http://llvm.org/bugs/show_bug.cgi?id=10963
Summary: [AVX] incorrect code generated for <8 x i8> vector
shuffle
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=7297)
--> (http://llvm.org/bugs/attachment.cgi?id=7297)
test case, part 1
The attached test case loads a vector of i8 values from memory
(0,1,2,3,4,5,6,7) and does a shuffle of them with shuffle indices
(2,3,4,5,6,7,0,1) (such that the result should be the same as the shuffle
indices). If I compile with a regular SSE target, I get the expected result:
% llc bug.ll -o bug.s && clang bug.c bug.s && ./a.out
2 3 4 5 6 7 0 1
But with avx, all of the values are wrong.
% llc -mattr=+avx bug.ll -o bug.s && clang bug.c bug.s && ./a.out
0 2 3 4 5 6 7 0
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