http://llvm.org/bugs/show_bug.cgi?id=9964
Summary: ARM Thumb 2: MOV R0, R1 does not work
Product: libraries
Version: trunk
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM assembly language parser
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
I have to use MOVS R0, R1.
This would be fine, except I can't use that with immediates.
For inline assembler in Clang this is something of a problem for me. :)
Be nice to be able to use the same instruction for both..
GCC allows asm("mov r0, r1") just fine. Maybe ARM Thumb had
this restriction? ARM Thumb 2 certainly does not.
The error is "error: instruction requires a CPU feature not currently enabled".
Command line is clang -cc1 -emit-obj -target-cpu cortex-m3 -triple
thumb-none-eabi (or thumb-gcc) test.c
clang -cc1 -S of course does not object. It's definitely an assembler problem.
Thanks
James
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