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util,intel: move probably_float to common code

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This helper is generally useful when trying to prettyprint a 32-bit value, so
make it available to the rest of the tree.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Reviewed-by: Mary Guillemard <mary@mary.zone>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40021>
This commit is contained in:
Alyssa Rosenzweig 2026-02-20 21:14:31 -05:00 • committed by Marge Bot
parent 48c685ee39
commit da4296c27c
2 changed files with 25 additions and 26 deletions
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27
src/intel/decoder/intel_batch_decoder.c
View file

@ -183,31 +183,6 @@ ctx_disassemble_program(struct intel_batch_decode_ctx *ctx,
ctx->disassemble_program(ctx, ksp, short_name, name);
}
/* Heuristic to determine whether a uint32_t is probably actually a float
* (http://stackoverflow.com/a/2953466)
*/
static bool
probably_float(uint32_t bits)
{
int exp = ((bits & 0x7f800000U) >> 23) - 127;
uint32_t mant = bits & 0x007fffff;
/* +- 0.0 */
if (exp == -127 && mant == 0)
return true;
/* +- 1 billionth to 1 billion */
if (-30 <= exp && exp <= 30)
return true;
/* some value with only a few binary digits */
if ((mant & 0x0000ffff) == 0)
return true;
return false;
}
static void
ctx_print_buffer(struct intel_batch_decode_ctx *ctx,
struct intel_batch_decode_bo bo,
@ -232,7 +207,7 @@ ctx_print_buffer(struct intel_batch_decode_ctx *ctx,
}
fprintf(ctx->fp, column_count == 0 ? " " : " ");
if ((ctx->flags & INTEL_BATCH_DECODE_FLOATS) && probably_float(*dw))
if ((ctx->flags & INTEL_BATCH_DECODE_FLOATS) && util_is_probably_float(*dw))
fprintf(ctx->fp, " %8.2f", *(float *) dw);
else
fprintf(ctx->fp, " 0x%08x", *dw);

24
src/util/u_math.h
View file

@ -873,6 +873,30 @@ util_is_sint16(int x)
return x >= INT16_MIN && x <= INT16_MAX;
}
/* Heuristic to determine whether a uint32_t is probably actually a float
* (http://stackoverflow.com/a/2953466)
*/
static inline bool
util_is_probably_float(uint32_t bits)
{
int exp = ((bits & 0x7f800000U) >> 23) - 127;
uint32_t mant = bits & 0x007fffff;
/* +- 0.0 */
if (exp == -127 && mant == 0)
return true;
/* +- 1 billionth to 1 billion */
if (-30 <= exp && exp <= 30)
return true;
/* some value with only a few binary digits */
if ((mant & 0x0000ffff) == 0)
return true;
return false;
}
#ifdef __cplusplus
}
#endif