math: move trivial x86-family sqrt functions to C with inline asm

This commit is contained in:
Alexander Monakov 2020-01-06 19:35:57 +03:00 committed by Rich Felker
parent c24a992386
commit 41b290ba39
8 changed files with 28 additions and 18 deletions

7
src/math/i386/sqrtl.c Normal file
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#include <math.h>
long double sqrtl(long double x)
{
__asm__ ("fsqrt" : "+t"(x));
return x;
}

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.global sqrtl
.type sqrtl,@function
sqrtl: fldt 4(%esp)
fsqrt
ret

7
src/math/x86_64/sqrt.c Normal file
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#include <math.h>
double sqrt(double x)
{
__asm__ ("sqrtsd %1, %0" : "=x"(x) : "x"(x));
return x;
}

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.global sqrt
.type sqrt,@function
sqrt: sqrtsd %xmm0, %xmm0
ret

7
src/math/x86_64/sqrtf.c Normal file
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#include <math.h>
float sqrtf(float x)
{
__asm__ ("sqrtss %1, %0" : "=x"(x) : "x"(x));
return x;
}

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.global sqrtf
.type sqrtf,@function
sqrtf: sqrtss %xmm0, %xmm0
ret

7
src/math/x86_64/sqrtl.c Normal file
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#include <math.h>
long double sqrtl(long double x)
{
__asm__ ("fsqrt" : "+t"(x));
return x;
}

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@ -1,5 +0,0 @@
.global sqrtl
.type sqrtl,@function
sqrtl: fldt 8(%rsp)
fsqrt
ret