https://bugs.llvm.org/show_bug.cgi?id=39914
Bug ID: 39914
Summary: Incorrect code when right shifting signed int by more
than its size
Product: clang
Version: 7.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: bugzi...@poradnik-webmastera.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
When signed int is shifted right by more than its width, results will be either
0 or -1. However clang always evaluates this as 0. Sample code below, compiled
with "-O3 -march=skylake-avx512".
[code]
void f();
void g();
void test(int n)
{
if (n >> 222)
f();
else
g();
}
[/code]
[asm]
test(int): # @test(int)
jmp g() # TAILCALL
[/asm]
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