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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
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11
lib/lightning.c
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@ -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);
}