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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/powerpc32/power7/fpu/s_isinf.S
parenta8c590f7896ab661df873e64ad0cbb559d399dbf (diff)
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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/powerpc32/power7/fpu/s_isinf.S')
-rw-r--r--sysdeps/powerpc/powerpc32/power7/fpu/s_isinf.S85
1 files changed, 0 insertions, 85 deletions
diff --git a/sysdeps/powerpc/powerpc32/power7/fpu/s_isinf.S b/sysdeps/powerpc/powerpc32/power7/fpu/s_isinf.S
deleted file mode 100644
index 9cd45eb4289..00000000000
--- a/sysdeps/powerpc/powerpc32/power7/fpu/s_isinf.S
+++ /dev/null
@@ -1,85 +0,0 @@
-/* isinf(). PowerPC32/POWER7 version.
- Copyright (C) 2010-2019 Free Software Foundation, Inc.
- Contributed by Luis Machado <luisgpm@br.ibm.com>.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <sysdep.h>
-#include <math_ldbl_opt.h>
-
-/* int __isinf(x) */
- .section .rodata.cst8,"aM",@progbits,8
- .align 3
-.LC0: /* 1.0 */
- .quad 0x3ff0000000000000
-
- .section ".text"
- .type __isinf, @function
- .machine power7
-ENTRY (__isinf)
-#ifdef SHARED
- mflr r11
- cfi_register(lr,r11)
-
- SETUP_GOT_ACCESS(r9,got_label)
- addis r9,r9,.LC0-got_label@ha
- lfd fp0,.LC0-got_label@l(r9)
-
- mtlr r11
- cfi_same_value (lr)
-#else
- lis r9,.LC0@ha
- lfd fp0,.LC0@l(r9)
-#endif
- ftdiv cr7,fp1,fp0
- li r3,0
- bflr 29 /* If not INF, return. */
-
- /* Either we have +INF or -INF. */
-
- stwu r1,-16(r1) /* Allocate stack space. */
- stfd fp1,8(r1) /* Transfer FP to GPR's. */
- ori 2,2,0 /* Force a new dispatch group. */
- lhz r4,8+HISHORT(r1) /* Fetch the upper 16 bits of the FP value
- (biased exponent and sign bit). */
- addi r1,r1,16 /* Reset the stack pointer. */
- cmpwi cr7,r4,0x7ff0 /* r4 == 0x7ff0? */
- li r3,1
- beqlr cr7 /* EQ means INF, otherwise -INF. */
- li r3,-1
- blr
- END (__isinf)
-
-hidden_def (__isinf)
-weak_alias (__isinf, isinf)
-
-/* It turns out that the 'double' version will also always work for
- single-precision. */
-strong_alias (__isinf, __isinff)
-hidden_def (__isinff)
-weak_alias (__isinff, isinff)
-
-#ifdef NO_LONG_DOUBLE
-strong_alias (__isinf, __isinfl)
-weak_alias (__isinf, isinfl)
-#endif
-
-#if !IS_IN (libm)
-# if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
-compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0);
-compat_symbol (libc, isinf, isinfl, GLIBC_2_0);
-# endif
-#endif