.syntax unified - VCMP immediate still requires #

[Dan Lewis]

The assembler directive, ".syntax unified" allows immediate constants to be written without a leading "#". However, I've found one exception:

VCMP.F32 S0,0.0

which causes a syntax error, while adding the "#" eliminates the error:

VCMP.F32 S0,#0.0

This apparently does not affect ALL of the floating-point instructions, since the VMOV immediates work fine without the leading "#":

VMOV S0,0.0

[Thomas Preud'homme (thomas-preudhomme)]

Hi Dan,

The # sign is mandatory for immediate constants. The fact that the assembler is more lax in some cases is a bug and should not be relied upon.

Best regards.

[Dan Lewis (danielwlewis)]

Thomas,

It's not a matter of being lax. It's permitted by .syntax unified:

https://sourceware.org/binutils/docs/as/ARM_002dInstruction_002dSet.html#ARM_002dInstruction_002dSet

Best,

Dan

[Carlos Antunes (cmantunes)]

Thomas,

With all due respect, I believe you are wrong as shown in the link provided by Dan.

Carlos

[Thomas Preud'homme (thomas-preudhomme)]

My apologize. I was checking the ARM Architecture Reference Manual. Indeed the documentation does allow it.

[Dan Lewis (danielwlewis)]

No problem. :-)

Have a nice day!

Dan