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Re: [avr-gcc-list] Bug found in __mulhi3 - was Is this possibly a bug in
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From: |
Marek Michalkiewicz |
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Subject: |
Re: [avr-gcc-list] Bug found in __mulhi3 - was Is this possibly a bug in avr-gcc ? |
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Date: |
Tue, 27 Mar 2001 21:22:28 +0200 (CEST) |
> ie, the function is performing 0x201 * 0x18
>
> The returned value is 0x18 instead of 0x3018 and is therefore incorrect.
The patch below fixes it for me, but I don't know why ;).
"ror" was supposed to set the Z flag correctly... Denis?
Marek
--- libgcc.S.orig Sun Jan 21 14:07:52 2001
+++ libgcc.S Tue Mar 27 21:16:27 2001
@@ -142,6 +142,7 @@
lsr r_arg1H ; gets LSB of multiplier
ror r_arg1L
+ cp r_arg1L,__zero_reg__
cpc r_arg1H,__zero_reg__
brne __mulhi3_loop ; exit if multiplier = 0
__mulhi3_exit: