[Bug target/91886] New: [10 regression] powerpc64 impossible register constraint in asm

[nsz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91886

            Bug ID: 91886
           Summary: [10 regression] powerpc64 impossible register
                    constraint in asm
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nsz at gcc dot gnu.org
  Target Milestone: ---

this used to work for me:

double fmax(double x, double y)
{
        __asm__ ("xsmaxdp %x0, %x1, %x2" : "=ws"(x) : "ws"(x), "ws"(y));
        return x;
}

compiled to

fmax:
        xsmaxdp 1, 1, 2
        blr

now (gcc version 10.0.0 20190924) i get

fmax.c: In function 'fmax':
fmax.c:3:2: error: impossible constraint in 'asm'
    3 |  __asm__ ("xsmaxdp %x0, %x1, %x2" : "=ws"(x) : "ws"(x), "ws"(y));
      |  ^~~~~~~