mirror of git://sourceware.org/git/glibc.git
c055c54e96
The SSE4.1 provides a direct instruction for trunc, which improves modf/modff performance with a less text size. On Ryzen 9 (zen3) with gcc 14.2.1: x86_64-v2 reciprocal-throughput master patch difference workload-0_1 7.9610 7.7914 2.13% workload-1_maxint 9.4323 7.8021 17.28% workload-maxint_maxfloat 8.7379 7.8049 10.68% workload-integral 7.9492 7.7991 1.89% latency master patch difference workload-0_1 7.9511 10.8910 -36.97% workload-1_maxint 15.8278 10.9048 31.10% workload-maxint_maxfloat 11.3495 10.9139 3.84% workload-integral 11.5938 10.9071 5.92% x86_64-v3 reciprocal-throughput master patch difference workload-0_1 8.7522 7.9781 8.84% workload-1_maxint 9.6690 7.9872 17.39% workload-maxint_maxfloat 8.7634 7.9857 8.87% workload-integral 8.7397 7.9893 8.59% latency master patch difference workload-0_1 8.7447 9.5589 -9.31% workload-1_maxint 13.7480 9.5690 30.40% workload-maxint_maxfloat 10.0092 9.5680 4.41% workload-integral 9.7518 9.5743 1.82% For x86_64-v1 the optimization is done through a new ifunc selector. The avx is to follow other SSE4_1 optimization (like trunc) to avoid the ifunc for x86_64-v3. Checked on x86_64-linux-gnu. Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com> |
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