[LLVMbugs] [Bug 3080] New: LegalizeTypes unconditionally produces addc/ adde nodes for shl x, 1

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Mon Nov 17 05:49:17 PST 2008


           Summary: LegalizeTypes unconditionally produces addc/adde nodes
                    for shl x, 1
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: richard at xmos.com
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=2212)
 --> (http://llvm.org/bugs/attachment.cgi?id=2212)
Proposed patch

Running llc -march=xcore on the following:

define i64 @test(i64 %a) {
        %result = shl i64 %a, 1
        ret i64 %result

results in the following failure:

Cannot yet select: 0x161b958: i32,flag = adde 0x161bf58, 0x161bf58, 0x161c058:1

It looks like the problem lies in LegalizeTypes: it shouldn't generate
ADDC/ADDE nodes if they are not supported by the target. A patch to fix this is

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