The following patch introduces bunch of checks for usage of sp and pc registers as operands for thumb instructions: http://sourceware.org/ml/binutils/2009-01/msg00363.html
In particular, it rejects, for example, the following two instructions: addw sp, sp, #0 subw sp, sp, #0 here sp is used as destination register and this is perfectly allowed according to ARM documentation. Only pc as destination register lead to unpredictable results. See e.g. A8.6.215 SUB (SP minus immediate) of ARMv7-A / ARMv7-R Architecture Reference Manual. -- Summary: Too strict checks for addw / subw instructions Product: binutils Version: unspecified Status: NEW Severity: normal Priority: P2 Component: gas AssignedTo: unassigned at sources dot redhat dot com ReportedBy: asl at math dot spbu dot ru CC: bug-binutils at gnu dot org,joseph at codesourcery dot com GCC target triplet: arm-none-linux-gnueabi http://sourceware.org/bugzilla/show_bug.cgi?id=10479 ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. _______________________________________________ bug-binutils mailing list bug-binutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-binutils