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Add narrowing of modulo operator.

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This commit is contained in:
Mike Pall
2011-06-03 18:48:02 +02:00
parent eec28aa9fd
commit 8c5935000d
9 changed files with 76 additions and 16 deletions
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14
src/lj_vmmath.c
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@@ -39,6 +39,20 @@ double lj_vm_exp2(double a)
}
#endif
#if !LJ_TARGET_ARM
int32_t LJ_FASTCALL lj_vm_modi(int32_t a, int32_t b)
{
uint32_t y, ua, ub;
lua_assert(b != 0); /* This must be checked before using this function. */
ua = a < 0 ? -(uint32_t)a : (uint32_t)a;
ub = b < 0 ? -(uint32_t)b : (uint32_t)b;
y = ua % ub;
if (y != 0 && (a^b) < 0) y = y - ub;
if (((int32_t)y^b) < 0) y = -y;
return (int32_t)y;
}
#endif
#if !LJ_TARGET_X86ORX64
/* Unsigned x^k. */
static double lj_vm_powui(double x, uint32_t k)