[Bug target/40836] ICE: "insn does not satisfy its constraints" (iwmmxt_movsi_insn)

Sat Nov 28 23:08:00 GMT 2009

------- Comment #28 from enrico dot scholz at informatik dot tu-chemnitz dot de  2009-11-28 23:08 -------
Created an attachment (id=19173)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19173&action=view)
arm-linux-gnueabi-gcc -march=iwmmxt -mcpu=iwmmxt -mtune=iwmmxt -std=gnu99 -c
-O2 libc_fatal.i

Patch generates inefficient code; e.g. it emits now

     568:       ee183110        tmrc    r3, wcgr0
     56c:       e1a0d003        mov     sp, r3

which could be written directly as

     tmrc   sp, wcgr0

when allowing a ['rk','z'] constraint.

The new ICE mentioned in comment #20 still happens with this patch. But this
seems to be a dup of bug #37987 which exists for earlier gcc versions too.  I
attached a testcase for completeness.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40836