[Bug 1234060] Re: Wrong code generation for -march=armv7-a -thumb (Found during GMP bulild)

[Kugan Vivekanandarajah]

Generated code is wrong due to the output template of the patterns
(please see below).  Commit 201250 Fixes it.

243.dfinish
=============
(insn 62 61 63 2 (set (reg:SI 3 r3 [orig:156 _qh ] [156])
        (plus:SI (plus:SI (geu:SI (reg:CC 100 cc)
                    (const_int 0 [0]))
                (reg:SI 3 r3 [orig:151 D.4776 ] [151]))
            (reg/v:SI 1 r1 [orig:110 __x3 ] [110]))) test.c:44 18 {*addsi3_carryin_alt2_geu}
     (expr_list:REG_DEAD (reg:CC 100 cc)
        (expr_list:REG_DEAD (reg/v:SI 1 r1 [orig:110 __x3 ] [110])
            (nil))))

Generated Wrong Code
===============
adc	r3, r3	@ 62	*addsi3_carryin_alt2_geu/1	[length = 4]

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Title:
  Wrong code generation for -march=armv7-a -thumb (Found during GMP
  bulild)

Status in Linaro GCC:
  New
Status in “gcc-4.8” package in Ubuntu:
  Confirmed
Status in “gcc-4.8” source package in Saucy:
  Confirmed

Bug description:
  Attached testcase fails in -march=armv7-a -thumb for -O1 but works for
  -O0

  gcc trunk  however is working with -O1 (and above).

  arm-none-linux-gnueabi-gcc -v
  Using built-in specs.
  COLLECT_GCC=/home/kugan/work/builds/gcc-linaro-4.8/tools/bin/arm-none-linux-gnueabi-gcc
  COLLECT_LTO_WRAPPER=/home/kugan/work/builds/gcc-linaro-4.8/tools/libexec/gcc/arm-none-linux-gnueabi/4.8.2/lto-wrapper
  Target: arm-none-linux-gnueabi
  Configured with: /home/kugan/work/sources/gcc-linaro/4.8/configure --target=arm-none-linux-gnueabi --prefix=/home/kugan/work/builds/gcc-linaro-4.8/tools --with-sysroot=/home/kugan/work/builds/gcc-linaro-4.8/sysroot-arm-none-linux-gnueabi --disable-libssp --disable-libgomp --disable-libmudflap --enable-languages=c,c++ --with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=softfp --with-thumb
  Thread model: posix
  gcc version 4.8.2 20130920 (prerelease) (Linaro GCC release=4.8-2013.09-1~dev)

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