[llvm] r214494 - SLPVectorizer: improved scheduling algorithm.

[Joerg Sonnenberger]

On Fri, Aug 01, 2014 at 09:20:43AM -0000, Erik Eckstein wrote:
> Author: eeckstein
> Date: Fri Aug  1 04:20:42 2014
> New Revision: 214494
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=214494&view=rev
> Log:
> SLPVectorizer: improved scheduling algorithm.

This crashes on the attached input. Can you fix or revert please?

Joerg
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; ModuleID = 'auth_poly1305_53-33b314.bc'
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--netbsd"

@b = common global double 0.000000e+00, align 8
@c = common global i32 0, align 4
@e = common global double 0.000000e+00, align 8
@a = common global double 0.000000e+00, align 8
@d = common global double 0.000000e+00, align 8
@g = common global double 0.000000e+00, align 8
@f = common global double 0.000000e+00, align 8
@h = common global double 0.000000e+00, align 8
@i = common global double 0.000000e+00, align 8

; Function Attrs: nounwind uwtable
define i32 @fn1() #0 {
entry:
  %j = alloca double, align 8
  br label %multiplyaddatleast16bytes

multiplyaddatleast16bytes:                        ; preds = %if.end, %entry
  %0 = load double* @b, align 8
  %1 = load i32* @c, align 4
  %conv = sitofp i32 %1 to double
  %sub = fsub double %0, %conv
  store double %sub, double* @e, align 8
  %2 = load double* @a, align 8
  %3 = load double* @d, align 8
  %sub1 = fsub double %2, %3
  store double %sub1, double* @g, align 8
  %4 = load double* @e, align 8
  %5 = load double* @f, align 8
  %add = fadd double %5, %4
  store double %add, double* @f, align 8
  %6 = load double* @g, align 8
  %7 = load double* %j, align 8
  %add2 = fadd double %7, %6
  store double %add2, double* %j, align 8
  %8 = load double* @f, align 8
  %mul = fmul double 0.000000e+00, %8
  store double %mul, double* @h, align 8
  %9 = load double* @b, align 8
  %add3 = fadd double %9, 0.000000e+00
  store double %add3, double* @b, align 8
  %10 = load double* @h, align 8
  %11 = load double* @a, align 8
  %add4 = fadd double %11, %10
  store double %add4, double* @a, align 8
  %12 = load double* %j, align 8
  %mul5 = fmul double 0.000000e+00, %12
  store double %mul5, double* @i, align 8
  %13 = load double* @i, align 8
  %14 = load double* @a, align 8
  %add6 = fadd double %14, %13
  store double %add6, double* @a, align 8
  %15 = load double* @b, align 8
  %inc = fadd double %15, 1.000000e+00
  store double %inc, double* @b, align 8
  %16 = load double* @a, align 8
  %add7 = fadd double %16, 0.000000e+00
  store double %add7, double* @a, align 8
  %17 = load double* @a, align 8
  %tobool = fcmp une double %17, 0.000000e+00
  br i1 %tobool, label %if.then, label %if.end

if.then:                                          ; preds = %multiplyaddatleast16bytes
  ret i32 1

if.end:                                           ; preds = %multiplyaddatleast16bytes
  br label %multiplyaddatleast16bytes
}

attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.ident = !{!0}

!0 = metadata !{metadata !"clang version 3.6.0 (216456)"}