[Bug target/48803] New: arm: Bad assembler produced by bit extract/shift

[david.gilbert at linaro dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48803

           Summary: arm: Bad assembler produced by bit extract/shift
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: david.gilbert@linaro.org


Created attachment 24123
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24123
Produces bad assembler

This was originally reported as Linaro-gcc bug in Launchpad here:
https://bugs.launchpad.net/gcc-linaro/+bug/771903

The attached small test case fails with the assembler error:
gcc -O3 arm_bit_extract.c
/tmp/ccOOK26S.s: Assembler messages:
/tmp/ccOOK26S.s:97: Error: bit-field extends past end of register -- `ubfx
r0,r0,#30,#10'

when compiled -O3 for ARMv7 on Ubuntu's gcc 4.5.2-8ubuntu1.
I'm told it also fails on vanilla 4.5.2

The shift that the source is trying to do is a bit bogus, however it shouldn't
produce bad assembler.

Dave