http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48770
--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> 2011-04-26 14:57:08 UTC --- (gdb) disassemble ... 0x0000000000400d06 <+18>: addq $0x1,(%rax) 0x0000000000400d0a <+22>: mov $0x8,%eax 0x0000000000400d0f <+27>: test %edi,%edi 0x0000000000400d11 <+29>: jne 0x400d51 <test_goto2(int)+93> ... 0x0000000000400d50 <+92>: retq => 0x0000000000400d51 <+93>: mov (%rax),%rcx 0x0000000000400d54 <+96>: add $0x1,%rcx 0x0000000000400d58 <+100>: mov 0x202461(%rip),%rdx # 0x6031c0 0x0000000000400d5f <+107>: mov $0x1,%eax 0x0000000000400d64 <+112>: jmp 0x400d15 <test_goto2(int)+33> In the asm output, the problem is apparent (comparing trunk and 4.6 output) - the only difference is: 73,75c73,76 < mov rcx, QWORD PTR [rax] # *.LPBX1_I_lsm.7, *.LPBX1 < add rcx, 1 # *.LPBX1_I_lsm.7, < mov rdx, QWORD PTR .LPBX1[rip+32] # *.LPBX1_I_lsm.6, *.LPBX1 --- > lea rax, .LPBX1[rip+24] # tmp113, > mov rcx, QWORD PTR [rax] # *.LPBX1, *.LPBX1 > add rcx, 1 # *.LPBX1_I_lsm.4, > mov rdx, QWORD PTR .LPBX1[rip+32] # *.LPBX1_I_lsm.3, *.LPBX1 Instruction "lea" is missing, and rax contains value 8.
