[llvm-bugs] [Bug 42469] New: PowerPC: inline assembly doesn't know the difference between altivec and vsx registers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42469

            Bug ID: 42469
           Summary: PowerPC: inline assembly doesn't know the difference
                    between altivec and vsx registers
           Product: new-bugs
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: slandden at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

AltiVec registers are differn't registers from VSX registers, and even when the
VSX register class ("wa"[1]) is specified to an inline assembly, gcc doesn't
put the variable in the right register

#include <altivec.h>
#include <stdint.h>
void store_unaligned(vector unsigned char vec, unsigned char *dest) {
uintptr_t zero = 0;

    __asm__ volatile ("stxvb16x %0, %1, %2\n\t"
      :
      : "wa" (vec), "r" (zero), "r" ((uintptr_t)dest));
}

compiled with clang -mvsx unaligned.c --save-temps -c -O3

store_unaligned:                        # @store_unaligned
.Lfunc_begin0:
# %bb.0:
        li 3, 0
        #APP
        stxvb16x 2, 3, 5 <=== clang needs to move it from vr3 to vs2, but
didn't

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