[LLVMbugs] [Bug 6552] [ARM inline asm] Assigning fp to a variable results in "Couldn't allocate output reg for constraint '{fp}'!"

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Mar 8 22:43:41 PST 2010


Anton Korobeynikov <asl at math.spbu.ru> changed:

           What    |Removed                     |Added
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |

--- Comment #2 from Anton Korobeynikov <asl at math.spbu.ru> 2010-03-09 00:43:41 CST ---
(In reply to comment #1)
> Trunk llvm-gcc does not produce that IR.  Instead if correctly diagnoses this
> as an error:
> test.c: In function 'foo':
> test.c:5: error: invalid register name for 'fp'
The error is not shown for me here (arm-eabi cross-compiler) - sound like some
apple-local stuff?

> The error message is pretty good in this case.   You need to specify the name
> of a specific register in this context and "fp" is not a register name.
No, it is a valid register name per ARM's specification. gcc accepts this code
as well.

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