https://llvm.org/bugs/show_bug.cgi?id=30987
Bug ID: 30987
Summary: Wrong code/bug at -O2 on x86_64-unknown-freebsd11.0
Product: clang
Version: trunk
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: m...@mikaelsimonsson.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17581
--> https://llvm.org/bugs/attachment.cgi?id=17581&action=edit
Test case
Using latest snapshot of Clang on FreeBSD: 4.0.d20161003
% clang++-devel -v
clang version 4.0.0
Target: x86_64-unknown-freebsd11.0
Thread model: posix
InstalledDir: /usr/local/llvm-devel/bin
% clang++39 -v
clang version 3.9.0 (tags/RELEASE_390/final)
Target: x86_64-unknown-freebsd11.0
Thread model: posix
InstalledDir: /usr/local/llvm39/bin
% clang++-devel -O2 -std=c++1z -stdlib=libc++ b.cc
-O1 or lower works on both versions, -O2 or -O3 does not. Code works on gcc7
with all optimization levels.
Sorry about the large test case, tried to simplify as much as I could.
Expected output:
1
Actual output (or similar):
-121
-120
-119
No match: -121
0
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