freebsd-src/lib/msun/amd64/e_fmodf.S

/*
 * Based on the i387 version written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 */

#include <machine/asm.h>
ENTRY(fmodf)
	movss	%xmm0,-4(%rsp)
	movss	%xmm1,-8(%rsp)
	flds	-8(%rsp)
	flds	-4(%rsp)
1:	fprem
	fstsw	%ax
	testw	$0x400,%ax
	jne	1b
	fstps	-4(%rsp)
	movss	-4(%rsp),%xmm0
	fstp	%st
	ret
END(fmodf)

	.section .note.GNU-stack,"",%progbits
Add asm versions of fmod(), fmodf() and fmodl() on amd64. Add asm versions of fmodf() amd fmodl() on i387. fmod is similar to remainder, and the C versions are 3 to 9 times slower than the asm versions on x86 for both, but we had the strange mixture of all 6 variants of remainder in asm and only 1 of 6 variants of fmod in asm. 2016-09-04 12:22:14 +00:00			`/*`
			`* Based on the i387 version written by J.T. Conklin <jtc@netbsd.org>.`
			`* Public domain.`
			`*/`

			`#include <machine/asm.h>`
			`ENTRY(fmodf)`
			`movss %xmm0,-4(%rsp)`
			`movss %xmm1,-8(%rsp)`
			`flds -8(%rsp)`
			`flds -4(%rsp)`
			`1: fprem`
			`fstsw %ax`
			`testw $0x400,%ax`
			`jne 1b`
			`fstps -4(%rsp)`
			`movss -4(%rsp),%xmm0`
			`fstp %st`
			`ret`
			`END(fmodf)`

			`.section .note.GNU-stack,"",%progbits`