https://llvm.org/bugs/show_bug.cgi?id=26244
Bug ID: 26244
Summary: LLVM ERROR: Cannot select (@llvm.maxnum.v2f32)
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: rahulchaud...@chromium.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15684
--> https://llvm.org/bugs/attachment.cgi?id=15684&action=edit
Reproducer
See the attached reduced.ll file.
$ llc reduced.ll
LLVM ERROR: Cannot select: t4: v2f32 = fmaxnum t20, undef:v2f32
t20: v2f32 = bitcast t19
t19: v2i32 = ARMISD::VMOVIMM TargetConstant:i32<0>
t18: i32 = TargetConstant<0>
t1: v2f32 = undef
In function: foo
Using llvm/clang from tip-of-trunk (as of 01/20/2016).
This issue was found while trying to build Chrome browser for Chrome OS. The
(reduced) set of flags used to compile the original c++ file were:
clang++ \
-cc1 \
-triple thumbv7-cros-linux-gnueabi \
-target-cpu cortex-a8 \
-target-feature +fp-armv8 \
-vectorize-slp \
-std=gnu++11 \
-emit-obj \
-O2 \
test.cpp
Removing the "-vectorize-slp" flag lets the compile go through.
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