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: unassig...@gcc.gnu.org
ReportedBy: david.gilb...@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
