1998-06-09 18:24:13 +00:00
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/*
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* Written by Ulrich Drepper <drepper@cygnus.com>.
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*/
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#include <machine/asm.h>
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2015-09-18 21:53:22 +00:00
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#include <i386-math-asm.h>
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1998-06-09 18:24:13 +00:00
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2015-09-18 21:53:22 +00:00
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DEFINE_DBL_MIN
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2015-09-15 16:50:02 +00:00
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#ifdef PIC
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# define MO(op) op##@GOTOFF(%ecx)
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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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1998-06-09 18:24:13 +00:00
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/* 10^x = 2^(x * log2(10)) */
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ENTRY(__ieee754_exp10)
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2015-09-15 16:50:02 +00:00
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#ifdef PIC
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LOAD_PIC_REG (cx)
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#endif
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1998-06-09 18:24:13 +00:00
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fldl 4(%esp)
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/* I added the following ugly construct because exp(+-Inf) resulted
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in NaN. The ugliness results from the bright minds at Intel.
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For the i686 the code can be written better.
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-- drepper@cygnus.com. */
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fxam /* Is NaN or +-Inf? */
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fstsw %ax
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movb $0x45, %dh
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andb %ah, %dh
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cmpb $0x05, %dh
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je 1f /* Is +-Inf, jump. */
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fldl2t
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fmulp /* x * log2(10) */
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fld %st
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frndint /* int(x * log2(10)) */
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fsubr %st,%st(1) /* fract(x * log2(10)) */
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fxch
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f2xm1 /* 2^(fract(x * log2(10))) - 1 */
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fld1
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faddp /* 2^(fract(x * log2(10))) */
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fscale /* e^x */
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fstp %st(1)
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2015-09-18 21:53:22 +00:00
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DBL_NARROW_EVAL_UFLOW_NONNEG_NAN
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ret
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1998-06-09 18:24:13 +00:00
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1: testl $0x200, %eax /* Test sign. */
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jz 2f /* If positive, jump. */
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fstp %st
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fldz /* Set result to 0. */
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2: ret
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END (__ieee754_exp10)
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2011-10-12 15:27:51 +00:00
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strong_alias (__ieee754_exp10, __exp10_finite)
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