[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 Ramana Radhakrishnan changed: What|Removed |Added CC||david.gilbert at linaro dot org -

[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 Carrot changed: What|Removed |Added Status|NEW |RESOLVED Resolution|

[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 --- Comment #10 from carrot at gcc dot gnu.org 2011-07-29 08:36:11 UTC --- Author: carrot Date: Fri Jul 29 08:35:59 2011 New Revision: 176917 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176917 Log: PR rtl-optimization/49799 * co

[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 --- Comment #9 from carrot at gcc dot gnu.org 2011-07-29 01:27:32 UTC --- Author: carrot Date: Fri Jul 29 01:27:29 2011 New Revision: 176911 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176911 Log: PR rtl-optimization/49799 * com

[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 --- Comment #8 from Carrot 2011-07-26 02:51:39 UTC --- (In reply to comment #7) > No, you miss the point. > > Internally we must not generate (ashift (reg) (const_int)) where the const is > negative. > > Note that your testcasegenerates a reg s

[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 --- Comment #7 from Richard Earnshaw 2011-07-25 09:45:51 UTC --- No, you miss the point. Internally we must not generate (ashift (reg) (const_int)) where the const is negative. Note that your testcasegenerates a reg shift.

[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 --- Comment #6 from Carrot 2011-07-25 09:25:22 UTC --- (In reply to comment #5) > We should never generate a shift of -1. Instead the code that does that > should > return (clobber const_int 0). I'm afraid this method may impact gcc too much.

[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 --- Comment #5 from Richard Earnshaw 2011-07-25 09:03:30 UTC --- We should never generate a shift of -1. Instead the code that does that should return (clobber const_int 0).

[Bug rtl-optimization/49799] gcc arm generates illegal sbfx instruction

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49799 Carrot changed: What|Removed |Added Component|target |rtl-optimization --- Comment #4 from Carrot 201