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llvm-6502/test/CodeGen/X86/multiple-loop-post-inc.ll
Evan Cheng 623a7e146b Use a bigger hammer to fix PR11314 by disabling the "forcing two-address 
instruction lower optimization" in the pre-RA scheduler.

The optimization, rather the hack, was done before MI use-list was available.
Now we should be able to implement it in a better way, perhaps in the
two-address pass until a MI scheduler is available.

Now that the scheduler has to backtrack to handle call sequences. Adding
artificial scheduling constraints is just not safe. Furthermore, the hack
is not taking all the other scheduling decisions into consideration so it's just
as likely to pessimize code. So I view disabling this optimization goodness
regardless of PR11314.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144267 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-10 07:43:16 +00:00

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; RUN: llc -asm-verbose=false -disable-branch-fold -disable-code-place -disable-tail-duplicate -march=x86-64 < %s | FileCheck %s
; rdar://7236213
; Xfailed now that scheduler 2-address hack is disabled a lea is generated.
; The code isn't any worse though.
; XFAIL: *
; CodeGen shouldn't require any lea instructions inside the marked loop.
; It should properly set up post-increment uses and do coalescing for
; the induction variables.
; CHECK: # Start
; CHECK-NOT: lea
; CHECK: # Stop
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
define void @foo(float* %I, i64 %IS, float* nocapture %Start, float* nocapture %Step, float* %O, i64 %OS, i64 %N) nounwind {
entry:
%times4 = alloca float, align 4 ; <float*> [#uses=3]
%timesN = alloca float, align 4 ; <float*> [#uses=2]
%0 = load float* %Step, align 4 ; <float> [#uses=8]
%1 = ptrtoint float* %I to i64 ; <i64> [#uses=1]
%2 = ptrtoint float* %O to i64 ; <i64> [#uses=1]
%tmp = xor i64 %2, %1 ; <i64> [#uses=1]
%tmp16 = and i64 %tmp, 15 ; <i64> [#uses=1]
%3 = icmp eq i64 %tmp16, 0 ; <i1> [#uses=1]
%4 = trunc i64 %IS to i32 ; <i32> [#uses=1]
%5 = xor i32 %4, 1 ; <i32> [#uses=1]
%6 = trunc i64 %OS to i32 ; <i32> [#uses=1]
%7 = xor i32 %6, 1 ; <i32> [#uses=1]
%8 = or i32 %7, %5 ; <i32> [#uses=1]
%9 = icmp eq i32 %8, 0 ; <i1> [#uses=1]
br i1 %9, label %bb, label %return
bb: ; preds = %entry
%10 = load float* %Start, align 4 ; <float> [#uses=1]
br label %bb2
bb1: ; preds = %bb3
%11 = load float* %I_addr.0, align 4 ; <float> [#uses=1]
%12 = fmul float %11, %x.0 ; <float> [#uses=1]
store float %12, float* %O_addr.0, align 4
%13 = fadd float %x.0, %0 ; <float> [#uses=1]
%indvar.next53 = add i64 %14, 1 ; <i64> [#uses=1]
br label %bb2
bb2: ; preds = %bb1, %bb
%14 = phi i64 [ %indvar.next53, %bb1 ], [ 0, %bb ] ; <i64> [#uses=21]
%x.0 = phi float [ %13, %bb1 ], [ %10, %bb ] ; <float> [#uses=6]
%N_addr.0 = sub i64 %N, %14 ; <i64> [#uses=4]
%O_addr.0 = getelementptr float* %O, i64 %14 ; <float*> [#uses=4]
%I_addr.0 = getelementptr float* %I, i64 %14 ; <float*> [#uses=3]
%15 = icmp slt i64 %N_addr.0, 1 ; <i1> [#uses=1]
br i1 %15, label %bb4, label %bb3
bb3: ; preds = %bb2
%16 = ptrtoint float* %O_addr.0 to i64 ; <i64> [#uses=1]
%17 = and i64 %16, 15 ; <i64> [#uses=1]
%18 = icmp eq i64 %17, 0 ; <i1> [#uses=1]
br i1 %18, label %bb4, label %bb1
bb4: ; preds = %bb3, %bb2
%19 = fmul float %0, 4.000000e+00 ; <float> [#uses=1]
store float %19, float* %times4, align 4
%20 = fmul float %0, 1.600000e+01 ; <float> [#uses=1]
store float %20, float* %timesN, align 4
%21 = fmul float %0, 0.000000e+00 ; <float> [#uses=1]
%22 = fadd float %21, %x.0 ; <float> [#uses=1]
%23 = fadd float %x.0, %0 ; <float> [#uses=1]
%24 = fmul float %0, 2.000000e+00 ; <float> [#uses=1]
%25 = fadd float %24, %x.0 ; <float> [#uses=1]
%26 = fmul float %0, 3.000000e+00 ; <float> [#uses=1]
%27 = fadd float %26, %x.0 ; <float> [#uses=1]
%28 = insertelement <4 x float> undef, float %22, i32 0 ; <<4 x float>> [#uses=1]
%29 = insertelement <4 x float> %28, float %23, i32 1 ; <<4 x float>> [#uses=1]
%30 = insertelement <4 x float> %29, float %25, i32 2 ; <<4 x float>> [#uses=1]
%31 = insertelement <4 x float> %30, float %27, i32 3 ; <<4 x float>> [#uses=5]
%asmtmp.i = call <4 x float> asm "movss $1, $0\09\0Apshufd $$0, $0, $0", "=x,*m,~{dirflag},~{fpsr},~{flags}"(float* %times4) nounwind ; <<4 x float>> [#uses=3]
%32 = fadd <4 x float> %31, %asmtmp.i ; <<4 x float>> [#uses=3]
%33 = fadd <4 x float> %32, %asmtmp.i ; <<4 x float>> [#uses=3]
%34 = fadd <4 x float> %33, %asmtmp.i ; <<4 x float>> [#uses=2]
%asmtmp.i18 = call <4 x float> asm "movss $1, $0\09\0Apshufd $$0, $0, $0", "=x,*m,~{dirflag},~{fpsr},~{flags}"(float* %timesN) nounwind ; <<4 x float>> [#uses=8]
%35 = icmp sgt i64 %N_addr.0, 15 ; <i1> [#uses=2]
br i1 %3, label %bb6.preheader, label %bb8
bb6.preheader: ; preds = %bb4
br i1 %35, label %bb.nph43, label %bb7
bb.nph43: ; preds = %bb6.preheader
%tmp108 = add i64 %14, 16 ; <i64> [#uses=1]
%tmp111 = add i64 %14, 4 ; <i64> [#uses=1]
%tmp115 = add i64 %14, 8 ; <i64> [#uses=1]
%tmp119 = add i64 %14, 12 ; <i64> [#uses=1]
%tmp134 = add i64 %N, -16 ; <i64> [#uses=1]
%tmp135 = sub i64 %tmp134, %14 ; <i64> [#uses=1]
call void asm sideeffect "# Start.", "~{dirflag},~{fpsr},~{flags}"() nounwind
br label %bb5
bb5: ; preds = %bb.nph43, %bb5
%indvar102 = phi i64 [ 0, %bb.nph43 ], [ %indvar.next103, %bb5 ] ; <i64> [#uses=3]
%vX3.041 = phi <4 x float> [ %34, %bb.nph43 ], [ %45, %bb5 ] ; <<4 x float>> [#uses=2]
%vX0.039 = phi <4 x float> [ %31, %bb.nph43 ], [ %41, %bb5 ] ; <<4 x float>> [#uses=2]
%vX2.037 = phi <4 x float> [ %33, %bb.nph43 ], [ %46, %bb5 ] ; <<4 x float>> [#uses=2]
%vX1.036 = phi <4 x float> [ %32, %bb.nph43 ], [ %47, %bb5 ] ; <<4 x float>> [#uses=2]
%tmp104 = shl i64 %indvar102, 4 ; <i64> [#uses=5]
%tmp105 = add i64 %14, %tmp104 ; <i64> [#uses=2]
%scevgep106 = getelementptr float* %I, i64 %tmp105 ; <float*> [#uses=1]
%scevgep106107 = bitcast float* %scevgep106 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp109 = add i64 %tmp108, %tmp104 ; <i64> [#uses=2]
%tmp112 = add i64 %tmp111, %tmp104 ; <i64> [#uses=2]
%scevgep113 = getelementptr float* %I, i64 %tmp112 ; <float*> [#uses=1]
%scevgep113114 = bitcast float* %scevgep113 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp116 = add i64 %tmp115, %tmp104 ; <i64> [#uses=2]
%scevgep117 = getelementptr float* %I, i64 %tmp116 ; <float*> [#uses=1]
%scevgep117118 = bitcast float* %scevgep117 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp120 = add i64 %tmp119, %tmp104 ; <i64> [#uses=2]
%scevgep121 = getelementptr float* %I, i64 %tmp120 ; <float*> [#uses=1]
%scevgep121122 = bitcast float* %scevgep121 to <4 x float>* ; <<4 x float>*> [#uses=1]
%scevgep123 = getelementptr float* %O, i64 %tmp105 ; <float*> [#uses=1]
%scevgep123124 = bitcast float* %scevgep123 to <4 x float>* ; <<4 x float>*> [#uses=1]
%scevgep126 = getelementptr float* %O, i64 %tmp112 ; <float*> [#uses=1]
%scevgep126127 = bitcast float* %scevgep126 to <4 x float>* ; <<4 x float>*> [#uses=1]
%scevgep128 = getelementptr float* %O, i64 %tmp116 ; <float*> [#uses=1]
%scevgep128129 = bitcast float* %scevgep128 to <4 x float>* ; <<4 x float>*> [#uses=1]
%scevgep130 = getelementptr float* %O, i64 %tmp120 ; <float*> [#uses=1]
%scevgep130131 = bitcast float* %scevgep130 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp132 = mul i64 %indvar102, -16 ; <i64> [#uses=1]
%tmp136 = add i64 %tmp135, %tmp132 ; <i64> [#uses=2]
%36 = load <4 x float>* %scevgep106107, align 16 ; <<4 x float>> [#uses=1]
%37 = load <4 x float>* %scevgep113114, align 16 ; <<4 x float>> [#uses=1]
%38 = load <4 x float>* %scevgep117118, align 16 ; <<4 x float>> [#uses=1]
%39 = load <4 x float>* %scevgep121122, align 16 ; <<4 x float>> [#uses=1]
%40 = fmul <4 x float> %36, %vX0.039 ; <<4 x float>> [#uses=1]
%41 = fadd <4 x float> %vX0.039, %asmtmp.i18 ; <<4 x float>> [#uses=2]
%42 = fmul <4 x float> %37, %vX1.036 ; <<4 x float>> [#uses=1]
%43 = fmul <4 x float> %38, %vX2.037 ; <<4 x float>> [#uses=1]
%44 = fmul <4 x float> %39, %vX3.041 ; <<4 x float>> [#uses=1]
store <4 x float> %40, <4 x float>* %scevgep123124, align 16
store <4 x float> %42, <4 x float>* %scevgep126127, align 16
store <4 x float> %43, <4 x float>* %scevgep128129, align 16
store <4 x float> %44, <4 x float>* %scevgep130131, align 16
%45 = fadd <4 x float> %vX3.041, %asmtmp.i18 ; <<4 x float>> [#uses=1]
%46 = fadd <4 x float> %vX2.037, %asmtmp.i18 ; <<4 x float>> [#uses=1]
%47 = fadd <4 x float> %vX1.036, %asmtmp.i18 ; <<4 x float>> [#uses=1]
%48 = icmp sgt i64 %tmp136, 15 ; <i1> [#uses=1]
%indvar.next103 = add i64 %indvar102, 1 ; <i64> [#uses=1]
br i1 %48, label %bb5, label %bb6.bb7_crit_edge
bb6.bb7_crit_edge: ; preds = %bb5
call void asm sideeffect "# Stop.", "~{dirflag},~{fpsr},~{flags}"() nounwind
%scevgep110 = getelementptr float* %I, i64 %tmp109 ; <float*> [#uses=1]
%scevgep125 = getelementptr float* %O, i64 %tmp109 ; <float*> [#uses=1]
br label %bb7
bb7: ; preds = %bb6.bb7_crit_edge, %bb6.preheader
%I_addr.1.lcssa = phi float* [ %scevgep110, %bb6.bb7_crit_edge ], [ %I_addr.0, %bb6.preheader ] ; <float*> [#uses=1]
%O_addr.1.lcssa = phi float* [ %scevgep125, %bb6.bb7_crit_edge ], [ %O_addr.0, %bb6.preheader ] ; <float*> [#uses=1]
%vX0.0.lcssa = phi <4 x float> [ %41, %bb6.bb7_crit_edge ], [ %31, %bb6.preheader ] ; <<4 x float>> [#uses=1]
%N_addr.1.lcssa = phi i64 [ %tmp136, %bb6.bb7_crit_edge ], [ %N_addr.0, %bb6.preheader ] ; <i64> [#uses=1]
%asmtmp.i17 = call <4 x float> asm "movss $1, $0\09\0Apshufd $$0, $0, $0", "=x,*m,~{dirflag},~{fpsr},~{flags}"(float* %times4) nounwind ; <<4 x float>> [#uses=0]
br label %bb11
bb8: ; preds = %bb4
br i1 %35, label %bb.nph, label %bb11
bb.nph: ; preds = %bb8
%I_addr.0.sum = add i64 %14, -1 ; <i64> [#uses=1]
%49 = getelementptr inbounds float* %I, i64 %I_addr.0.sum ; <float*> [#uses=1]
%50 = bitcast float* %49 to <4 x float>* ; <<4 x float>*> [#uses=1]
%51 = load <4 x float>* %50, align 16 ; <<4 x float>> [#uses=1]
%tmp54 = add i64 %14, 16 ; <i64> [#uses=1]
%tmp56 = add i64 %14, 3 ; <i64> [#uses=1]
%tmp60 = add i64 %14, 7 ; <i64> [#uses=1]
%tmp64 = add i64 %14, 11 ; <i64> [#uses=1]
%tmp68 = add i64 %14, 15 ; <i64> [#uses=1]
%tmp76 = add i64 %14, 4 ; <i64> [#uses=1]
%tmp80 = add i64 %14, 8 ; <i64> [#uses=1]
%tmp84 = add i64 %14, 12 ; <i64> [#uses=1]
%tmp90 = add i64 %N, -16 ; <i64> [#uses=1]
%tmp91 = sub i64 %tmp90, %14 ; <i64> [#uses=1]
br label %bb9
bb9: ; preds = %bb.nph, %bb9
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %bb9 ] ; <i64> [#uses=3]
%vX3.125 = phi <4 x float> [ %34, %bb.nph ], [ %69, %bb9 ] ; <<4 x float>> [#uses=2]
%vX0.223 = phi <4 x float> [ %31, %bb.nph ], [ %65, %bb9 ] ; <<4 x float>> [#uses=2]
%vX2.121 = phi <4 x float> [ %33, %bb.nph ], [ %70, %bb9 ] ; <<4 x float>> [#uses=2]
%vX1.120 = phi <4 x float> [ %32, %bb.nph ], [ %71, %bb9 ] ; <<4 x float>> [#uses=2]
%vI0.019 = phi <4 x float> [ %51, %bb.nph ], [ %55, %bb9 ] ; <<4 x float>> [#uses=1]
%tmp51 = shl i64 %indvar, 4 ; <i64> [#uses=9]
%tmp55 = add i64 %tmp54, %tmp51 ; <i64> [#uses=2]
%tmp57 = add i64 %tmp56, %tmp51 ; <i64> [#uses=1]
%scevgep58 = getelementptr float* %I, i64 %tmp57 ; <float*> [#uses=1]
%scevgep5859 = bitcast float* %scevgep58 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp61 = add i64 %tmp60, %tmp51 ; <i64> [#uses=1]
%scevgep62 = getelementptr float* %I, i64 %tmp61 ; <float*> [#uses=1]
%scevgep6263 = bitcast float* %scevgep62 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp65 = add i64 %tmp64, %tmp51 ; <i64> [#uses=1]
%scevgep66 = getelementptr float* %I, i64 %tmp65 ; <float*> [#uses=1]
%scevgep6667 = bitcast float* %scevgep66 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp69 = add i64 %tmp68, %tmp51 ; <i64> [#uses=1]
%scevgep70 = getelementptr float* %I, i64 %tmp69 ; <float*> [#uses=1]
%scevgep7071 = bitcast float* %scevgep70 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp72 = add i64 %14, %tmp51 ; <i64> [#uses=1]
%scevgep73 = getelementptr float* %O, i64 %tmp72 ; <float*> [#uses=1]
%scevgep7374 = bitcast float* %scevgep73 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp77 = add i64 %tmp76, %tmp51 ; <i64> [#uses=1]
%scevgep78 = getelementptr float* %O, i64 %tmp77 ; <float*> [#uses=1]
%scevgep7879 = bitcast float* %scevgep78 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp81 = add i64 %tmp80, %tmp51 ; <i64> [#uses=1]
%scevgep82 = getelementptr float* %O, i64 %tmp81 ; <float*> [#uses=1]
%scevgep8283 = bitcast float* %scevgep82 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp85 = add i64 %tmp84, %tmp51 ; <i64> [#uses=1]
%scevgep86 = getelementptr float* %O, i64 %tmp85 ; <float*> [#uses=1]
%scevgep8687 = bitcast float* %scevgep86 to <4 x float>* ; <<4 x float>*> [#uses=1]
%tmp88 = mul i64 %indvar, -16 ; <i64> [#uses=1]
%tmp92 = add i64 %tmp91, %tmp88 ; <i64> [#uses=2]
%52 = load <4 x float>* %scevgep5859, align 16 ; <<4 x float>> [#uses=2]
%53 = load <4 x float>* %scevgep6263, align 16 ; <<4 x float>> [#uses=2]
%54 = load <4 x float>* %scevgep6667, align 16 ; <<4 x float>> [#uses=2]
%55 = load <4 x float>* %scevgep7071, align 16 ; <<4 x float>> [#uses=2]
%56 = shufflevector <4 x float> %vI0.019, <4 x float> %52, <4 x i32> <i32 4, i32 1, i32 2, i32 3> ; <<4 x float>> [#uses=1]
%57 = shufflevector <4 x float> %56, <4 x float> undef, <4 x i32> <i32 1, i32 2, i32 3, i32 0> ; <<4 x float>> [#uses=1]
%58 = shufflevector <4 x float> %52, <4 x float> %53, <4 x i32> <i32 4, i32 1, i32 2, i32 3> ; <<4 x float>> [#uses=1]
%59 = shufflevector <4 x float> %58, <4 x float> undef, <4 x i32> <i32 1, i32 2, i32 3, i32 0> ; <<4 x float>> [#uses=1]
%60 = shufflevector <4 x float> %53, <4 x float> %54, <4 x i32> <i32 4, i32 1, i32 2, i32 3> ; <<4 x float>> [#uses=1]
%61 = shufflevector <4 x float> %60, <4 x float> undef, <4 x i32> <i32 1, i32 2, i32 3, i32 0> ; <<4 x float>> [#uses=1]
%62 = shufflevector <4 x float> %54, <4 x float> %55, <4 x i32> <i32 4, i32 1, i32 2, i32 3> ; <<4 x float>> [#uses=1]
%63 = shufflevector <4 x float> %62, <4 x float> undef, <4 x i32> <i32 1, i32 2, i32 3, i32 0> ; <<4 x float>> [#uses=1]
%64 = fmul <4 x float> %57, %vX0.223 ; <<4 x float>> [#uses=1]
%65 = fadd <4 x float> %vX0.223, %asmtmp.i18 ; <<4 x float>> [#uses=2]
%66 = fmul <4 x float> %59, %vX1.120 ; <<4 x float>> [#uses=1]
%67 = fmul <4 x float> %61, %vX2.121 ; <<4 x float>> [#uses=1]
%68 = fmul <4 x float> %63, %vX3.125 ; <<4 x float>> [#uses=1]
store <4 x float> %64, <4 x float>* %scevgep7374, align 16
store <4 x float> %66, <4 x float>* %scevgep7879, align 16
store <4 x float> %67, <4 x float>* %scevgep8283, align 16
store <4 x float> %68, <4 x float>* %scevgep8687, align 16
%69 = fadd <4 x float> %vX3.125, %asmtmp.i18 ; <<4 x float>> [#uses=1]
%70 = fadd <4 x float> %vX2.121, %asmtmp.i18 ; <<4 x float>> [#uses=1]
%71 = fadd <4 x float> %vX1.120, %asmtmp.i18 ; <<4 x float>> [#uses=1]
%72 = icmp sgt i64 %tmp92, 15 ; <i1> [#uses=1]
%indvar.next = add i64 %indvar, 1 ; <i64> [#uses=1]
br i1 %72, label %bb9, label %bb10.bb11.loopexit_crit_edge
bb10.bb11.loopexit_crit_edge: ; preds = %bb9
%scevgep = getelementptr float* %I, i64 %tmp55 ; <float*> [#uses=1]
%scevgep75 = getelementptr float* %O, i64 %tmp55 ; <float*> [#uses=1]
br label %bb11
bb11: ; preds = %bb8, %bb10.bb11.loopexit_crit_edge, %bb7
%N_addr.2 = phi i64 [ %N_addr.1.lcssa, %bb7 ], [ %tmp92, %bb10.bb11.loopexit_crit_edge ], [ %N_addr.0, %bb8 ] ; <i64> [#uses=2]
%vX0.1 = phi <4 x float> [ %vX0.0.lcssa, %bb7 ], [ %65, %bb10.bb11.loopexit_crit_edge ], [ %31, %bb8 ] ; <<4 x float>> [#uses=1]
%O_addr.2 = phi float* [ %O_addr.1.lcssa, %bb7 ], [ %scevgep75, %bb10.bb11.loopexit_crit_edge ], [ %O_addr.0, %bb8 ] ; <float*> [#uses=1]
%I_addr.2 = phi float* [ %I_addr.1.lcssa, %bb7 ], [ %scevgep, %bb10.bb11.loopexit_crit_edge ], [ %I_addr.0, %bb8 ] ; <float*> [#uses=1]
%73 = extractelement <4 x float> %vX0.1, i32 0 ; <float> [#uses=2]
%74 = icmp sgt i64 %N_addr.2, 0 ; <i1> [#uses=1]
br i1 %74, label %bb12, label %bb14
bb12: ; preds = %bb11, %bb12
%indvar94 = phi i64 [ %indvar.next95, %bb12 ], [ 0, %bb11 ] ; <i64> [#uses=3]
%x.130 = phi float [ %77, %bb12 ], [ %73, %bb11 ] ; <float> [#uses=2]
%I_addr.433 = getelementptr float* %I_addr.2, i64 %indvar94 ; <float*> [#uses=1]
%O_addr.432 = getelementptr float* %O_addr.2, i64 %indvar94 ; <float*> [#uses=1]
%75 = load float* %I_addr.433, align 4 ; <float> [#uses=1]
%76 = fmul float %75, %x.130 ; <float> [#uses=1]
store float %76, float* %O_addr.432, align 4
%77 = fadd float %x.130, %0 ; <float> [#uses=2]
%indvar.next95 = add i64 %indvar94, 1 ; <i64> [#uses=2]
%exitcond = icmp eq i64 %indvar.next95, %N_addr.2 ; <i1> [#uses=1]
br i1 %exitcond, label %bb14, label %bb12
bb14: ; preds = %bb12, %bb11
%x.1.lcssa = phi float [ %73, %bb11 ], [ %77, %bb12 ] ; <float> [#uses=1]
store float %x.1.lcssa, float* %Start, align 4
ret void
return: ; preds = %entry
ret void
}
; Codegen shouldn't crash on this testcase.
define void @bar(i32 %a, i32 %b) nounwind {
entry: ; preds = %bb1, %entry, %for.end204
br label %outer
outer: ; preds = %bb1, %entry
%i6 = phi i32 [ %storemerge171, %bb1 ], [ %a, %entry ] ; <i32> [#uses=2]
%storemerge171 = add i32 %i6, 1 ; <i32> [#uses=1]
br label %inner
inner: ; preds = %bb0, %if.end275
%i8 = phi i32 [ %a, %outer ], [ %indvar.next159, %bb0 ] ; <i32> [#uses=2]
%t338 = load i32* undef ; <i32> [#uses=1]
%t191 = mul i32 %i8, %t338 ; <i32> [#uses=1]
%t179 = add i32 %i6, %t191 ; <i32> [#uses=1]
br label %bb0
bb0: ; preds = %for.body332
%indvar.next159 = add i32 %i8, 1 ; <i32> [#uses=1]
br i1 undef, label %bb1, label %inner
bb1: ; preds = %bb0, %outer
%midx.4 = phi i32 [ %t179, %bb0 ] ; <i32> [#uses=0]
br label %outer
}
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