[llvm-bugs] [Bug 29061] New: Inline assembly: 1 byte passed with constraint S" moved into DH instead of ESI

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29061

            Bug ID: 29061
           Summary: Inline assembly: 1 byte passed with constraint S"
                    moved into DH instead of ESI
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: philipp.kloke at web.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

This code

void test(char c)
{
    __asm__("" : : "S"(c));
}


creates this disassembled output:

00000000 <test>:
   0:   56                      push   %esi
   1:   8a 74 24 08             mov    0x8(%esp),%dh
   5:   5e                      pop    %esi
   6:   c3                      ret

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