target/9766: thumb mode produces an arm instruction with -Os

[dmeggy@techsol.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@techsol.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: