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Optimized expression produces bad assembler code

Reproducible: Always
Steps to Reproduce:
1. source file follows
2.
3.
	

Actual Results:  $ cc -O /tmp/test.c
/tmp/cc6qpTmE.s: Assembler messages:
/tmp/cc6qpTmE.s:32: Error: `%al' not allowed with `cmpw'


Expected Results:  no errors...

typedef struct {
    int a[100];
    unsigned char b;
} a_t;

void load_a (a_t *a_p) {
    int i; for (i=0;i<100;i++) a_p->a[i]=i; a_p->b = 101;
}

void test_a (a_t *a_p, unsigned b) {
    if (((char) ((a_p->b) - (b))) < 0) a_p->b = b;
}

main () {
    a_t a;
    load_a(&a); test_a(&a,30);
}