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Code Activity

X86: No longer make st7 available as a temporary

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* include/lightning/jit_x86.h, lib/jit_x86-cpu.c,
	lib/jit_x86-x87.c: No longer make st(7) available.
	Need to keep one x87 slots empty to avoid exceptions.
	This has the side effect of no longer needing the
	hackish emms instruction before a function call.
This commit is contained in:
pcpa 2015-02-17 13:55:01 -02:00
parent 2597bf3c13
commit 9f72e66116
4 changed files with 10 additions and 8 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2015-02-17 Paulo Andrade <pcpa@gnu.org>
* include/lightning/jit_x86.h, lib/jit_x86-cpu.c,
lib/jit_x86-x87.c: No longer make st(7) available.
Need to keep one x87 slots empty to avoid exceptions.
This has the side effect of no longer needing the
hackish emms instruction before a function call.
2015-02-16 Paulo Andrade <pcpa@gnu.org>
* lib/lightning.c: Remove the jit_regno_patch bitfield

5
include/lightning/jit_x86.h
View file

@ -27,7 +27,7 @@
* Types
*/
#define jit_sse2_p() jit_cpu.sse2
#define jit_x87_reg_p(reg) ((reg) >= _ST0 && (reg) <= _ST7)
#define jit_x87_reg_p(reg) ((reg) >= _ST0 && (reg) <= _ST6)
#if __WORDSIZE == 32
# if defined(__x86_64__)
# define __X64_32 1
@ -64,7 +64,6 @@ typedef enum {
# define JIT_F4 (jit_sse2_p() ? _XMM4 : _ST4)
# define JIT_F5 (jit_sse2_p() ? _XMM5 : _ST5)
# define JIT_F6 (jit_sse2_p() ? _XMM6 : _ST6)
# define JIT_F7 (jit_sse2_p() ? _XMM7 : _ST7)
_XMM0, _XMM1, _XMM2, _XMM3, _XMM4, _XMM5, _XMM6, _XMM7,
# define jit_sse_reg_p(reg) ((reg) >= _XMM0 && (reg) <= _XMM7)
#else
@ -148,7 +147,7 @@ typedef enum {
# define jit_sse_reg_p(reg) ((reg) >= _XMM8 && (reg) <= _XMM0)
# endif
#endif
_ST0, _ST1, _ST2, _ST3, _ST4, _ST5, _ST6, _ST7,
_ST0, _ST1, _ST2, _ST3, _ST4, _ST5, _ST6,
# define JIT_NOREG _NOREG
_NOREG,
} jit_reg_t;

4
lib/jit_x86-cpu.c
View file

@ -3390,9 +3390,6 @@ _bxsubi_u(jit_state_t *_jit, jit_word_t i0, jit_int32_t r0, jit_word_t i1)
static void
_callr(jit_state_t *_jit, jit_int32_t r0)
{
#if __X32
emms();
#endif
rex(0, 0, _NOREG, _NOREG, r0);
ic(0xff);
mrm(0x03, 0x02, r7(r0));
@ -3411,7 +3408,6 @@ _calli(jit_state_t *_jit, jit_word_t i0)
jit_unget_reg(reg);
#else
jit_word_t w;
emms();
ic(0xe8);
w = i0 - (_jit->pc.w + 4);
ii(w);

1
lib/jit_x86-x87.c
View file

@ -34,7 +34,6 @@
# define _ST4_REGNO 4
# define _ST5_REGNO 5
# define _ST6_REGNO 6
# define _ST7_REGNO 7
# define x87rx(code, md, rb, ri, ms) _x87rx(_jit, code, md, rb, ri, ms)
# define fldcwm(md, rb, ri, ms) x87rx(015, md, rb, ri, ms)
# define fstcwm(md, rb, ri, ms) _fstcwm(_jit, md, rb, ri, ms)