[LLVMbugs] [Bug 12926] New: Inline ARMv7 assembler

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed May 23 10:05:05 PDT 2012


             Bug #: 12926
           Summary: Inline ARMv7 assembler
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: kuehnelf at comcast.net
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The armv7 architecture should be able to deal with the armv6t2 instruction set
for moving 16 bit values.

// current clang inline assembler bug for: /usr/local/bin/clang -march=armv7
-ccc-host-triple arm-apple-darwin11 -c test.c
#ifdef __arm__
int test(void) {
    int val;
    asm (
      //"mov %[r0], #0xff \n\t"              // old ARM way for 1023 constant
      //"orr %[r0], %[r0], #0x300 \n\t"
      "movw %[r0], #1023 \n\t"             // new ARMv6T2 way for 16 bit wide
      "movt %[r0], #0 \n\t"
      :  [r0] "=r" (val)
  return val;

Currently this results in an error:
test.c:8:7: error: instruction requires: armv6t2
      "movw %[r0], #1023 \n\t"             // new ARMv6T2 way for 16 bit wide
<inline asm>:1:2: note: instantiated into assembly here
        movw r0, #1023

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