[Bug middle-end/112510] Regression: ASAN code injection breaks alignment of stack variables
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112510 --- Comment #7 from Vladimir Sadovnikov --- Disassembly for GCC 11.4.0: ``` 11e9 <_Z13gate_x1_curvePfPKfPKN3dsp11gate_knee_tEm>: 11e9: f3 0f 1e fa endbr64 11ed: 55 push %rbp 11ee: 48 89 e5mov%rsp,%rbp 11f1: 41 57 push %r15 11f3: 41 56 push %r14 11f5: 41 55 push %r13 11f7: 41 54 push %r12 11f9: 53 push %rbx 11fa: 48 83 e4 c0 and$0xffc0,%rsp 11fe: 48 81 ec c0 03 00 00sub$0x3c0,%rsp 1205: 49 89 fcmov%rdi,%r12 1208: 49 89 f5mov%rsi,%r13 120b: 49 89 d7mov%rdx,%r15 120e: 49 89 cemov%rcx,%r14 1211: 48 8d 5c 24 20 lea0x20(%rsp),%rbx 1216: 48 89 5c 24 18 mov%rbx,0x18(%rsp) 121b: 83 3d ee 2d 00 00 00cmpl $0x0,0x2dee(%rip)# 4010 <__asan_option_detect_stack_use_after_return@@Base> 1222: 0f 85 65 01 00 00 jne138d <_Z13gate_x1_curvePfPKfPKN3dsp11gate_knee_tEm+0x1a4> 1228: 48 c7 03 b3 8a b5 41movq $0x41b58ab3,(%rbx) 122f: 48 8d 05 d2 0d 00 00lea0xdd2(%rip),%rax# 2008 <_IO_stdin_used+0x8> 1236: 48 89 43 08 mov%rax,0x8(%rbx) 123a: 48 8d 05 a8 ff ff fflea-0x58(%rip),%rax# 11e9 <_Z13gate_x1_curvePfPKfPKN3dsp11gate_knee_tEm> 1241: 48 89 43 10 mov%rax,0x10(%rbx) 1245: 48 89 d8mov%rbx,%rax 1248: 48 c1 e8 03 shr$0x3,%rax 124c: c7 80 00 80 ff 7f f1movl $0xf1f1f1f1,0x7fff8000(%rax) 1253: f1 f1 f1 1256: c7 80 08 80 ff 7f f2movl $0xf2f2f2f2,0x7fff8008(%rax) 125d: f2 f2 f2 1260: c7 80 1c 80 ff 7f f2movl $0xf2f2f2f2,0x7fff801c(%rax) 1267: f2 f2 f2 126a: c7 80 20 80 ff 7f f2movl $0xf2f2f2f2,0x7fff8020(%rax) 1271: f2 f2 f2 1274: c7 80 64 80 ff 7f f3movl $0xf3f3f3f3,0x7fff8064(%rax) 127b: f3 f3 f3 127e: c7 80 68 80 ff 7f f3movl $0xf3f3f3f3,0x7fff8068(%rax) 1285: f3 f3 f3 1288: c7 80 6c 80 ff 7f f3movl $0xf3f3f3f3,0x7fff806c(%rax) 128f: f3 f3 f3 1292: 64 48 8b 14 25 28 00mov%fs:0x28,%rdx 1299: 00 00 129b: 48 89 94 24 b8 03 00mov%rdx,0x3b8(%rsp) 12a2: 00 12a3: 31 d2 xor%edx,%edx 12a5: 62 d2 7d 48 18 07 vbroadcastss (%r15),%zmm0 12ab: 62 d2 7d 48 18 4f 01vbroadcastss 0x4(%r15),%zmm1 12b2: 62 d2 7d 48 18 57 02vbroadcastss 0x8(%r15),%zmm2 12b9: 62 d2 7d 48 18 5f 03vbroadcastss 0xc(%r15),%zmm3 12c0: 62 d2 7d 48 18 67 04vbroadcastss 0x10(%r15),%zmm4 12c7: 62 d2 7d 48 18 6f 05vbroadcastss 0x14(%r15),%zmm5 12ce: 62 d2 7d 48 18 77 06vbroadcastss 0x18(%r15),%zmm6 12d5: 62 d2 7d 48 18 7f 07vbroadcastss 0x1c(%r15),%zmm7 12dc: 62 f1 7c 48 29 83 20vmovaps %zmm0,0x120(%rbx) 12e3: 01 00 00 12e6: 62 f1 7c 48 29 8b 60vmovaps %zmm1,0x160(%rbx) 12ed: 01 00 00 12f0: 62 f1 7c 48 29 93 a0vmovaps %zmm2,0x1a0(%rbx) 12f7: 01 00 00 12fa: 62 f1 7c 48 29 9b e0vmovaps %zmm3,0x1e0(%rbx) 1301: 01 00 00 1304: 62 f1 7c 48 29 a3 20vmovaps %zmm4,0x220(%rbx) 130b: 02 00 00 130e: 62 f1 7c 48 29 ab 60vmovaps %zmm5,0x260(%rbx) 1315: 02 00 00 1318: 62 f1 7c 48 29 b3 a0vmovaps %zmm6,0x2a0(%rbx) 131f: 02 00 00 1322: 62 f1 7c 48 29 bb e0vmovaps %zmm7,0x2e0(%rbx) 1329: 02 00 00 ``` Here we have offsets multiple of 0x20 but not multiple of 0x40 but missing strange load of %rbx from stack. It is reasonable because of this instruction: ``` 1211: 48 8d 5c 24 20 lea0x20(%rsp),%rbx ``` All works fine. gcc --version gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0 Copyright (C) 2021 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[Bug middle-end/112510] Regression: ASAN code injection breaks alignment of stack variables
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112510 --- Comment #6 from Vladimir Sadovnikov --- Here is disassembly of `test.cpp` function for GCC 7.5.0: ``` 00400727 <_Z13gate_x1_curvePfPKfPKN3dsp11gate_knee_tEm>: 400727: 4c 8d 54 24 08 lea0x8(%rsp),%r10 40072c: 48 83 e4 c0 and$0xffc0,%rsp 400730: 41 ff 72 f8 push -0x8(%r10) 400734: 55 push %rbp 400735: 48 89 e5mov%rsp,%rbp 400738: 41 57 push %r15 40073a: 41 56 push %r14 40073c: 41 55 push %r13 40073e: 41 54 push %r12 400740: 41 52 push %r10 400742: 53 push %rbx 400743: 48 81 ec 80 03 00 00sub$0x380,%rsp 40074a: 49 89 fcmov%rdi,%r12 40074d: 49 89 f5mov%rsi,%r13 400750: 49 89 d7mov%rdx,%r15 400753: 49 89 cemov%rcx,%r14 400756: 48 8d 9d 50 fc ff fflea-0x3b0(%rbp),%rbx 40075d: 83 3d 1c 19 00 00 00cmpl $0x0,0x191c(%rip)# 402080 <__asan_option_detect_stack_use_after_return@@Base> 400764: 0f 85 32 01 00 00 jne40089c <_Z13gate_x1_curvePfPKfPKN3dsp11gate_knee_tEm+0x175> 40076a: 48 c7 03 b3 8a b5 41movq $0x41b58ab3,(%rbx) 400771: 48 c7 43 08 f8 0c 40movq $0x400cf8,0x8(%rbx) 400778: 00 400779: 48 c7 43 10 27 07 40movq $0x400727,0x10(%rbx) 400780: 00 400781: 48 89 dfmov%rbx,%rdi 400784: 48 c1 ef 03 shr$0x3,%rdi 400788: c7 87 00 80 ff 7f f1movl $0xf1f1f1f1,0x7fff8000(%rdi) 40078f: f1 f1 f1 400792: c7 87 04 80 ff 7f f1movl $0xf1f1f1f1,0x7fff8004(%rdi) 400799: f1 f1 f1 40079c: c7 87 0c 80 ff 7f f2movl $0xf2f2f2f2,0x7fff800c(%rdi) 4007a3: f2 f2 f2 4007a6: c7 87 20 80 ff 7f f2movl $0xf2f2f2f2,0x7fff8020(%rdi) 4007ad: f2 f2 f2 4007b0: c7 87 24 80 ff 7f f2movl $0xf2f2f2f2,0x7fff8024(%rdi) 4007b7: f2 f2 f2 4007ba: c7 87 68 80 ff 7f f3movl $0xf3f3f3f3,0x7fff8068(%rdi) 4007c1: f3 f3 f3 4007c4: c7 87 6c 80 ff 7f f3movl $0xf3f3f3f3,0x7fff806c(%rdi) 4007cb: f3 f3 f3 4007ce: 62 d2 7d 48 18 07 vbroadcastss (%r15),%zmm0 4007d4: 62 d2 7d 48 18 4f 01vbroadcastss 0x4(%r15),%zmm1 4007db: 62 d2 7d 48 18 57 02vbroadcastss 0x8(%r15),%zmm2 4007e2: 62 d2 7d 48 18 5f 03vbroadcastss 0xc(%r15),%zmm3 4007e9: 62 d2 7d 48 18 67 04vbroadcastss 0x10(%r15),%zmm4 4007f0: 62 d2 7d 48 18 6f 05vbroadcastss 0x14(%r15),%zmm5 4007f7: 62 d2 7d 48 18 77 06vbroadcastss 0x18(%r15),%zmm6 4007fe: 62 d2 7d 48 18 7f 07vbroadcastss 0x1c(%r15),%zmm7 400805: 62 f1 7c 48 29 43 05vmovaps %zmm0,0x140(%rbx) 40080c: 62 f1 7c 48 29 4b 06vmovaps %zmm1,0x180(%rbx) 400813: 62 f1 7c 48 29 53 07vmovaps %zmm2,0x1c0(%rbx) 40081a: 62 f1 7c 48 29 5b 08vmovaps %zmm3,0x200(%rbx) 400821: 62 f1 7c 48 29 63 09vmovaps %zmm4,0x240(%rbx) 400828: 62 f1 7c 48 29 6b 0avmovaps %zmm5,0x280(%rbx) 40082f: 62 f1 7c 48 29 73 0bvmovaps %zmm6,0x2c0(%rbx) 400836: 62 f1 7c 48 29 7b 0cvmovaps %zmm7,0x300(%rbx) ``` gcc --version gcc (SUSE Linux) 7.5.0 Copyright (C) 2017 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. As we see, there is no load of %rbx from stack and all offsets are multiple of 0x40.
[Bug middle-end/112510] Regression: ASAN code injection breaks alignment of stack variables
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112510 --- Comment #5 from Andrew Pinski --- Could also be caused by r8-1786-g7b97253879973d .
[Bug middle-end/112510] Regression: ASAN code injection breaks alignment of stack variables
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112510 --- Comment #4 from Andrew Pinski --- Looks like the first code generation change for this function is between GCC 7 and GCC 8. >It is not reproducible on other than ArchLinux systems with older compiler >because the compiler generates proper What compiler does the older one have?
