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FPU rounding modes now have effect in FADD double precision. Fixes rendering in Interstate '76.

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This commit is contained in:
TomW 2015-09-21 21:54:43 +01:00
commit 986476b9db
4 changed files with 75 additions and 0 deletions
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35
src/codegen_ops_x86.h
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@ -2496,6 +2496,34 @@ static void FP_OP_D(int op)
addbyte(0x89); /*MOV [ESP], EAX*/
addbyte(0x04);
addbyte(0x24);
if (((npxc >> 10) & 3) && op == FPU_ADD)
{
addbyte(0x9b); /*FSTCW [ESP+8]*/
addbyte(0xd9);
addbyte(0x7c);
addbyte(0x24);
addbyte(0x08);
addbyte(0x66); /*MOV AX, [ESP+8]*/
addbyte(0x8b);
addbyte(0x44);
addbyte(0x24);
addbyte(0x08);
addbyte(0x66); /*AND AX, ~(3 << 10)*/
addbyte(0x25);
addword(~(3 << 10));
addbyte(0x66); /*OR AX, npxc & (3 << 10)*/
addbyte(0x0d);
addword(npxc & (3 << 10));
addbyte(0x66); /*MOV [ESP+12], AX*/
addbyte(0x89);
addbyte(0x44);
addbyte(0x24);
addbyte(0x0c);
addbyte(0xd9); /*FLDCW [ESP+12]*/
addbyte(0x6c);
addbyte(0x24);
addbyte(0x0c);
}
addbyte(0x89); /*MOV [ESP+4], EDX*/
addbyte(0x54);
addbyte(0x24);
@ -2515,6 +2543,13 @@ static void FP_OP_D(int op)
addbyte(0x1c);
addbyte(0xdd);
addlong((uintptr_t)ST);
if (((npxc >> 10) & 3) && op == FPU_ADD)
{
addbyte(0xd9); /*FLDCW [ESP+8]*/
addbyte(0x6c);
addbyte(0x24);
addbyte(0x08);
}
}
static void FP_OP_IW(int op)
{