aboutsummaryrefslogtreecommitdiffstats
path: root/sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S
diff options
context:
space:
mode:
authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-03-08 20:26:00 +0000
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-06-12 14:32:39 -0300
commit6427a6ac8cfe6c6e64214db606c5dced67213e8d (patch)
treeb8b52b884fe5960a75100042fa076f47e0df114a /sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S
parenta8c590f7896ab661df873e64ad0cbb559d399dbf (diff)
downloadglibc-6427a6ac8cfe6c6e64214db606c5dced67213e8d.tar.gz
glibc-6427a6ac8cfe6c6e64214db606c5dced67213e8d.tar.xz
glibc-6427a6ac8cfe6c6e64214db606c5dced67213e8d.zip
powerpc: Remove optimized isinf
The powerpc isinf optimizations onyl adds complexity: - GCC will call libm iff -fsignaling-nans is used. This usage pattern is usually not performance oriented and for such calls PLT overhead should dominate execution time. - The power7 uses ftdiv to optimize for some input pattern and branch implementation for INF and denormal that does: return (ix & UINT64_C (0x7fffffffffffffff)) == UINT64_C (0x7ff0000000000000) Although it does show slight better latency than generic algorithm (as below), it is only for power7 and requires it to override it for power8. - The power8 implementation is just the generic implementation using ISA 2.07 mfvsrd instruction (which GCC uses for generic implementation). So generic implementation is the best option for powerpc64le. Checked on powerpc-linux-gnu (built without --with-cpu, with --with-cpu=power4 and with --with-cpu=power5+ and --disable-multi-arch), powerpc64-linux-gnu (built without --with-cp and with --with-cpu=power5+ and --disable-multi-arch). * sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile (sysdeps_routines, libm-sysdep_routines): Remove s_isinf* and s_isinf* objects. * sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinf-power7.S: Remove file. * sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinf-ppc32.c: Likewise. * sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinf.c: Likewise. * sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinff-ppc32.c: Likewise. * sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_isinff.c: Likewise. * sysdeps/powerpc/powerpc32/power7/fpu/s_isinf.S: Likewise. * sysdeps/powerpc/powerpc32/power7/fpu/s_isinff.S: Likewise. * sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile (sysdep_call): Remove s_isinf* and s_isinf* objects. * sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf-power7.S: Likewise. * sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf-power8.S: Likewise. * sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf-ppc64.c: Likewise. * sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinf.c: Likewise. * sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinff-ppc64.c: Likewise. * sysdeps/powerpc/powerpc64/fpu/multiarch/s_isinff.c: Likewise. * sysdeps/powerpc/powerpc64/power7/fpu/s_isinf.S: Likewise. * sysdeps/powerpc/powerpc64/power7/fpu/s_isinff.S: Likewise. * sysdeps/powerpc/powerpc64/power8/fpu/s_isinf.S: Likewise. * sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S: Likewise. Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S')
-rw-r--r--sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S1
1 files changed, 0 insertions, 1 deletions
diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S b/sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S
deleted file mode 100644
index be759e091e8..00000000000
--- a/sysdeps/powerpc/powerpc64/power8/fpu/s_isinff.S
+++ /dev/null
@@ -1 +0,0 @@
-/* This function uses the same code as s_isinf.S. */