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glibc/sysdeps/powerpc/fpu/math-use-builtins-trunc.h

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powerpc: Remove modff optimization The generic implementation is slight more optimized than the powerpc one, where it has a more optimized inf/nan check (by not using FP unit checks, along with branch prediction hints), and removed one branch by issuing trunc instead of a combination of floor/ceil (which also generated less code). On power10 with gcc 14.2.1: reciprocal-throughput master patch difference workload-0_1 1.5210 1.3942 8.34% workload-1_maxint 2.0926 1.3940 33.38% workload-maxint_maxfloat 1.7851 1.3940 21.91% workload-integral 1.5216 1.3941 8.37% latency master patch difference workload-0_1 1.5928 2.6337 -65.35% workload-1_maxint 3.2929 2.6337 20.02% workload-maxint_maxfloat 1.9697 2.6341 -33.73% workload-integral 2.0597 2.6337 -27.87% Checked on powerpc64le-linux-gnu. Reviewed-by: Sachin Monga <smonga@linux.ibm.com>
2025-06-16 13:17:35 +00:00
#define USE_TRUNC_BUILTIN 0
#ifdef _ARCH_PWR5X
# define USE_TRUNCF_BUILTIN 1
#else
# define USE_TRUNCF_BUILTIN 0
#endif
#define USE_TRUNCL_BUILTIN 0
#define USE_TRUNCF128_BUILTIN 0