[Bug inline-asm/26408] New: incorrect handling of x86 "H" registers in inline asm

[sabre at nondot dot org]

Consider:

short test(int X, int Y) {
   register char Yr asm("ch") = Y;
   __asm__("foo %0 %1 %2" : "=r"(X): "r"(X), "r"(Yr));
   return X;
}

This compiles to:

test:
        movl    4(%esp), %edx
        movb    8(%esp), %cl
#APP
        foo %eax %edx %cl
#NO_APP
        cwtl
        ret

I would expect CH, not CL, to be used.

-Chris


-- 
           Summary: incorrect handling of x86 "H" registers in inline asm
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sabre at nondot dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26408