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Some CLZ for other toolchains.

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This commit is contained in:
Dale Weiler 2014-05-24 20:33:57 -04:00
parent edb38ce70e
commit 4fa694fe82
2 changed files with 38 additions and 6 deletions
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39
fold.c
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@ -73,11 +73,44 @@ typedef struct {
sfloat_tdetect_t tiny; sfloat_tdetect_t tiny;
} sfloat_state_t; } sfloat_state_t;
/* Count of leading zero bits before the most-significand 1 bit. */
#ifdef _MSC_VER
/* MSVC has an intrinsic for this */
static GMQCC_INLINE uint32_t sfloat_clz(uint32_t x) {
int r = 0;
_BitScanForward(&r, x);
return r;
}
# define SFLOAT_CLZ(X, SUB) \
(sfloat_clz((X)) - (SUB))
#elif defined(__GNUC__) || defined(__CLANG__)
/* Clang and GCC have a builtin for this */
# define SFLOAT_CLZ(X, SUB) \
(__builtin_clz((X)) - (SUB))
#else
/* Native fallback */
static GMQCC_INLINE uint32_t sfloat_popcnt(uint32_t x) {
x -= ((x >> 1) & 0x55555555);
x = (((x >> 2) & 0x33333333) + (x & 0x33333333));
x = (((x >> 4) + x) & 0x0F0F0F0F);
x += x >> 8;
x += x >> 16;
return x & 0x0000003F;
}
static GMQCC_INLINE uint32_t sfloat_clz(uint32_t x) {
x |= (x >> 1);
x |= (x >> 2);
x |= (x >> 4);
x |= (x >> 8);
x |= (x >> 16);
return 32 - sfloat_popcnt(x);
}
# define SFLOAT_CLZ(X, SUB) \
(sfloat_clz((X) - (SUB)))
#endif
/* The value of a NaN */ /* The value of a NaN */
#define SFLOAT_NAN 0xFFC00000 #define SFLOAT_NAN 0xFFC00000
/* Count of leading zero bits before the most-significand 1 bit. */
#define SFLOAT_CLZ(X, SUB) \
(__builtin_clz((X)) - (SUB))
/* Test if NaN */ /* Test if NaN */
#define SFLOAT_ISNAN(A) \ #define SFLOAT_ISNAN(A) \
(0xFF000000 < (uint32_t)((A) << 1)) (0xFF000000 < (uint32_t)((A) << 1))

5
tests/inexact.qc
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@ -1,7 +1,6 @@
const float a = 1.0 / 3.0;
const float b = 0.33333333333;
void main() { void main() {
const float a = 1.0 / 3.0;
const float b = 0.33333333333;
if (a == b) { if (a == b) {
// Should trigger warning // Should trigger warning
} }