http://llvm.org/bugs/show_bug.cgi?id=11319
Bug #: 11319
Summary: ARM instruction selection failure when
-promote-elements=true and -mattr=+neon
Product: new-bugs
Version: trunk
Platform: All
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 7582
--> http://llvm.org/bugs/attachment.cgi?id=7582
The test cases to reproduce the bug.
When we enable ARM NEON (-mattr=+neon) during the code generation, llc will
return either instruction selection failure or assertion failure on APInt bit
width in some circumstance (see the attached test cases).
After further inspection, we found that only if both of the following flags are
enabled will the bug occur:
(a) -mattr=+neon : This flag enables the code generation for ARM NEON
instruction.
(b) -promote-elements=true : This flag enables some vector type to vector type
promotion during the legalization process. This flag has been enabled by
default since revision 142152.
PROCEDURE TO REPRODUCE:
1. Fetch and build the LLVM.
2. Download the attached test case, extract the files, and place them in
<llvm>/test/CodeGen/ARM
3. Run "make check". The expected behavior is that no additional unexpected
test failure is discovered. But there will be 6 additional test failures after
adding the attached test cases.
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