[llvm-bugs] [Bug 24649] New: r244578 broke x86 codegen for -Oz

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24649

            Bug ID: 24649
           Summary: r244578 broke x86 codegen for -Oz
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: glider at google.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

For the following testcase:

$ cat compress.c
static int zisofs_readpage() {
  struct page *pages[({    (1 << (*(unsigned char *)(0xfeedface)) );    } )];
  return zisofs_uncompress_block(0, 0, 0, 0, pages, 0, 0);
}
int (*readpage)() = zisofs_readpage;

Clang r244578 reports an error when compiling with -Oz and -no-integrated-as:

$ clang -target x86_64-cros-linux-gnu  -no-integrated-as -Oz -w   -c  
compress.c
/tmp/compress-1e6ca5.s: Assembler messages:
/tmp/compress-1e6ca5.s:35: Error: operand type mismatch for `pop'
/tmp/compress-1e6ca5.s:36: Error: operand type mismatch for `pop'
clang-3.8: error: assembler command failed with exit code 1 (use -v to see
invocation)

The same testcase compiles fine with Clang r244577.
It also compiles with r244578 if either -Oz or -no-integrated-as is removed
from the command line.

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