darawin

src/libmp/386/mpdigdiv-Darwin.s

@@ -0,0 +1,33 @@
+.text
+.p2align 2,0x90
+.globl _mpdigdiv
+_mpdigdiv:
+	/* Prelude */
+	pushl %ebp		/* save on stack */
+	pushl %ebx
+	
+	leal 12(%esp), %ebp	/* %ebp = FP for now */
+	movl 0(%ebp), %ebx	/* dividend */
+	movl 0(%ebx), %eax
+	movl 4(%ebx), %edx
+	movl 4(%ebp), %ebx	/* divisor */
+	movl 8(%ebp), %ebp	/* quotient */
+
+	xorl	%ecx, %ecx
+	cmpl	%ebx, %edx		/* dividend >= 2^32 * divisor */
+	jae	divovfl
+	cmpl	%ecx, %ebx		/* divisor == 1 */
+	je	divovfl
+	divl	%ebx		/* AX = DX:AX/BX */
+	movl	%eax, (%ebp)
+done:
+	/* Postlude */
+	popl %ebx
+	popl %ebp
+	ret
+
+	/* return all 1's */
+divovfl:
+	notl	%ecx
+	movl	%ecx, (%ebp)
+	jmp done