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a8c590f789
- math.h will use compiler builtin for gcc 4.4 when built without
-fsignaling-nans and the builtin is expanded inline for all
support architectures. As an example, there is no intra isinf
call on libm for the architecture I checked, x86, arm, aarch64,
and powerpc.
- The resulting binary difference on 32 bits architecture is minimum
for the non hotspot symbol.
- It helps wordsize-64 architectures that use ldbl-opt.
- It add some code simplification with reduction of duplicated
implementations.
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/ieee754/dbl-64/wordsize-64/s_isinf.c: Move to ...
* sysdeps/ieee754/dbl-64/s_isinf.c: ... here and format code.
Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
35 lines
773 B
C
35 lines
773 B
C
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Changed to return -1 for -Inf by Ulrich Drepper <drepper@cygnus.com>.
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* Public domain.
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*/
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/*
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* isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0;
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* no branching!
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*/
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#include <math.h>
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#include <math_private.h>
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#include <ldbl-classify-compat.h>
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#include <shlib-compat.h>
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int
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__isinf (double x)
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{
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int64_t ix;
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EXTRACT_WORDS64 (ix,x);
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int64_t t = ix & UINT64_C (0x7fffffffffffffff);
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t ^= UINT64_C (0x7ff0000000000000);
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t |= -t;
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return ~(t >> 63) & (ix >> 62);
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}
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hidden_def (__isinf)
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weak_alias (__isinf, isinf)
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#ifdef NO_LONG_DOUBLE
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# if LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
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compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0);
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# endif
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weak_alias (__isinf, isinfl)
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#endif
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