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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/101220] New: arm: iwmmxt2: generating bad assembler ?
Date: Sat, 26 Jun 2021 10:06:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101220

            Bug ID: 101220
           Summary: arm: iwmmxt2: generating bad assembler ?
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

For this C source code:


struct Node FirstNode_t;
struct Node {
  int Pi;
  int BestPi
} FirstNode() {
  FirstNode_t.Pi =3D FirstNode_t.BestPi =3D 0;
}

Compiled on a raspberry pi cross compiler like this:

$ /home/dcb/raspberrypi/results/bin/arm-linux-gnueabihf-gcc -c -O3
-march=3Diwmmxt2 -c bug731.c

does this:

/tmp/cccOc0OE.s: Assembler messages:
/tmp/cccOc0OE.s:25: Error: selected processor does not support `wldrd wr0,.=
L3'
in ARM mode
/tmp/cccOc0OE.s:28: Error: selected processor does not support `wstrd wr0,[=
r3]'
in ARM mode

Cross compiler is

$ /home/dcb/raspberrypi/results/bin/arm-linux-gnueabihf-gcc -v
Using built-in specs.
COLLECT_GCC=3D/home/dcb/raspberrypi/results/bin/arm-linux-gnueabihf-gcc
COLLECT_LTO_WRAPPER=3D/home/dcb/raspberrypi/results/libexec/gcc/arm-linux-g=
nueabihf/12.0.0/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: /home/dcb/gcc/trunk.git/configure
--prefix=3D/home/dcb/raspberrypi/results/ --target=3Darm-linux-gnueabihf
--enable-languages=3Dc,c++,fortran --with-arch=3Darmv6 --with-fpu=3Dvfp
--with-float=3Dhard --disable-multilib --enable-checking=3Ddf,extra,fold,rt=
l,yes
--with-pkgversion=3D7dcf139a2b8e1c53
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20210624 (experimental) (7dcf139a2b8e1c53)=