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Use correct rounding mode on x86 and x86-64 recompiled versions of PF2ID. Fixes rendering errors on Unreal 3DNow! software renderer

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This commit is contained in:
SarahW 2019-01-10 21:33:29 +00:00
commit 56a4d5cf83
6 changed files with 14 additions and 0 deletions
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1
src/codegen_backend_x86-64.c
View file

@ -310,6 +310,7 @@ void codegen_backend_init()
"stmxcsr %0\n"
: "=m" (cpu_state.old_fp_control)
);
cpu_state.trunc_fp_control = cpu_state.old_fp_control | 0x6000;
}
void codegen_set_rounding_mode(int mode)

5
src/codegen_backend_x86-64_ops.c
View file

@ -541,6 +541,11 @@ void host_x86_LDMXCSR(codeblock_t *block, void *p)
{
codegen_addbyte4(block, 0x0f, 0xae, 0x50 | REG_EBP, offset); /*LDMXCSR offset[EBP]*/
}
else if (offset < (1ull << 32))
{
codegen_addbyte3(block, 0x0f, 0xae, 0x90 | REG_EBP); /*LDMXCSR offset[EBP]*/
codegen_addlong(block, offset);
}
else
{
fatal("host_x86_LDMXCSR - out of range %p\n", p);

2
src/codegen_backend_x86-64_uops.c
View file

@ -1576,7 +1576,9 @@ static int codegen_PF2ID(codeblock_t *block, uop_t *uop)
if (REG_IS_Q(dest_size) && REG_IS_Q(src_size_a))
{
host_x86_LDMXCSR(block, &cpu_state.trunc_fp_control);
host_x86_CVTPS2DQ_XREG_XREG(block, dest_reg, src_reg_a);
host_x86_LDMXCSR(block, &cpu_state.old_fp_control);
}
else
fatal("PF2ID %02x %02x\n", uop->dest_reg_a_real);

1
src/codegen_backend_x86.c
View file

@ -333,6 +333,7 @@ pclog(" offsetof(codeblock_t, next_2)=%i\n", offsetof(codeblock_t, next_2));
: "=m" (cpu_state.old_fp_control2),
"=m" (cpu_state.old_fp_control)
);
cpu_state.trunc_fp_control = cpu_state.old_fp_control | 0x6000;
}
void codegen_set_rounding_mode(int mode)

2
src/codegen_backend_x86_uops.c
View file

@ -1579,7 +1579,9 @@ static int codegen_PF2ID(codeblock_t *block, uop_t *uop)
if (REG_IS_Q(dest_size) && REG_IS_Q(src_size_a))
{
host_x86_LDMXCSR(block, &cpu_state.trunc_fp_control);
host_x86_CVTPS2DQ_XREG_XREG(block, dest_reg, src_reg_a);
host_x86_LDMXCSR(block, &cpu_state.old_fp_control);
}
else
fatal("PF2ID %02x %02x\n", uop->dest_reg_a_real);

3
src/ibm.h
View file

@ -181,6 +181,9 @@ struct
uint32_t old_fp_control, new_fp_control;
#if defined i386 || defined __i386 || defined __i386__ || defined _X86_
uint16_t old_fp_control2, new_fp_control2;
#endif
#if defined i386 || defined __i386 || defined __i386__ || defined _X86_ || defined __amd64__
uint32_t trunc_fp_control;
#endif
x86seg seg_cs,seg_ds,seg_es,seg_ss,seg_fs,seg_gs;