[LLVMbugs] [Bug 9962] New: MultiSource/Applications/JM/ldecod fails with -verify-coalescing on x86_64

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu May 19 22:56:26 PDT 2011


           Summary: MultiSource/Applications/JM/ldecod fails with
                    -verify-coalescing on x86_64
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: zwarich at apple.com
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=6621)
 --> (http://llvm.org/bugs/attachment.cgi?id=6621)

block.c from MultiSource/Applications/JM/ldecod fails with -verify-coalescing
on x86_64. I've attached a reduction. This is the failure:

*** Bad machine code: Illegal virtual register for instruction ***
- function:    intrapred_luma_16x16
- basic block: for.end428 0x7fbca9834508 (BB#10) [560L;672L)
- instruction: 576L    %vreg14<def> = LEA64_32r %vreg24<kill>, 4, %vreg24, 32,
%noreg; GR32:%vreg14,%vreg24,%vreg24
- operand 3:   %vreg24
Expected a GR32_NOSP register, but got a GR32 register

It looks like a bug in cross-class coalescing.

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