http://llvm.org/bugs/show_bug.cgi?id=8482
Summary: arm_neon.h contains wrong definition of vshl
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Headers
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=5676)
--> (http://llvm.org/bugs/attachment.cgi?id=5676)
example
In Clang's arm_neon.h, the definitions of vshl_u* are wrong.
According to ARM's document [1], the shift amount parameter is
*always* signed, even for unsigned values, since a negative shift
means right shift.
I believe the header should be changed to conform to ARM's specification.
[1]
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491a/BABDFGBJ.html
Compile example:
$ clang -ccc-host-triple armv7a-none-eabi -ccc-gcc-name arm-none-eabi-gcc
-mfloat-abi=hard -w -emit-llvm -S vshl.c
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