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--- a/gcc/config/avr32/lib1funcs.S
+++ b/gcc/config/avr32/lib1funcs.S
@@ -1852,7 +1852,11 @@ __avr32_f64_div_res_subnormal:/* Divide
mov r10, 0
ldm sp++, r0, r1, r2, r3, r4, r5, r6, r7,pc
-17: /* Return INF. */
+17:
+ /* Check if op1 is zero. */
+ or r4, r10, r11
+ breq __avr32_f64_div_op1_zero
+ /* Return INF. */
mov r11, lr /*Get correct sign*/
andh r11, 0x8000, COH
orh r11, 0x7ff0
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