http://llvm.org/bugs/show_bug.cgi?id=22371
Bug ID: 22371
Summary: invalid vectorization of fcmp oge and friends
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Trying llvm3.6rc1 with Numba, I get crashes on some vectorized code for ordered
comparisons.
For a loop running "fcmp oge" over an array of doubles, generated assembly
looks like this (x86-64):
.align 8
.LCPI0_0:
.quad 4607182418800017408
.text
.globl "__main__.fn.float64.float64.array(float64,_1d,_C,_nonconst)"
.align 16, 0x90
.type
"__main__.fn.float64.float64.array(float64,_1d,_C,_nonconst)",@function
"__main__.fn.float64.float64.array(float64,_1d,_C,_nonconst)":
movq 32(%rdx), %r8
testq %r8, %r8
jle .LBB0_19
movq 24(%rdx), %rcx
cmplesd %xmm0, %xmm1
movabsq $.LCPI0_0, %rax
andpd (%rax), %xmm1
[snip]
The "andpd (%rax), %xmm1" crashes. AFAIU, that's because $.LCPI0_0 is not
16-byte aligned.
A quick look with gdb seems to confirm that hypothesis:
(gdb) info registers rax
rax 0x7ffff7fea058 140737354047576
(gdb) x/2 0x7ffff7fea058
0x7ffff7fea058: 0x00000000 0x3ff00000
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