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x86-32 recompiler performs float->integer rounding by loading FPU control word instead of calling helper function - speedup on some stuff.

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This commit is contained in:
SarahW 2016-09-18 14:57:10 +01:00
commit dd2a608707
6 changed files with 88 additions and 182 deletions
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7
src/x87_ops_misc.h
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@ -32,6 +32,7 @@ static int opFINIT(uint32_t fetchdat)
FP_ENTER();
cpu_state.pc++;
cpu_state.npxc = 0x37F;
cpu_state.new_npxc = (cpu_state.old_npxc & ~0xc00);
cpu_state.npxs = 0;
*(uint64_t *)cpu_state.tag = 0x0303030303030303ll;
cpu_state.TOP = 0;
@ -85,6 +86,7 @@ static int FSTOR()
case 0x000: /*16-bit real mode*/
case 0x001: /*16-bit protected mode*/
cpu_state.npxc = readmemw(easeg, cpu_state.eaaddr);
cpu_state.new_npxc = (cpu_state.old_npxc & ~0xc00) | (cpu_state.npxc & 0xc00);
cpu_state.npxs = readmemw(easeg, cpu_state.eaaddr+2);
x87_settag(readmemw(easeg, cpu_state.eaaddr+4));
cpu_state.TOP = (cpu_state.npxs >> 11) & 7;
@ -93,6 +95,7 @@ static int FSTOR()
case 0x100: /*32-bit real mode*/
case 0x101: /*32-bit protected mode*/
cpu_state.npxc = readmemw(easeg, cpu_state.eaaddr);
cpu_state.new_npxc = (cpu_state.old_npxc & ~0xc00) | (cpu_state.npxc & 0xc00);
cpu_state.npxs = readmemw(easeg, cpu_state.eaaddr+4);
x87_settag(readmemw(easeg, cpu_state.eaaddr+8));
cpu_state.TOP = (cpu_state.npxs >> 11) & 7;
@ -665,6 +668,7 @@ static int FLDENV()
case 0x000: /*16-bit real mode*/
case 0x001: /*16-bit protected mode*/
cpu_state.npxc = readmemw(easeg, cpu_state.eaaddr);
cpu_state.new_npxc = (cpu_state.old_npxc & ~0xc00) | (cpu_state.npxc & 0xc00);
cpu_state.npxs = readmemw(easeg, cpu_state.eaaddr+2);
x87_settag(readmemw(easeg, cpu_state.eaaddr+4));
cpu_state.TOP = (cpu_state.npxs >> 11) & 7;
@ -672,6 +676,7 @@ static int FLDENV()
case 0x100: /*32-bit real mode*/
case 0x101: /*32-bit protected mode*/
cpu_state.npxc = readmemw(easeg, cpu_state.eaaddr);
cpu_state.new_npxc = (cpu_state.old_npxc & ~0xc00) | (cpu_state.npxc & 0xc00);
cpu_state.npxs = readmemw(easeg, cpu_state.eaaddr+4);
x87_settag(readmemw(easeg, cpu_state.eaaddr+8));
cpu_state.TOP = (cpu_state.npxs >> 11) & 7;
@ -705,6 +710,7 @@ static int opFLDCW_a16(uint32_t fetchdat)
tempw = geteaw();
if (cpu_state.abrt) return 1;
cpu_state.npxc = tempw;
cpu_state.new_npxc = (cpu_state.old_npxc & ~0xc00) | (cpu_state.npxc & 0xc00);
CLOCK_CYCLES(4);
return 0;
}
@ -717,6 +723,7 @@ static int opFLDCW_a32(uint32_t fetchdat)
tempw = geteaw();
if (cpu_state.abrt) return 1;
cpu_state.npxc = tempw;
cpu_state.new_npxc = (cpu_state.old_npxc & ~0xc00) | (cpu_state.npxc & 0xc00);
CLOCK_CYCLES(4);
return 0;
}