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powerpc: Fix a corner case in __div64_32 

The code was incorrectly doing a division by 0 in the case where
the denominator was 0x100000000 and the divisor was 0xffffffff.
Thanks to Fred Liu of Motorola for pointing this out.

Signed-off-by: Paul Mackerras <paulus@samba.org>
wifi-calibration
Paul Mackerras 2005-10-20 09:37:02 +10:00
parent a4bcc95a3a
commit 344480b997
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/lib/div64.S
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@ -33,9 +33,10 @@ _GLOBAL(__div64_32)
cntlzw r0,r5 # we are shifting the dividend right
li r10,-1 # to make it < 2^32, and shifting
srw r10,r10,r0 # the divisor right the same amount,
add r9,r4,r10 # rounding up (so the estimate cannot
addc r9,r4,r10 # rounding up (so the estimate cannot
andc r11,r6,r10 # ever be too large, only too small)
andc r9,r9,r10
addze r9,r9
or r11,r5,r11
rotlw r9,r9,r0
rotlw r11,r11,r0