[llvm-bugs] [Bug 13803] llvm-mc treats .n suffix as .w suffix for ADC

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Aug 17 04:22:41 PDT 2015


John Brawn <john.brawn.123 at gmail.com> changed:

           What    |Removed                     |Added
             Status|RESOLVED                    |REOPENED
                 CC|                            |john.brawn.123 at gmail.com
         Resolution|INVALID                     |---

--- Comment #2 from John Brawn <john.brawn.123 at gmail.com> ---
The syntax for encoding T1 is ADC{S}<c>.W, but the assembler syntax for ADC
(immediate) is

  ADC{S}{<c>}{<q>} {<Rd>,} <Rn>, #<const>

where <q> is .N or .W (page A8-301 of the ARMv7-A/R ARMARM revision C.c).

In the ARMARM the .W suffix is listed in the encoding if it's necessary to
distinguish it from other encodings, but in the assembly syntax it's permitted
even when it's not needed to distinguish between encodings (see section A8.2
"Standard assembler syntax fields").

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