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target/9766: thumb mode produces an arm instruction with -Os
- From: dmeggy at techsol dot ca
- To: gcc-gnats at gcc dot gnu dot org
- Date: 19 Feb 2003 23:25:59 -0000
- Subject: target/9766: thumb mode produces an arm instruction with -Os
- Reply-to: dmeggy at techsol dot ca
>Number: 9766
>Category: target
>Synopsis: thumb mode produces an arm instruction with -Os
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Wed Feb 19 23:26:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: dmeggy at techsol dot ca
>Release: unknown-1.0
>Organization:
>Environment:
arm-linux
>Description:
try compiling the following function with the following options to gcc 3.2.2 "-Os -mthumb -c -o dave.o dave.c"
static int dave(const char *s) {
unsigned long matchmap[8];
return (int)matchmap[(unsigned char)*s++/32]; }
it produces a load register function that uses the stack pointer (i.e. a register above r7, which is invalid in thumb mode)
>How-To-Repeat:
try compiling the above function
>Fix:
Take off -Os optimization
>Release-Note:
>Audit-Trail:
>Unformatted: