gcc -fsanitize=alignment

gistfile1.txt

Running selected tests.
/home/mike/src/php-master/ext/pcre/pcrelib/sljit/sljitNativeX86_64.c:519:26: runtime error: store to misaligned address 0x000002e4b111 for type 'sljit_si', which requires 4 byte alignment
0x000002e4b111: note: pointer points here
 07 48 00  83 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00
              ^ 
/home/mike/src/php-master/ext/pcre/pcrelib/sljit/sljitNativeX86_64.c:342:19: runtime error: store to misaligned address 0x000002e4b186 for type 'sljit_si', which requires 4 byte alignment
0x000002e4b186: note: pointer points here
 fe 06 48 3d 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00
             ^ 
/home/mike/src/php-master/ext/pcre/pcrelib/sljit/sljitNativeX86_64.c:546:24: runtime error: store to misaligned address 0x000002e4b29d for type 'sljit_si', which requires 4 byte alignment
0x000002e4b29d: note: pointer points here
 07 48 00 c6 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
             ^ 
/home/mike/src/php-master/ext/pcre/pcrelib/sljit/sljitNativeX86_64.c:58:24: runtime error: store to misaligned address 0x7fcaa4eb2264 for type 'sljit_sw', which requires 8 byte alignment
0x7fcaa4eb2264: note: pointer points here
  8b f8 49 b9 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
              ^ 
/home/mike/src/php-master/ext/pcre/pcrelib/sljit/sljitNativeX86_common.c:535:28: runtime error: store to misaligned address 0x7fcaa4eb208e for type 'sljit_si', which requires 4 byte alignment
0x7fcaa4eb208e: note: pointer points here
 3b c7 0f 83 00 00  00 00 48 0f b6 08 48 83  f9 2d 74 00 48 83 c0 01  eb 00 48 89 44 24 30 48  89 5c
             ^ 
/home/mike/src/php-master/ext/pcre/pcrelib/sljit/sljitNativeX86_64.c:222:20: runtime error: store to misaligned address 0x000002e609f5 for type 'sljit_si', which requires 4 byte alignment
0x000002e609f5: note: pointer points here
 07 48 81 ec 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
             ^ 
/home/mike/src/php-master/ext/pcre/pcrelib/sljit/sljitNativeX86_64.c:295:20: runtime error: store to misaligned address 0x000002e60dad for type 'sljit_si', which requires 4 byte alignment
0x000002e60dad: note: pointer points here
 07 48 81 c4 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
             ^