setprelf.387

来自「数学运算库源码」· 387 代码 · 共 84 行

/* Set 80387 floating point hardware rounding precision */

	.file	"setprec.387"
	.version	"01.01"
.text
	.align 16

.globl sprec
sprec:
	pushl %ebp
	movl %esp,%ebp
	pushl %eax
	subl $4,%esp
	fstcw (%esp)
	fwait
	movl (%esp),%eax
	andl $0xfcff,%eax
	movl %eax,(%esp)
	fldcw (%esp)
	popl %eax
	popl %eax
	leave
	ret
.Lfe1:
	.size	sprec,.Lfe1-sprec
	.align 16

.globl dprec
dprec:
	pushl %ebp
	movl %esp,%ebp
	pushl %eax
	subl $4,%esp
	fstcw (%esp)
	fwait
	movl (%esp),%eax
	andl $0xfcff,%eax
/* trap on overflow */
/*	andl $0xfcf7,%eax */
	orl $0x200,%eax
	movl %eax,(%esp)
	fldcw (%esp)
	popl %eax
	popl %eax
	leave
	ret
.Lfe2:
	.size	dprec,.Lfe2-dprec
	.align 16

.globl ldprec
ldprec:
	pushl %ebp
	movl %esp,%ebp
	pushl %eax
	subl $4,%esp
	fstcw (%esp)
	fwait
	movl (%esp),%eax
	orl $0x300,%eax
	movl %eax,(%esp)
	fldcw (%esp)
	popl %eax
	popl %eax
	leave
	ret
.Lfe3:
	.size	ldprec,.Lfe3-ldprec

	.align 16
.globl getprec
getprec:
	pushl %ebp
	movl %esp,%ebp
	subl $4,%esp
	fstcw (%esp)
	fwait
	movl (%esp),%eax
	leave
	ret
.Lfe4:
	.size	getprec,.Lfe4-getprec