[LLVMdev] Hang in InstCombiner::DoOneIteration

[David Majnemer]

Hi Rob,

I'm pretty sure this was r222040, r222265, and r224097.

I'd try trunk.

On Wed, Feb 11, 2015 at 8:00 PM, Rob Grapes <Rob.Grapes at umajin.com> wrote:

> Hi,
>
> I'm hoping someone here can help me.
>
> I've just updated to LLVM 3.5.0 and when I run the following I eventually
> get a crash when I run out of memory.
>
> opt -O2 bug.ll
>
> I'll try 3.5.1, then if that's still fails I'll try trunk.
>
> It seems to be related to the
>   %5 = fptrunc double %4 to float
> line which is continually being added to the work list.
>
> Rob.
>
>
>
> bug.ll contains the following:
>
> ; ModuleID = 'bug.u'
> target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
> target triple = "i686-pc-windows-msvc"
>
> %string = type { i8*, i8* }
> %vec3 = type { float, float, float }
> %var = type { i32, i64 }
>
> %object = type { i8*, %string, %string, i8* }
>
> @hue = global double 0.000000e+00
>
> ; Function Attrs: noinline nounwind
> declare double @rand__d__v() #0
>
> ; Function Attrs: noinline nounwind
> declare %vec3* @vec3__PZ4vec3__fff(float, float, float) #0
>
> ; Function Attrs: noinline nounwind
> define i32 @main__i__v() #0 {
> locals:
>   br label %entry
>
> entry:                                            ; preds = %locals
>
>   %0 = call double @rand__d__v() #1
>   store double %0, double* @hue
>
>   %1 = load double* @hue
>   %2 = fadd double %1, 0x3FE3C6EF372FE951
>   store double %2, double* @hue
>
>   %3 = load double* @hue
>   %4 = frem double %3, 1.000000e+00
>   %5 = fptrunc double %4 to float
>   %6 = call %vec3* @vec3__PZ4vec3__fff(float %5, float 0x3FD3333340000000,
> float 0x3FEE666660000000) #1
>
>   ret i32 0
> }
>
> attributes #0 = { noinline nounwind }
> attributes #1 = { nounwind }
>
> The last few lines from the log are as follows:
>
> [2015-02-12 16:48:08.678188100] 0xb81c40   Executing Pass 'Interprocedural
> Sparse Conditional Constant Propagation' on Module 'bug.ll'...
> 0xb94e90     Required Analyses: Target Library Information
>  -*- 'Interprocedural Sparse Conditional Constant Propagation' is the last
> user of following pass instances. Free theseinstances
> [2015-02-12 16:48:08.683191600] 0xb81c40    Freeing Pass 'Interprocedural
> Sparse Conditional Constant Propagation' on Module 'bug.ll'...
> [2015-02-12 16:48:08.686193300] 0xb81c40   Executing Pass 'Global Variable
> Optimizer' on Module 'bug.ll'...
> 0xb845b0     Required Analyses: Target Library Information
>  -*- 'Global Variable Optimizer' is the last user of following pass
> instances. Free these instances
> [2015-02-12 16:48:08.688194100] 0xb81c40    Freeing Pass 'Global Variable
> Optimizer' on Module 'bug.ll'...
> [2015-02-12 16:48:08.690195800] 0xb81c40   Executing Pass 'Dead Argument
> Elimination' on Module 'bug.ll'...
>  -*- 'Dead Argument Elimination' is the last user of following pass
> instances. Free these instances
> [2015-02-12 16:48:08.694198400] 0xb81c40    Freeing Pass 'Dead Argument
> Elimination' on Module 'bug.ll'...
> [2015-02-12 16:48:08.696202400] 0xb81c40   Executing Pass 'Function Pass
> Manager' on Module 'bug.ll'...
> [2015-02-12 16:48:08.698201000] 0xba8638     Executing Pass 'Combine
> redundant instructions' on Function 'main__i__v'...
> 0xbb0fc8       Required Analyses: Target Library Information
>
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