu_set(0, tanl(fpu_get(0)));
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fpu_push(1.0f);
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}
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void SoftFPU::FPATAN(const X86::Instruction&)
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{
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// FIXME: set C1 on stack underflow, or on rounding
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// FIXME: Exceptions
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// FIXME: Raise #IA #D #U #P
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// FIXME: Set C1 on when result was rounded up, cleared otherwise
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// Note: Not implemented 80287 quirk:
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// Restriction to 0 ≤ |ST(1)| < |ST(0)| < +∞
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fpu_set(1, atan2l(fpu_get(1), fpu_get(0)));
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fpu_pop();
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}
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void SoftFPU::F2XM1(const X86::Instruction&)
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{
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// FIXME: validate ST(0) is in range –1.0 to +1.0
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// FIXME: Raise #IA #D #U #P
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// FIXME: Set C1 on when result was rounded up, cleared otherwise
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// FIXME: Validate ST(0) is in range –1.0 to +1.0
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auto val = fpu_get(0);
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// FIXME: Set C0, C2, C3 in FPU status word.
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fpu_set(0, powl(2, val) - 1.0l);
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fpu_set(0, exp2(val) - 1.0l);
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}
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void SoftFPU::FYL2X(const X86::Instruction&)
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{
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