[llvm-bugs] [Bug 31837] New: [PowerPC][InlineAsm][Altivec] Cannot map altivec registers to VSX registers using %x

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31837

            Bug ID: 31837
           Summary: [PowerPC][InlineAsm][Altivec] Cannot map altivec
                    registers to VSX registers using %x
           Product: clang
           Version: trunk
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bruno.rosa at eldorado.org.br
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17923
  --> https://llvm.org/bugs/attachment.cgi?id=17923&action=edit
Test case

The attached test case compiles with gcc-6. Clang complains about invalid
operands for xxpermdi:

clang-3.9 -Werror -Wall -std=c99 -save-temps -g -maltivec test.c -o test
error: invalid operand in inline asm: 'vor $0,$1,$2
        xxpermdi ${0:x},${1:x},${2:x},3
        ' at line 571687

The idea here is to use an Altivec register for both Altivec and VSX
instructions. When using it in a VSX instruction, a given reg vN (e.g. v0)
should be referenced as vs(N+32) (e.g. vs32).

The assembly generated by gcc:
 vor 13,1,0
 xxpermdi 45,33,32,3

(v13 <=> vs45, v1 <=> vs33, v0 <=> vs32).

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