Re: V4L2: __ucmpdi2 undefined on ppc
From: Segher Boessenkool <hidden>
Date: 2008-03-02 21:53:37
quoted
+/* + * __ucmpdi2: 64-bit comparison + * + * R3/R4 has 64 bit value A + * R5/R6 has 64 bit value B + * result in R3: 0 for A < B + * 1 for A == B + * 2 for A > B + */ +_GLOBAL(__ucmpdi2) + cmplw r7,r3,r5 # compare high words + li r3,0 + blt r7,2f # a < b ... return 0 + bgt r7,1f # a > b ... return 2 + cmplw r6,r4,r6 # compare low words + blt r6,2f # a < b ... return 0 + li r3,1 + ble r6,2f # a = b ... return 1 +1: li r3,2 +2: blr
Every occurrence of r7 here is wrong (and some of the r6). Is there any reason to do this in assembler code at all? Segher