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220622dde5
This patch adds a new macro, libm_alias_finite, to define all _finite symbol. It sets all _finite symbol as compat symbol based on its first version (obtained from the definition at built generated first-versions.h). The <fn>f128_finite symbols were introduced in GLIBC 2.26 and so need special treatment in code that is shared between long double and float128. It is done by adding a list, similar to internal symbol redifinition, on sysdeps/ieee754/float128/float128_private.h. Alpha also needs some tricky changes to ensure we still emit 2 compat symbols for sqrt(f). Passes buildmanyglibc. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
91 lines
1.4 KiB
ArmAsm
91 lines
1.4 KiB
ArmAsm
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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*
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* Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
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* Adapted for x86-64 by Andreas Jaeger <aj@suse.de>
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*
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* Correct handling of y==-inf <drepper@gnu>
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*/
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#include <machine/asm.h>
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#include <libm-alias-finite.h>
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.section .rodata
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.align ALIGNARG(4)
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.type zero_nan,@object
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zero_nan:
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.double 0.0
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nan: .byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f
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.byte 0, 0, 0, 0, 0, 0, 0, 0x80
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.byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f
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ASM_SIZE_DIRECTIVE(zero_nan)
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#ifdef PIC
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# define MO(op) op##(%rip)
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#else
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# define MO(op) op
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#endif
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.text
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ENTRY(__ieee754_scalbl)
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fldt 24(%rsp)
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fxam
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fnstsw
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fldt 8(%rsp)
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andl $0x4700, %eax
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cmpl $0x0700, %eax
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je 1f
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andl $0x4500, %eax
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cmpl $0x0100, %eax
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je 2f
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fxam
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fnstsw
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andl $0x4500, %eax
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cmpl $0x0100, %eax
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je 2f
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fld %st(1)
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frndint
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fcomip %st(2), %st
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jne 4f
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fscale
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fstp %st(1)
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ret
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/* y is -inf */
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1: fxam
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fnstsw
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movl 16(%rsp), %edx
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shrl $5, %eax
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fstp %st
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fstp %st
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andl $0x8000, %edx
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andl $0x0228, %eax
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cmpl $0x0028, %eax
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je 4f
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andl $8, %eax
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shrl $11, %edx
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addl %edx, %eax
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#ifdef PIC
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lea zero_nan(%rip),%rdx
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fldl (%rdx,%rax,1)
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#else
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fldl zero_nan(%rax, 1)
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#endif
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ret
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/* The result is NaN; raise an exception for sNaN arguments. */
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2: faddp
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ret
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/* Return NaN and raise the invalid exception. */
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4: fstp %st
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fstp %st
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fldz
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fdiv %st
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ret
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END(__ieee754_scalbl)
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libm_alias_finite (__ieee754_scalbl, __scalbl)
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