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- affine need_to_preserve[] to get close to linux/x86_64 ABI

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- optimize NOP fillers on x86-64 (based on GNU as implementation)
This commit is contained in:
gbeauche 2004-11-01 17:12:55 +00:00
parent 382294ef55
commit b3bd00f159
1 changed files with 28 additions and 1 deletions
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29
BasiliskII/src/uae_cpu/compiler/codegen_x86.cpp
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@ -107,7 +107,12 @@ uae_u8 call_saved[]={0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0};
- Special registers (such like the stack pointer) should not be "preserved" - Special registers (such like the stack pointer) should not be "preserved"
by pushing, even though they are "saved" across function calls by pushing, even though they are "saved" across function calls
*/ */
uae_u8 need_to_preserve[]={1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1}; #if defined(__x86_64__)
/* callee-saved registers as defined by Linux/x86_64 ABI: rbx, rbp, rsp, r12 - r15 */
static const uae_u8 need_to_preserve[]={0,0,0,1,0,1,0,0,0,0,0,0,1,1,1,1};
#else
static const uae_u8 need_to_preserve[]={1,1,1,1,0,1,1,1};
#endif
/* Whether classes of instructions do or don't clobber the native flags */ /* Whether classes of instructions do or don't clobber the native flags */
#define CLOBBER_MOV #define CLOBBER_MOV
@ -3139,7 +3144,28 @@ static __inline__ void raw_emit_nop_filler(int nbytes)
f32_1, f32_2, f32_3, f32_4, f32_5, f32_6, f32_7, f32_8, f32_1, f32_2, f32_3, f32_4, f32_5, f32_6, f32_7, f32_8,
f32_9, f32_10, f32_11, f32_12, f32_13, f32_14, f32_15 f32_9, f32_10, f32_11, f32_12, f32_13, f32_14, f32_15
}; };
static const uae_u8 prefixes[4] = { 0x66, 0x66, 0x66, 0x66 };
#if defined(__x86_64__)
/* The recommended way to pad 64bit code is to use NOPs preceded by
maximally four 0x66 prefixes. Balance the size of nops. */
if (nbytes == 0)
return;
int i;
int nnops = (nbytes + 3) / 4;
int len = nbytes / nnops;
int remains = nbytes - nnops * len;
for (i = 0; i < remains; i++) {
emit_block(prefixes, len);
raw_nop();
}
for (; i < nnops; i++) {
emit_block(prefixes, len - 1);
raw_nop();
}
#else
int nloops = nbytes / 16; int nloops = nbytes / 16;
while (nloops-- > 0) while (nloops-- > 0)
emit_block(f32_16, sizeof(f32_16)); emit_block(f32_16, sizeof(f32_16));
@ -3147,6 +3173,7 @@ static __inline__ void raw_emit_nop_filler(int nbytes)
nbytes %= 16; nbytes %= 16;
if (nbytes) if (nbytes)
emit_block(f32_patt[nbytes - 1], nbytes); emit_block(f32_patt[nbytes - 1], nbytes);
#endif
} }