[LLVMbugs] [Bug 9134] New: register spilled to wrong location

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Feb 3 12:16:06 PST 2011


           Summary: register spilled to wrong location
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: SystemZ
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: bagel99 at gmail.com
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=6096)
 --> (http://llvm.org/bugs/attachment.cgi?id=6096)
test case

When registers are spilled around call sites, the first spill is to the wrong
stack offset.

The result of the test code produced by "llc -march=systemz" is:

zalloc:                                 # @zalloc
    stmg    %r14, %r15, 112(%r15)
    stg    %r2, 168(%r15)        # <--exceeds frame size
                    # spills to old %r15
    aghi    %r15, -184        # expand frame 160+24
    brasl    %r14, malloc
    stg    %r2, 160(%r15)        # superfluous but OK
    lg    %r4, 168(%r15)        # <--reload from new r15
    lghi    %r3, 0
    brasl    %r14, memset
    lg    %r1, 160(%r15)
    stg    %r1, 176(%r15)
    lg    %r2, 176(%r15)
    lmg    %r14, %r15, 296(%r15)
    br    %r14

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