http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48604
Summary: [PowerPC] Wrong code with -frename-registers -Os Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target AssignedTo: unassig...@gcc.gnu.org ReportedBy: sebastian.hu...@embedded-brains.de Target: powerpc-rtems4.11-gcc Created attachment 23977 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23977 C source code corresponding to the assembler code. Creating an assembler file with powerpc-rtems4.11-gcc -S -frename-registers -Os qmmpagef.i generates wrong code. In fmm_setup_mmu_fn: .L20: addi 31,1,304 mr 3,28 b _restgpr_18_x .size fmm_setup_mmu_fn, .-fmm_setup_mmu_fn Usage of register 31 is wrong here, should be register 11. Compiling with -fno-rename-registers leads to valid code.