[LLVMbugs] [Bug 11947] New: Bad code generated for armv6, thumb. Access of float struct member mixed up.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11947

             Bug #: 11947
           Summary: Bad code generated for armv6, thumb. Access of float
                    struct member mixed up.
           Product: clang
           Version: 3.0
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: clang at nikopol.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Code from an iOS project:

    // ...
    for (UITouch* touch in touches) {
        CGPoint p0 = [touch previousLocationInView:nil];
        NSLog(@"%f, %f", p0.x, p0.y);
    }
    // ...

Above code always prints the same value for p0.x and p0.y even when they really
differ.

I tried to reduce the problem to a single file/small project, but it went away.
So I have this ~25 files Xcode project which has the error. I can provide the
project if anyone would be interested to investigate.

The problem only occurs when -Os -mthumb -arch armv6.

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