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Rewrite jit_regset_scan1 for easier optimization.

Browse source 
* include/lightning/jit_aarch64.h, include/lightning/jit_arm.h,
	include/lightning/jit_hppa.h, include/lightning/jit_ia64.h,
	include/lightning/jit_mips.h, include/lightning/jit_ppc.h,
	include/lightning/jit_s390x.h, include/lightning/jit_sparc.h,
	include/lightning/jit_x86.h: Change jit_regset_t to an
	unsigned type, to allow safe right shift.

	* lib/lightning.c: Rewrite jit_regset_scan1 to allow easier
	compiler optimization.
This commit is contained in:
pcpa 2014-02-19 14:38:14 -03:00
parent b1d3217b63
commit 6e75c0352d
11 changed files with 33 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

12
ChangeLog
View file

@ -1,3 +1,15 @@
2014-19-02 Paulo Andrade <pcpa@gnu.org>
* include/lightning/jit_aarch64.h, include/lightning/jit_arm.h,
include/lightning/jit_hppa.h, include/lightning/jit_ia64.h,
include/lightning/jit_mips.h, include/lightning/jit_ppc.h,
include/lightning/jit_s390x.h, include/lightning/jit_sparc.h,
include/lightning/jit_x86.h: Change jit_regset_t to an
unsigned type, to allow safe right shift.
* lib/lightning.c: Rewrite jit_regset_scan1 to allow easier
compiler optimization.
2013-12-03 Paulo Andrade <pcpa@gnu.org>
* lib/jit_x86-x87.c: Correct wrong optimization when

2
include/lightning/jit_aarch64.h
View file

@ -90,6 +90,6 @@ typedef enum {
#define JIT_NOREG _NOREG
} jit_reg_t;
typedef jit_int64_t jit_regset_t;
typedef jit_uint64_t jit_regset_t;
#endif /* _jit_aarch64_h */

2
include/lightning/jit_arm.h
View file

@ -123,7 +123,7 @@ typedef struct {
jit_uint32_t ldrt_strt : 1;
} jit_cpu_t;
typedef jit_int64_t jit_regset_t;
typedef jit_uint64_t jit_regset_t;
/*
* Initialization

2
include/lightning/jit_hppa.h
View file

@ -133,6 +133,6 @@ typedef enum {
_NOREG,
} jit_reg_t;
typedef jit_int64_t jit_regset_t;
typedef jit_uint64_t jit_regset_t;
#endif /* _jit_hppa */

8
include/lightning/jit_ia64.h
View file

@ -118,10 +118,10 @@ typedef enum {
} jit_reg_t;
typedef struct {
jit_int64_t rl;
jit_int64_t rh;
jit_int64_t fl;
jit_int64_t fh;
jit_uint64_t rl;
jit_uint64_t rh;
jit_uint64_t fl;
jit_uint64_t fh;
} jit_regset_t;
#endif /* _jit_ia64_h */

2
include/lightning/jit_mips.h
View file

@ -119,6 +119,6 @@ typedef enum {
_NOREG,
} jit_reg_t;
typedef jit_int64_t jit_regset_t;
typedef jit_uint64_t jit_regset_t;
#endif /* _jit_mips_h */

2
include/lightning/jit_ppc.h
View file

@ -103,6 +103,6 @@ typedef enum {
#define JIT_NOREG _NOREG
} jit_reg_t;
typedef jit_int64_t jit_regset_t;
typedef jit_uint64_t jit_regset_t;
#endif /* _jit_ppc_h */

2
include/lightning/jit_s390x.h
View file

@ -67,6 +67,6 @@ typedef enum {
#define JIT_NOREG _NOREG
} jit_reg_t;
typedef jit_int32_t jit_regset_t;
typedef jit_uint32_t jit_regset_t;
#endif /* _jit_s390x_h */

2
include/lightning/jit_sparc.h
View file

@ -65,6 +65,6 @@ typedef enum {
_NOREG,
} jit_reg_t;
typedef jit_int64_t jit_regset_t;
typedef jit_uint64_t jit_regset_t;
#endif /* _jit_sparc_h */

4
include/lightning/jit_x86.h
View file

@ -139,9 +139,9 @@ typedef struct {
} jit_cpu_t;
#if __WORDSIZE == 32
typedef jit_int32_t jit_regset_t;
typedef jit_uint32_t jit_regset_t;
#else
typedef jit_int64_t jit_regset_t;
typedef jit_uint64_t jit_regset_t;
#endif
/*

11
lib/lightning.c
View file

@ -496,10 +496,15 @@ jit_regset_scan1(jit_regset_t *set, jit_int32_t offset)
unsigned long
jit_regset_scan1(jit_regset_t *set, jit_int32_t offset)
{
jit_regset_t mask;
assert(offset >= 0 && offset <= 63);
for (; offset < 64; offset++) {
if (*set & (1LL << offset))
return (offset);
if ((mask = *set >> offset)) {
for (;;) {
if (mask & 1)
return (offset);
mask >>= 1;
++offset;
}
}
return (ULONG_MAX);
}