nextInt assembly before and after (original.s/nextIntA is master cubiomes, new.s/nextIntB is PR stuff)

new.s

nextIntB:
	pushq	%rbp
	.seh_pushreg	%rbp
	pushq	%rbx
	.seh_pushreg	%rbx
	subq	$72, %rsp
	.seh_stackalloc	72
	leaq	64(%rsp), %rbp
	.seh_setframe	%rbp, 64
	.seh_endprologue
	movq	%rcx, 32(%rbp)
	movl	%edx, 40(%rbp)
	movl	40(%rbp), %eax
	subl	$1, %eax
	movl	%eax, -4(%rbp)
	movl	-4(%rbp), %eax
	andl	40(%rbp), %eax
	testl	%eax, %eax
	jne	.L9
	movl	40(%rbp), %eax
	movslq	%eax, %rbx
	movq	32(%rbp), %rax
	movl	$31, %edx
	movq	%rax, %rcx
	call	next
	cltq
	imulq	%rbx, %rax
	movq	%rax, -24(%rbp)
	movq	-24(%rbp), %rax
	sarq	$31, %rax
	jmp	.L10
.L9:
	movq	32(%rbp), %rax
	movl	$31, %edx
	movq	%rax, %rcx
	call	next
	movl	%eax, -8(%rbp)
	movl	-8(%rbp), %eax
	cltd
	idivl	40(%rbp)
	movl	%edx, -12(%rbp)
	movl	-8(%rbp), %edx
	movl	-12(%rbp), %eax
	subl	%eax, %edx
	movl	-4(%rbp), %eax
	addl	%edx, %eax
	testl	%eax, %eax
	js	.L9
	movl	-12(%rbp), %eax
.L10:
	addq	$72, %rsp
	popq	%rbx
	popq	%rbp
	ret

original.s

nextIntA:
	pushq	%rbp
	.seh_pushreg	%rbp
	pushq	%rbx
	.seh_pushreg	%rbx
	subq	$72, %rsp
	.seh_stackalloc	72
	leaq	64(%rsp), %rbp
	.seh_setframe	%rbp, 64
	.seh_endprologue
	movq	%rcx, 32(%rbp)
	movl	%edx, 40(%rbp)
	movl	40(%rbp), %eax
	subl	$1, %eax
	movl	%eax, -4(%rbp)
	movl	-4(%rbp), %eax
	andl	40(%rbp), %eax
	testl	%eax, %eax
	jne	.L6
	movl	40(%rbp), %eax
	movslq	%eax, %rbx
	movq	32(%rbp), %rax
	movl	$31, %edx
	movq	%rax, %rcx
	call	next
	cltq
	imulq	%rbx, %rax
	movq	%rax, -24(%rbp)
	movq	-24(%rbp), %rax
	sarq	$31, %rax
	jmp	.L7
.L6:
	movq	32(%rbp), %rax
	movl	$31, %edx
	movq	%rax, %rcx
	call	next
	movl	%eax, -8(%rbp)
	movl	-8(%rbp), %eax
	cltd
	idivl	40(%rbp)
	movl	%edx, -12(%rbp)
	movl	-8(%rbp), %eax
	subl	-12(%rbp), %eax
	movl	%eax, %edx
	movl	-4(%rbp), %eax
	addl	%edx, %eax
	testl	%eax, %eax
	js	.L6
	movl	-12(%rbp), %eax
.L7:
	addq	$72, %rsp
	popq	%rbx
	popq	%rbp
	ret