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CPU/PGXP: Combine logical/arithmetic shift functions

This commit is contained in:
Stenzek 2024-08-20 17:23:36 +10:00
parent 3548bbcf90
commit bcd2424db3
No known key found for this signature in database
1 changed files with 25 additions and 80 deletions
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105
src/core/cpu_pgxp.cpp
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@ -90,8 +90,7 @@ static void ValidateAndLoadMem16(PGXP_value* dest, u32 addr, u32 value, bool sig
static void CPU_MTC2_int(const PGXP_value& value, u32 reg, u32 val);
static void CPU_BITWISE(Instruction instr, u32 rdVal, u32 rsVal, u32 rtVal);
static void CPU_SLL(Instruction instr, u32 rtVal, u32 sh);
static void CPU_SRL(Instruction instr, u32 rtVal, u32 sh);
static void CPU_SRA(Instruction instr, u32 rtVal, u32 sh, bool is_variable);
static void CPU_SRx(Instruction instr, u32 rtVal, u32 sh, bool sign, bool is_variable);
static void WriteMem(u32 addr, const PGXP_value& value);
static void WriteMem16(u32 addr, const PGXP_value& value);
@ -1384,23 +1383,23 @@ void CPU::PGXP::CPU_SLLV(Instruction instr, u32 rtVal, u32 rsVal)
CPU_SLL(instr, rtVal, sh);
}
ALWAYS_INLINE_RELEASE void CPU::PGXP::CPU_SRL(Instruction instr, u32 rtVal, u32 sh)
ALWAYS_INLINE_RELEASE void CPU::PGXP::CPU_SRx(Instruction instr, u32 rtVal, u32 sh, bool sign, bool is_variable)
{
const u32 rdVal = rtVal >> sh;
const u32 rdVal = sign ? static_cast<u32>(static_cast<s32>(rtVal) >> sh) : (rtVal >> sh);
PGXP_value& prtVal = ValidateAndGetRtValue(instr, rtVal);
double x = prtVal.x;
double y = f16Unsign(prtVal.y);
double y = sign ? prtVal.y : f16Unsign(prtVal.y);
const u32 iX = SignExtend32(LOWORD_S16(rtVal)); // remove Y
const u32 iY = SET_LOWORD(rtVal, HIWORD_U16(iX)); // overwrite x with sign(x)
// Shift test values
const u32 dX = static_cast<u32>(static_cast<s32>(iX) >> sh);
const u32 dY = iY >> sh;
const u32 dY = sign ? static_cast<u32>(static_cast<s32>(iY) >> sh) : (iY >> sh);
if (LOWORD_S16(dX) != HIWORD_S16(iX))
x = x / (1 << sh);
x = x / static_cast<double>(1 << sh);
else
x = LOWORD_S16(dX); // only sign bits left
@ -1412,20 +1411,20 @@ ALWAYS_INLINE_RELEASE void CPU::PGXP::CPU_SRL(Instruction instr, u32 rtVal, u32
}
else if (sh < 16)
{
x += y * static_cast<float>(1 << (16 - sh));
if (GetRtValue(instr).x < 0)
x += static_cast<float>(1 << (16 - sh));
x += y * static_cast<double>(1 << (16 - sh));
if (prtVal.x < 0)
x += static_cast<double>(1 << (16 - sh));
}
else
{
x += y / static_cast<float>(1 << (sh - 16));
x += y / static_cast<double>(1 << (sh - 16));
}
}
if ((HIWORD_S16(dY) == 0) || (HIWORD_S16(dY) == -1))
y = HIWORD_S16(dY);
else
y = y / static_cast<float>(1 << sh);
y = y / static_cast<double>(1 << sh);
PGXP_value& prdVal = GetRdValue(instr);
prdVal = prtVal;
@ -1433,6 +1432,16 @@ ALWAYS_INLINE_RELEASE void CPU::PGXP::CPU_SRL(Instruction instr, u32 rtVal, u32
prdVal.y = static_cast<float>(f16Sign(y));
prdVal.value = rdVal;
prdVal.flags |= VALID_TAINTED_Z;
// Use low precision/rounded values when we're not shifting an entire component,
// and it's not originally from a 3D value. Too many false positives in P2/etc.
// What we probably should do is not set the valid flag on non-3D values to begin
// with, only letting them become valid when used in another expression.
if (sign && !is_variable && !(prdVal.flags & VALID_Z) && sh < 16)
{
prdVal.flags = 0;
MakeValid(&prdVal, rdVal);
}
}
void CPU::PGXP::CPU_SRL(Instruction instr, u32 rtVal)
@ -1441,7 +1450,7 @@ void CPU::PGXP::CPU_SRL(Instruction instr, u32 rtVal)
// Rd = Rt >> Sa
const u32 sh = instr.r.shamt;
CPU_SRL(instr, rtVal, sh);
CPU_SRx(instr, rtVal, sh, false, false);
}
void CPU::PGXP::CPU_SRLV(Instruction instr, u32 rtVal, u32 rsVal)
@ -1450,71 +1459,7 @@ void CPU::PGXP::CPU_SRLV(Instruction instr, u32 rtVal, u32 rsVal)
// Rd = Rt >> Sa
const u32 sh = rsVal & 0x1F;
CPU_SRL(instr, rtVal, sh);
}
void CPU::PGXP::CPU_SRA(Instruction instr, u32 rtVal, u32 sh, bool is_variable)
{
const u32 rdVal = static_cast<u32>(static_cast<s32>(rtVal) >> sh);
PGXP_value& prtVal = ValidateAndGetRtValue(instr, rtVal);
double x = prtVal.x;
double y = prtVal.y;
const u32 iX = SignExtend32(LOWORD_S16(rtVal)); // remove Y
const u32 iY = SET_LOWORD(rtVal, HIWORD_U16(iX)); // overwrite x with sign(x)
// Shift test values
const u32 dX = static_cast<u32>(static_cast<s32>(iX) >> sh);
const u32 dY = static_cast<u32>(static_cast<s32>(iY) >> sh);
if (LOWORD_S16(dX) != HIWORD_S16(iX))
x = x / (1 << sh);
else
x = LOWORD_S16(dX); // only sign bits left
if (LOWORD_S16(dY) != HIWORD_S16(iX))
{
if (sh == 16)
{
x = y;
}
else if (sh < 16)
{
x += y * (1 << (16 - sh));
if (GetRtValue(instr).x < 0)
x += 1 << (16 - sh);
}
else
{
x += y / (1 << (sh - 16));
}
}
if ((HIWORD_S16(dY) == 0) || (HIWORD_S16(dY) == -1))
y = HIWORD_S16(dY);
else
y = y / (1 << sh);
x = f16Sign(x);
y = f16Sign(y);
PGXP_value& prdVal = GetRdValue(instr);
prdVal = prtVal;
prdVal.x = static_cast<float>(x);
prdVal.y = static_cast<float>(y);
prdVal.value = rdVal;
prdVal.flags |= VALID_TAINTED_Z;
// Use low precision/rounded values when we're not shifting an entire component,
// and it's not originally from a 3D value. Too many false positives in P2/etc.
// What we probably should do is not set the valid flag on non-3D values to begin
// with, only letting them become valid when used in another expression.
if (!is_variable && !(prdVal.flags & VALID_Z) && sh < 16)
{
prdVal.flags = 0;
MakeValid(&prdVal, rdVal);
}
CPU_SRx(instr, rtVal, sh, false, true);
}
void CPU::PGXP::CPU_SRA(Instruction instr, u32 rtVal)
@ -1523,7 +1468,7 @@ void CPU::PGXP::CPU_SRA(Instruction instr, u32 rtVal)
// Rd = Rt >> Sa
const u32 sh = instr.r.shamt;
CPU_SRA(instr, rtVal, sh, false);
CPU_SRx(instr, rtVal, sh, true, false);
}
void CPU::PGXP::CPU_SRAV(Instruction instr, u32 rtVal, u32 rsVal)
@ -1532,7 +1477,7 @@ void CPU::PGXP::CPU_SRAV(Instruction instr, u32 rtVal, u32 rsVal)
// Rd = Rt >> Sa
const u32 sh = rsVal & 0x1F;
CPU_SRA(instr, rtVal, sh, true);
CPU_SRx(instr, rtVal, sh, true, true);
}
void CPU::PGXP::CPU_MFC0(Instruction instr, u32 rdVal)