http://llvm.org/bugs/show_bug.cgi?id=19115
Bug ID: 19115
Summary: clang generates 26 times as much instructions as gcc
for code with a variable length array
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12216
--> http://llvm.org/bugs/attachment.cgi?id=12216&action=edit
test1.c
A variable length array in a function blocks possible dead code elimination if
used with clang.
clang generates 53 instructions for test1.c, but
my gcc of 4.9-20131229_0 generates only two instructions.
I know that if
...
size_t swap[size];
...
is replaced by
...
size_t swap[2];
...
then the generated code is eliminated also in clang.
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