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[Bug target/40836] ICE: "insn does not satisfy its constraints" (iwmmxt_movsi_insn)
- From: "enrico dot scholz at informatik dot tu-chemnitz dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Nov 2009 23:08:11 -0000
- Subject: [Bug target/40836] ICE: "insn does not satisfy its constraints" (iwmmxt_movsi_insn)
- References: <bug-40836-3461@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- 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.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40836