[LLVMbugs] [Bug 571] NEW: InstrCombine problem
bugzilla-daemon at cs.uiuc.edu
bugzilla-daemon at cs.uiuc.edu
Sat Jun 4 05:34:34 PDT 2005
http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=571
Summary: InstrCombine problem
Product: libraries
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: major
Priority: P2
Component: Scalar Optimizations
AssignedTo: unassignedbugs at nondot.org
ReportedBy: alenhar2 at uiuc.edu
Reproducable in bzip2 with a different data set than the nightly tester uses:
./256.bzip2.cbe
/home/vadve/shared/benchmarks/speccpu2000/benchspec/CINT2000/256.bzip2/data/ref/input/input.source
10
> -; ModuleID = 'bugpoint-tooptimize.bc'
> +; ModuleID = 'bugpoint-optimized.bc'
> target endian = little
> target pointersize = 32
> "complex double" = type { double, double }
> @@ -497,8 +497,8 @@
> %tmp.226 = load int** %tt ; <int*> [#uses=1]
> %tmp.228 = getelementptr int* %tmp.226, int %
> tmp.190.reload ; <int*> [#uses=1]
> %tmp.229 = load int* %tmp.228 ; <int> [#uses=2]
> - %tmp.231109 = cast ubyte %tmp.225 to int ; <int>
> [#uses=1]
> - %tmp.233111 = setgt int %tmp.231109, 0 ; <bool>
> [#uses=1]
> + %tmp.225 = cast ubyte %tmp.225 to sbyte ; <sbyte>
> [#uses=1]
> + %tmp.233111 = setgt sbyte %tmp.225, 0 ; <bool>
> [#uses=1]
> br bool %tmp.233111, label %then.8.no_exit.6_crit_edge.exitStub,
> label %codeRepl9.exitStub
> }
>
> It needs to know that it may not reduce an unsigned comparison to a
> signed comparison of the same size .
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