https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71657
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-06-26
Ever confirmed|0 |1
--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
This is another manifestation of spills to vec register problems.
[uros@localhost test]/ssd/uros/gcc-build-fast/gcc/cc1plus -O3 -quiet
-mtune=core2 crash_main.ii
[uros@localhost test]$ g++ crash_init.s crash_main.s
[uros@localhost test]$ ./a.out
terminate called after throwing an instance of 'std::out_of_range'
what(): vector::_M_range_check: __n (which is 13673958) >= this->size()
(which is 38)
Aborted (core dumped)
[uros@localhost test]$ /ssd/uros/gcc-build-fast/gcc/cc1plus -O3 -quiet
-mtune=core2 -mtune-ctrl=^general_regs_sse_spill crash_main.ii
[uros@localhost test]$ g++ crash_init.s crash_main.s
[uros@localhost test]$ ./a.out
The asm code in question is:
...
movl 32(%rsp), %eax
subl $38, %eax
movd %eax, %xmm0 <- spill to vec
.L29:
cmpl 8(%rsp), %r10d
jge .L19
movl %r10d, %ebp
subl 28(%rsp), %ebp
movd %xmm0, %eax <- fill from vec
xorl %r8d, %r8d
movl 8(%rsp), %r14d
leal (%rax,%r10), %r15d
leal -6(%r10), %r12d
movslq %r15d, %r15
leaq (%r15,%r15,2), %r11
movslq %ebp, %rbp
leaq 0(%rbp,%rbp,2), %rbx
salq $3, %r11
subl %r10d, %r14d
salq $3, %rbx
.p2align 4,,10
.p2align 3
.L24:
testl %esi, %esi
jle .L27
movq v0(%rip), %rdx
movq v0+8(%rip), %rax
subq %rdx, %rax
sarq $3, %rax
imulq %r9, %rax
cmpq %rbp, %rax
jbe .L25
leal (%r12,%r8), %ecx
addq %rbx, %rdx
movq (%rdx), %rax
movslq %ecx, %rcx
movq 8(%rdx), %rdi
leaq (%rcx,%rcx,2), %rcx
movslq %r8d, %rdx
subq %rax, %rdi
addq %r11, %rax
sarq $3, %rdi
movq %rax, %xmm0 <- *clobbering* spill to vec!
imulq %r9, %rdi
leaq 64(%rsp), %rax
addq %rax, %rcx
cmpq %rdi, %r15
jnb .L26
movq %xmm0, %rax <- fill from the above spill
movq (%rax), %rax
movzbl (%rax,%rdx,8), %edi
xorl %eax, %eax
.p2align 4,,10
.p2align 3
.L28:
movl %edi, %edx
subb (%rcx,%rax), %dl
movb %dl, 0(%r13,%rax)
addq $1, %rax
cmpl %eax, %esi
jg .L28
.L27:
addl $1, %r8d
cmpl %r14d, %r8d
jne .L24
.L19:
addl $2, 8(%rsp)
addl $2, %r10d
cmpl 16(%rsp), %r10d
jle .L29
...
