https://bugs.kde.org/show_bug.cgi?id=444571
--- Comment #11 from Mark Wielaard <m...@klomp.org> --- yeah, the fedora 35 gcc generates: 6 char x = a[-1]; 0x000000001000071c <+48>: ld r9,32(r31) 0x0000000010000720 <+52>: lbz r9,-1(r9) 0x0000000010000724 <+56>: stb r9,40(r31) 0x0000000010000728 <+60>: li r9,0 which valgrind does catch: ==15687== Invalid read of size 1 ==15687== at 0x10000720: main (b.c:6) ==15687== Address 0x436003f is 1 bytes before a block of size 1 alloc'd ==15687== at 0x40A5344: malloc (vg_replace_malloc.c:380) ==15687== by 0x1000070F: main (b.c:5) I can replicate when using gcc -mcpu=power9 -g -o b b.c 6 char x = a[-1]; 0x000000001000071c <+48>: ld r9,32(r31) 0x0000000010000720 <+52>: addi r9,r9,-1 0x0000000010000724 <+56>: lxsibzx vs0,0,r9 0x0000000010000728 <+60>: addi r9,r31,40 0x000000001000072c <+64>: stxsibx vs0,0,r9 0x0000000010000730 <+68>: li r9,0 So I guess that the difference is the default -mcpu setting between gcc versions -- You are receiving this mail because: You are watching all bug changes.
