🚀 go-pugleaf

The following C program makes gcc produce wrong assembly code. It
should compute the substraction in long and coerce it to word or
am I wrong  ?

------------------------------------
void MakeName(char *, unsigned short, void *);


char buffer[10];


foo(void *ret)
{
	char *s;

	s = buffer + 10;

	MakeName(buffer, s - buffer, ret);
}

------------------------------------
	.file	"gccdump"
	.version	"GNU C 1.35"
gcc_compiled.:
 foo	.text
	.align 4
	.globl	foo
foo:
	pushl %ebp
	movl %esp,%ebp
	subl $4,%esp
	movl $buffer,%ecx
	addl $10,%ecx
	movl %ecx,-4(%ebp)
	pushl 8(%ebp)
*	movw -4(%ebp),%ax
*	movw $buffer,%dx
*	subw %dx,%ax
*	movzwl %ax,%eax
*	pushl %eax
	pushl $buffer
	call MakeName
.L1:
	leave
	ret
	.comm	buffer,10

time in parse: 0.033332
time in integration: 0.000000
time in jump: 0.000000
time in cse: 0.000000
time in loop: 0.000000
time in flow: 0.000000
time in combine: 0.000000
time in local-alloc: 0.000000
time in global-alloc: 0.016666
time in final: 0.016666
time in varconst: 0.000000
time in symout: 0.000000
time in dump: 0.000000