Hi,
I have an issue with the -Os optimization parameter in mspgcc 4.7.0
20120911.
The following code writes a byte to 0x18000 (in flash > 64 KB) on an
MSP430F5342:
#include <msp430f5342.h>
#include <stdint.h>
#include <string.h>
int main(){
uint8_t* addr=(uint8_t*)0x18000;
WDTCTL = WDTPW+WDTHOLD;
FCTL3 = FWKEY + LOCKA; // Clear LOCK and LOCKA
FCTL1 = FWKEY + ERASE; // Enable segment erase
*addr = 0; // Dummy write, erase the
selected segment
while(FCTL3 & BUSY); // Wait for erase to finish
FCTL1 = FWKEY + WRT; // Enable write
*addr = 0x88; // WRITE
while(FCTL3 & BUSY); // Wait for write to finish
FCTL1 = FWKEY; // Disable writes / erases
FCTL3 = FWKEY + LOCK + LOCKA; // Set LOCK and LOCKA
return 0;
}
It works fine when I compile it without -Os:
msp430-gcc -mmcu=msp430f5342 -mmemory-model=large test.c
But with -Os I get:
/tmp/ccANT1um.s: Assembler messages:
/tmp/ccANT1um.s:18: Error: value 98304 out of range for 16-bit immediate
/tmp/ccANT1um.s:23: Error: value 98304 out of range for 16-bit immediate
To identify the offending optimization parameter, I tried using all the
parameters that -Os is supposed to activate, as determined with
msp430-gcc -Os -Q --help=optimizers:
-falign-functions -falign-jumps -falign-labels -falign-loops
-fbranch-count-reg -fcaller-saves -fcombine-stack-adjustments -fcommon
-fcompare-elim -fcprop-registers -fcrossjumping -fcse-follow-jumps -fdce
-fdefer-pop -fdelete-null-pointer-checks -fdevirtualize -fdse
-fearly-inlining -fexpensive-optimizations -fforward-propagate -fgcse
-fgcse-lm -fguess-branch-probability -fif-conversion -fif-conversion2
-finline-atomics -finline-functions -finline-functions-called-once
-finline-small-functions -fipa-cp -fipa-profile -fipa-pure-const
-fipa-reference -fipa-sra -fivopts -fjump-tables -fmath-errno
-fmerge-constants -fmove-loop-invariants -fomit-frame-pointer
-foptimize-register-move -foptimize-sibling-calls -fpeephole -fpeephole2
-freg-struct-return -fregmove -frename-registers -freorder-blocks
-freorder-functions -frerun-cse-after-loop
-fsched-critical-path-heuristic -fsched-dep-count-heuristic
-fsched-group-heuristic -fsched-interblock -fsched-last-insn-heuristic
-fsched-rank-heuristic -fsched-spec -fsched-spec-insn-heuristic
-fsched-stalled-insns-dep -fshort-enums -fshrink-wrap -fsigned-zeros
-fsplit-ivs-in-unroller -fsplit-wide-types -fstrict-aliasing
-fthread-jumps -ftoplevel-reorder -ftrapping-math -ftree-bit-ccp
-ftree-builtin-call-dce -ftree-ccp -ftree-ch -ftree-copy-prop
-ftree-copyrename -ftree-cselim -ftree-dce -ftree-dominator-opts
-ftree-dse -ftree-forwprop -ftree-fre -ftree-loop-if-convert
-ftree-loop-im -ftree-loop-ivcanon -ftree-loop-optimize -ftree-phiprop
-ftree-pre -ftree-pta -ftree-reassoc -ftree-scev-cprop -ftree-sink
-ftree-slp-vectorize -ftree-sra -ftree-switch-conversion
-ftree-tail-merge -ftree-ter -ftree-vect-loop-version -ftree-vrp
-funit-at-a-time -fweb
But with these parameters the code compiles.
Unfortunately the executables get much bigger with these parameters than
with -Os, so using them as a workaround is not an option.
Any ideas on what might cause this problem?
Martin
--
Martin Zoller ? Tinynode <http://www.tinynode.com/> ? System Architect ?
Lausanne ? D: +41 21 510 11 81 ? F: +41 21 510 11 71 ?
martin.zol...@tinynode.com <mailto:martin.zol...@tinynode.com>
New postal address from 12/15/2012: Tinynode SA, Boulevard de Grancy
19A, 1006 Lausanne
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