https://llvm.org/bugs/show_bug.cgi?id=23800
Bug ID: 23800
Summary: Invalid shufflevector operands
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 14452
--> https://llvm.org/bugs/attachment.cgi?id=14452&action=edit
Test-case with produces the wrong code
The following (OpenCL) code results in undef operands of a shufflevector LLVM
IR instruction when compiled with clang.
$ clang -S -emit-llvm -O0 -o - input.c
Clang and LLVM have been built from trunk. The bug does not occur with "Apple
LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)".
Test-case:
typedef unsigned int uint16 __attribute((ext_vector_type(16)));
typedef unsigned int uint8 __attribute((ext_vector_type(8)));
void test1(void) {
(uint16)(((uint16)0).s0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
}
Part of LLVM IR:
%5 = shufflevector <16 x i32> %3, <16 x i32> undef, <16 x i64> <i64 0, i64
undef, i64 undef, i64 undef, i64 undef, i64 undef, i64 undef, i64 undef, i64
undef, i64 undef, i64 undef, i64 undef, i64 undef, i64 undef, i64 undef, i64
undef>
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