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[avr-libc-dev] [bug #40003] Integer type promotion leads to inefficent c
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From: |
Joey Morin |
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Subject: |
[avr-libc-dev] [bug #40003] Integer type promotion leads to inefficent code in wdt.h |
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Date: |
Wed, 11 Sep 2013 15:23:28 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:20.0) Gecko/20100101 Firefox/20.0 |
Follow-up Comment #1, bug #40003 (project avr-libc):
Forgot to add an example:
In the case of wdt_enable(WDTO_15MS), the assembled output for targets such as
the ATtiny85:
ldi r18, 0x08
ldi r24, 0x18
ldi r25, 0x00
in r0, 0x3f
cli
wdr
out 0x21, r24
out 0x3f, r0
out 0x21, r18
With the patch in place:
ldi r25, 0x08
ldi r24, 0x18
in r0, 0x3f
cli
wdr
out 0x21, r24
out 0x3f, r0
out 0x21, r25
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