shithub: riscv

Info  •  Files  •  Log  •  Branches

realemu: cleanup opidiv

no need for switch here, just calculate the values. also fixes
6l warning about uninitialized min/max (compiler assumes none
of the case statements could match).

--- a/sys/src/cmd/aux/realemu/xec.c

+++ b/sys/src/cmd/aux/realemu/xec.c

@@ -799,21 +799,8 @@

 	q = n/d;

 	r = n%d;

-	/* check for overflow based on operand size */

-	switch(s) {

-	case 8:

-		min = (char)0x80;

-		max = 0x7F;

-		break;

-	case 16:

-		min = (short)0x8000;

-		max = 0x7FFF;

-		break;

-	case 32:

-		min = (long)0x80000000;

-		max = 0x7FFFFFFF;

-		break;

-	}

+	max = sign(s)-1;

+	min = ~max;

 	if(q > max || q < min)

 		trap(cpu, EDIV0);