#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ btrfly(int, double, double, double, double, double, double,
                          double *, double *, double *, double *);
void cftmd21(int n, int l, double *a, double *w) {
  int j, k, k1;
  int m = l << 2;
  int m2 = 2 * m;
  int m3 = 3 * m;
  double *v = w + 1;
  double *b = a + l;
  double *c = a + l + l;
  double *d = a + l + l + l;
  for (k = m2, k1 = 2; k < n; k += m2, k1 += 2) {
    double wk2r = w[k1];
    double wk2i = v[k1];
    double wk1r = w[k1 + k1];
    double wk1i = v[k1 + k1];
    double wk3r = wk1r - 2 * wk2i * wk1i;
    double wk3i = 2 * wk2i * wk1r - wk1i;
#pragma mta use 100 streams
#pragma mta assert no dependence
    for (j = k; j < k + l; j += 2)
      btrfly(j, wk1r, wk1i, wk2r, wk2i, wk3r, wk3i, a, b, c, d);
    wk1r = w[k1 + k1 + 2];
    wk1i = v[k1 + k1 + 2];
    wk3r = wk1r - 2 * wk2r * wk1i;
    wk3i = 2 * wk2r * wk1r - wk1i;
#pragma mta use 100 streams
#pragma mta assert no dependence
    for (j = k + m; j < k + m + l; j += 2)
      btrfly(j, wk1r, wk1i, -wk2i, wk2r, wk3r, wk3i, a, b, c, d);
  }
}


x86 assembly (clang, -O0):
<cftmd21>:
push   %rbp
mov    %rsp,%rbp
sub    $0x80,%rsp
mov    %edi,-0x4(%rbp)
mov    %esi,-0x8(%rbp)
mov    %rdx,-0x10(%rbp)
mov    %rcx,-0x18(%rbp)
mov    -0x8(%rbp),%eax
shl    $0x2,%eax
mov    %eax,-0x28(%rbp)
mov    -0x28(%rbp),%eax
shl    $0x1,%eax
mov    %eax,-0x2c(%rbp)
imul   $0x3,-0x28(%rbp),%eax
mov    %eax,-0x30(%rbp)
mov    -0x18(%rbp),%rax
add    $0x8,%rax
mov    %rax,-0x38(%rbp)
mov    -0x10(%rbp),%rax
movslq -0x8(%rbp),%rcx
shl    $0x3,%rcx
add    %rcx,%rax
mov    %rax,-0x40(%rbp)
mov    -0x10(%rbp),%rax
movslq -0x8(%rbp),%rcx
shl    $0x3,%rcx
add    %rcx,%rax
movslq -0x8(%rbp),%rcx
shl    $0x3,%rcx
add    %rcx,%rax
mov    %rax,-0x48(%rbp)
mov    -0x10(%rbp),%rax
movslq -0x8(%rbp),%rcx
shl    $0x3,%rcx
add    %rcx,%rax
movslq -0x8(%rbp),%rcx
shl    $0x3,%rcx
add    %rcx,%rax
movslq -0x8(%rbp),%rcx
shl    $0x3,%rcx
add    %rcx,%rax
mov    %rax,-0x50(%rbp)
mov    -0x2c(%rbp),%eax
mov    %eax,-0x20(%rbp)
movl   $0x2,-0x24(%rbp)
mov    -0x20(%rbp),%eax
cmp    -0x4(%rbp),%eax
jge    1422 <cftmd21+0x312>
mov    -0x18(%rbp),%rax
movslq -0x24(%rbp),%rcx
movsd  (%rax,%rcx,8),%xmm0
movsd  %xmm0,-0x58(%rbp)
mov    -0x38(%rbp),%rax
movslq -0x24(%rbp),%rcx
movsd  (%rax,%rcx,8),%xmm0
movsd  %xmm0,-0x60(%rbp)
mov    -0x18(%rbp),%rax
mov    -0x24(%rbp),%ecx
add    -0x24(%rbp),%ecx
movslq %ecx,%rcx
movsd  (%rax,%rcx,8),%xmm0
movsd  %xmm0,-0x68(%rbp)
mov    -0x38(%rbp),%rax
mov    -0x24(%rbp),%ecx
add    -0x24(%rbp),%ecx
movslq %ecx,%rcx
movsd  (%rax,%rcx,8),%xmm0
movsd  %xmm0,-0x70(%rbp)
movsd  -0x68(%rbp),%xmm1
movsd  0xde0(%rip),%xmm0
mulsd  -0x60(%rbp),%xmm0
movsd  -0x70(%rbp),%xmm2
movq   %xmm0,%rax
movabs $0x8000000000000000,%rcx
xor    %rcx,%rax
movq   %rax,%xmm0
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x78(%rbp)
movsd  0xdaa(%rip),%xmm0
mulsd  -0x60(%rbp),%xmm0
movsd  -0x68(%rbp),%xmm2
movsd  -0x70(%rbp),%xmm1
movq   %xmm1,%rax
movabs $0x8000000000000000,%rcx
xor    %rcx,%rax
movq   %rax,%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x80(%rbp)
mov    -0x20(%rbp),%eax
mov    %eax,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
mov    -0x20(%rbp),%ecx
add    -0x8(%rbp),%ecx
cmp    %ecx,%eax
jge    12e4 <cftmd21+0x1d4>
mov    -0x1c(%rbp),%edi
movsd  -0x68(%rbp),%xmm0
movsd  -0x70(%rbp),%xmm1
movsd  -0x58(%rbp),%xmm2
movsd  -0x60(%rbp),%xmm3
movsd  -0x78(%rbp),%xmm4
movsd  -0x80(%rbp),%xmm5
mov    -0x10(%rbp),%rsi
mov    -0x40(%rbp),%rdx
mov    -0x48(%rbp),%rcx
mov    -0x50(%rbp),%r8
call   1030 <btrfly@plt>
mov    -0x1c(%rbp),%eax
add    $0x2,%eax
mov    %eax,-0x1c(%rbp)
jmp    128f <cftmd21+0x17f>
mov    -0x18(%rbp),%rax
mov    -0x24(%rbp),%ecx
add    -0x24(%rbp),%ecx
add    $0x2,%ecx
movslq %ecx,%rcx
movsd  (%rax,%rcx,8),%xmm0
movsd  %xmm0,-0x68(%rbp)
mov    -0x38(%rbp),%rax
mov    -0x24(%rbp),%ecx
add    -0x24(%rbp),%ecx
add    $0x2,%ecx
movslq %ecx,%rcx
movsd  (%rax,%rcx,8),%xmm0
movsd  %xmm0,-0x70(%rbp)
movsd  -0x68(%rbp),%xmm1
movsd  0xcdb(%rip),%xmm0
mulsd  -0x58(%rbp),%xmm0
movsd  -0x70(%rbp),%xmm2
movq   %xmm0,%rax
movabs $0x8000000000000000,%rcx
xor    %rcx,%rax
movq   %rax,%xmm0
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x78(%rbp)
movsd  0xca5(%rip),%xmm0
mulsd  -0x58(%rbp),%xmm0
movsd  -0x68(%rbp),%xmm2
movsd  -0x70(%rbp),%xmm1
movq   %xmm1,%rax
movabs $0x8000000000000000,%rcx
xor    %rcx,%rax
movq   %rax,%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x80(%rbp)
mov    -0x20(%rbp),%eax
add    -0x28(%rbp),%eax
mov    %eax,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
mov    -0x20(%rbp),%ecx
add    -0x28(%rbp),%ecx
add    -0x8(%rbp),%ecx
cmp    %ecx,%eax
jge    1406 <cftmd21+0x2f6>
mov    -0x1c(%rbp),%edi
movsd  -0x68(%rbp),%xmm0
movsd  -0x70(%rbp),%xmm1
movsd  -0x60(%rbp),%xmm2
movq   %xmm2,%rax
movabs $0x8000000000000000,%rcx
xor    %rcx,%rax
movq   %rax,%xmm2
movsd  -0x58(%rbp),%xmm3
movsd  -0x78(%rbp),%xmm4
movsd  -0x80(%rbp),%xmm5
mov    -0x10(%rbp),%rsi
mov    -0x40(%rbp),%rdx
mov    -0x48(%rbp),%rcx
mov    -0x50(%rbp),%r8
call   1030 <btrfly@plt>
mov    -0x1c(%rbp),%eax
add    $0x2,%eax
mov    %eax,-0x1c(%rbp)
jmp    1397 <cftmd21+0x287>
jmp    140b <cftmd21+0x2fb>
mov    -0x2c(%rbp),%eax
add    -0x20(%rbp),%eax
mov    %eax,-0x20(%rbp)
mov    -0x24(%rbp),%eax
add    $0x2,%eax
mov    %eax,-0x24(%rbp)
jmp    11b5 <cftmd21+0xa5>
add    $0x80,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<cftmd21>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x78,%rsp
mov    %rcx,0x18(%rsp)
mov    %rsi,(%rsp)
lea    0x0(,%rsi,8),%eax
mov    %edi,0x44(%rsp)
mov    %eax,0xc(%rsp)
cmp    %edi,%eax
jge    133a <cftmd21+0x22a>
mov    %rdx,%rbx
mov    (%rsp),%rax
lea    0x0(,%rax,4),%ecx
mov    %rcx,0x70(%rsp)
cltq
lea    (%rdx,%rax,8),%r14
lea    (%r14,%rax,8),%r13
lea    0x0(%r13,%rax,8),%r12
mov    $0x2,%ecx
mov    0xc(%rsp),%eax
mov    %rax,0x10(%rsp)
jmp    1191 <cftmd21+0x81>
mov    0x10(%rsp),%rax
add    0xc(%rsp),%eax
mov    0x20(%rsp),%rcx
add    $0x2,%rcx
mov    %rax,0x10(%rsp)
cmp    0x44(%rsp),%eax
jge    133a <cftmd21+0x22a>
mov    0x18(%rsp),%rax
movsd  (%rax,%rcx,8),%xmm2
mov    %rcx,0x20(%rsp)
movsd  0x8(%rax,%rcx,8),%xmm3
cmpl   $0x0,(%rsp)
mov    %rbx,%r15
movsd  %xmm2,0x48(%rsp)
jle    1262 <cftmd21+0x152>
mov    0x20(%rsp),%rax
shl    $0x4,%rax
mov    (%rsp),%rcx
mov    0x10(%rsp),%rdx
lea    (%rdx,%rcx,1),%ebx
mov    0x18(%rsp),%rcx
movsd  (%rcx,%rax,1),%xmm1
movsd  0x8(%rcx,%rax,1),%xmm4
movapd %xmm3,%xmm5
addsd  %xmm3,%xmm5
movapd %xmm5,%xmm0
mulsd  %xmm4,%xmm0
movapd %xmm1,%xmm6
subsd  %xmm0,%xmm6
movsd  %xmm6,0x28(%rsp)
movsd  %xmm1,0x38(%rsp)
mulsd  %xmm1,%xmm5
movsd  %xmm4,0x30(%rsp)
subsd  %xmm4,%xmm5
movapd %xmm5,0x60(%rsp)
mov    %edx,%ebp
movapd %xmm3,0x50(%rsp)
xchg   %ax,%ax
mov    %ebp,%edi
movsd  0x38(%rsp),%xmm0
movsd  0x30(%rsp),%xmm1
movaps 0x50(%rsp),%xmm3
movsd  0x28(%rsp),%xmm4
movaps 0x60(%rsp),%xmm5
mov    %r15,%rsi
mov    %r14,%rdx
mov    %r13,%rcx
mov    %r12,%r8
call   1030 <btrfly@plt>
movapd 0x50(%rsp),%xmm3
movsd  0x48(%rsp),%xmm2
add    $0x2,%ebp
cmp    %ebx,%ebp
jl     1220 <cftmd21+0x110>
cmpl   $0x0,(%rsp)
mov    %r15,%rbx
jle    1170 <cftmd21+0x60>
mov    0x20(%rsp),%rax
add    %rax,%rax
shl    $0x3,%rax
or     $0x10,%rax
mov    0x70(%rsp),%rcx
mov    0x10(%rsp),%rdx
lea    (%rdx,%rcx,1),%r15d
mov    (%rsp),%rcx
lea    (%r15,%rcx,1),%ebp
mov    0x18(%rsp),%rcx
movsd  (%rcx,%rax,1),%xmm1
movsd  0x8(%rcx,%rax,1),%xmm4
addsd  %xmm2,%xmm2
movapd %xmm2,%xmm0
mulsd  %xmm4,%xmm0
movapd %xmm1,%xmm5
subsd  %xmm0,%xmm5
movsd  %xmm5,0x28(%rsp)
movsd  %xmm1,0x38(%rsp)
mulsd  %xmm1,%xmm2
movsd  %xmm4,0x30(%rsp)
subsd  %xmm4,%xmm2
movsd  %xmm2,0x60(%rsp)
xorpd  0xd1f(%rip),%xmm3
movapd %xmm3,0x50(%rsp)
nopw   0x0(%rax,%rax,1)
mov    %r15d,%edi
movsd  0x38(%rsp),%xmm0
movsd  0x30(%rsp),%xmm1
movapd %xmm3,%xmm2
movsd  0x48(%rsp),%xmm3
movsd  0x28(%rsp),%xmm4
movsd  0x60(%rsp),%xmm5
mov    %rbx,%rsi
mov    %r14,%rdx
mov    %r13,%rcx
mov    %r12,%r8
call   1030 <btrfly@plt>
movapd 0x50(%rsp),%xmm3
add    $0x2,%r15d
cmp    %ebp,%r15d
jl     12f0 <cftmd21+0x1e0>
jmp    1170 <cftmd21+0x60>
add    $0x78,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define void @cftmd21(i32 %0, i32 %1, double* %2, double* %3) {
%5 = alloca i32
%6 = alloca i32
%7 = alloca double*
%8 = alloca double*
%9 = alloca i32
%10 = alloca i32
%11 = alloca i32
%12 = alloca i32
%13 = alloca i32
%14 = alloca i32
%15 = alloca double*
%16 = alloca double*
%17 = alloca double*
%18 = alloca double*
%19 = alloca double
%20 = alloca double
%21 = alloca double
%22 = alloca double
%23 = alloca double
%24 = alloca double
store i32 %0, i32* %5
store i32 %1, i32* %6
store double* %2, double** %7
store double* %3, double** %8
%25 = load i32, i32* %6
%26 = shl i32 %25, 2
store i32 %26, i32* %12
%27 = load i32, i32* %12
%28 = mul nsw i32 2, %27
store i32 %28, i32* %13
%29 = load i32, i32* %12
%30 = mul nsw i32 3, %29
store i32 %30, i32* %14
%31 = load double*, double** %8
%32 = getelementptr inbounds double, double* %31, i64 1
store double* %32, double** %15
%33 = load double*, double** %7
%34 = load i32, i32* %6
%35 = sext i32 %34 to i64
%36 = getelementptr inbounds double, double* %33, i64 %35
store double* %36, double** %16
%37 = load double*, double** %7
%38 = load i32, i32* %6
%39 = sext i32 %38 to i64
%40 = getelementptr inbounds double, double* %37, i64 %39
%41 = load i32, i32* %6
%42 = sext i32 %41 to i64
%43 = getelementptr inbounds double, double* %40, i64 %42
store double* %43, double** %17
%44 = load double*, double** %7
%45 = load i32, i32* %6
%46 = sext i32 %45 to i64
%47 = getelementptr inbounds double, double* %44, i64 %46
%48 = load i32, i32* %6
%49 = sext i32 %48 to i64
%50 = getelementptr inbounds double, double* %47, i64 %49
%51 = load i32, i32* %6
%52 = sext i32 %51 to i64
%53 = getelementptr inbounds double, double* %50, i64 %52
store double* %53, double** %18
%54 = load i32, i32* %13
store i32 %54, i32* %10
store i32 2, i32* %11
br label %55
55: ; preds = %177, %4
%56 = load i32, i32* %10
%57 = load i32, i32* %5
%58 = icmp slt i32 %56, %57
br i1 %58, label %59, label %183
59: ; preds = %55
%60 = load double*, double** %8
%61 = load i32, i32* %11
%62 = sext i32 %61 to i64
%63 = getelementptr inbounds double, double* %60, i64 %62
%64 = load double, double* %63
store double %64, double* %19
%65 = load double*, double** %15
%66 = load i32, i32* %11
%67 = sext i32 %66 to i64
%68 = getelementptr inbounds double, double* %65, i64 %67
%69 = load double, double* %68
store double %69, double* %20
%70 = load double*, double** %8
%71 = load i32, i32* %11
%72 = load i32, i32* %11
%73 = add nsw i32 %71, %72
%74 = sext i32 %73 to i64
%75 = getelementptr inbounds double, double* %70, i64 %74
%76 = load double, double* %75
store double %76, double* %21
%77 = load double*, double** %15
%78 = load i32, i32* %11
%79 = load i32, i32* %11
%80 = add nsw i32 %78, %79
%81 = sext i32 %80 to i64
%82 = getelementptr inbounds double, double* %77, i64 %81
%83 = load double, double* %82
store double %83, double* %22
%84 = load double, double* %21
%85 = load double, double* %20
%86 = fmul double 2.000000e+00, %85
%87 = load double, double* %22
%88 = fneg double %86
%89 = call double @llvm.fmuladd.f64(double %88, double %87, double %84)
store double %89, double* %23
%90 = load double, double* %20
%91 = fmul double 2.000000e+00, %90
%92 = load double, double* %21
%93 = load double, double* %22
%94 = fneg double %93
%95 = call double @llvm.fmuladd.f64(double %91, double %92, double %94)
store double %95, double* %24
%96 = load i32, i32* %10
store i32 %96, i32* %9
br label %97
97: ; preds = %116, %59
%98 = load i32, i32* %9
%99 = load i32, i32* %10
%100 = load i32, i32* %6
%101 = add nsw i32 %99, %100
%102 = icmp slt i32 %98, %101
br i1 %102, label %103, label %119
103: ; preds = %97
%104 = load i32, i32* %9
%105 = load double, double* %21
%106 = load double, double* %22
%107 = load double, double* %19
%108 = load double, double* %20
%109 = load double, double* %23
%110 = load double, double* %24
%111 = load double*, double** %7
%112 = load double*, double** %16
%113 = load double*, double** %17
%114 = load double*, double** %18
%115 = call i32 @btrfly(i32 %104, double %105, double %106, double %107, double %108, double %109, double %110, double* %111, double* %112, double* %113, double* %114)
br label %116
116: ; preds = %103
%117 = load i32, i32* %9
%118 = add nsw i32 %117, 2
store i32 %118, i32* %9
br label %97
119: ; preds = %97
%120 = load double*, double** %8
%121 = load i32, i32* %11
%122 = load i32, i32* %11
%123 = add nsw i32 %121, %122
%124 = add nsw i32 %123, 2
%125 = sext i32 %124 to i64
%126 = getelementptr inbounds double, double* %120, i64 %125
%127 = load double, double* %126
store double %127, double* %21
%128 = load double*, double** %15
%129 = load i32, i32* %11
%130 = load i32, i32* %11
%131 = add nsw i32 %129, %130
%132 = add nsw i32 %131, 2
%133 = sext i32 %132 to i64
%134 = getelementptr inbounds double, double* %128, i64 %133
%135 = load double, double* %134
store double %135, double* %22
%136 = load double, double* %21
%137 = load double, double* %19
%138 = fmul double 2.000000e+00, %137
%139 = load double, double* %22
%140 = fneg double %138
%141 = call double @llvm.fmuladd.f64(double %140, double %139, double %136)
store double %141, double* %23
%142 = load double, double* %19
%143 = fmul double 2.000000e+00, %142
%144 = load double, double* %21
%145 = load double, double* %22
%146 = fneg double %145
%147 = call double @llvm.fmuladd.f64(double %143, double %144, double %146)
store double %147, double* %24
%148 = load i32, i32* %10
%149 = load i32, i32* %12
%150 = add nsw i32 %148, %149
store i32 %150, i32* %9
br label %151
151: ; preds = %173, %119
%152 = load i32, i32* %9
%153 = load i32, i32* %10
%154 = load i32, i32* %12
%155 = add nsw i32 %153, %154
%156 = load i32, i32* %6
%157 = add nsw i32 %155, %156
%158 = icmp slt i32 %152, %157
br i1 %158, label %159, label %176
159: ; preds = %151
%160 = load i32, i32* %9
%161 = load double, double* %21
%162 = load double, double* %22
%163 = load double, double* %20
%164 = fneg double %163
%165 = load double, double* %19
%166 = load double, double* %23
%167 = load double, double* %24
%168 = load double*, double** %7
%169 = load double*, double** %16
%170 = load double*, double** %17
%171 = load double*, double** %18
%172 = call i32 @btrfly(i32 %160, double %161, double %162, double %164, double %165, double %166, double %167, double* %168, double* %169, double* %170, double* %171)
br label %173
173: ; preds = %159
%174 = load i32, i32* %9
%175 = add nsw i32 %174, 2
store i32 %175, i32* %9
br label %151
176: ; preds = %151
br label %177
177: ; preds = %176
%178 = load i32, i32* %13
%179 = load i32, i32* %10
%180 = add nsw i32 %179, %178
store i32 %180, i32* %10
%181 = load i32, i32* %11
%182 = add nsw i32 %181, 2
store i32 %182, i32* %11
br label %55
183: ; preds = %55
ret void
}

LLVM IR (-O2):
define void @cftmd21(i32 %0, i32 %1, double* %2, double* nocapture %3) {
%5 = shl i32 %1, 2
%6 = shl i32 %1, 3
%7 = getelementptr inbounds double, double* %3, i64 1
%8 = sext i32 %1 to i64
%9 = getelementptr inbounds double, double* %2, i64 %8
%10 = getelementptr inbounds double, double* %9, i64 %8
%11 = getelementptr inbounds double, double* %10, i64 %8
%12 = icmp slt i32 %6, %0
br i1 %12, label %13, label %62
13: ; preds = %4
%14 = icmp sgt i32 %1, 0
br label %15
15: ; preds = %13, %58
%16 = phi i64 [ 2, %13 ], [ %60, %58 ]
%17 = phi i32 [ %6, %13 ], [ %59, %58 ]
%18 = getelementptr inbounds double, double* %3, i64 %16
%19 = load double, double* %18
%20 = getelementptr inbounds double, double* %7, i64 %16
%21 = load double, double* %20
%22 = shl nuw nsw i64 %16, 1
%23 = getelementptr inbounds double, double* %3, i64 %22
%24 = load double, double* %23
%25 = getelementptr inbounds double, double* %7, i64 %22
%26 = load double, double* %25
%27 = fmul double %21, 2.000000e+00
%28 = fneg double %27
%29 = tail call double @llvm.fmuladd.f64(double %28, double %26, double %24)
%30 = fneg double %26
%31 = tail call double @llvm.fmuladd.f64(double %27, double %24, double %30)
%32 = add nsw i32 %17, %1
br i1 %14, label %33, label %38
33: ; preds = %15, %33
%34 = phi i32 [ %36, %33 ], [ %17, %15 ]
%35 = tail call i32 @btrfly(i32 %34, double %24, double %26, double %19, double %21, double %29, double %31, double* %2, double* %9, double* %10, double* %11)
%36 = add nsw i32 %34, 2
%37 = icmp slt i32 %36, %32
br i1 %37, label %33, label %38
38: ; preds = %33, %15
%39 = or i64 %22, 2
%40 = getelementptr inbounds double, double* %3, i64 %39
%41 = load double, double* %40
%42 = getelementptr inbounds double, double* %7, i64 %39
%43 = load double, double* %42
%44 = fmul double %19, 2.000000e+00
%45 = fneg double %44
%46 = tail call double @llvm.fmuladd.f64(double %45, double %43, double %41)
%47 = fneg double %43
%48 = tail call double @llvm.fmuladd.f64(double %44, double %41, double %47)
%49 = add nsw i32 %17, %5
%50 = add nsw i32 %49, %1
br i1 %14, label %51, label %58
51: ; preds = %38
%52 = fneg double %21
br label %53
53: ; preds = %51, %53
%54 = phi i32 [ %49, %51 ], [ %56, %53 ]
%55 = tail call i32 @btrfly(i32 %54, double %41, double %43, double %52, double %19, double %46, double %48, double* %2, double* %9, double* %10, double* %11)
%56 = add nsw i32 %54, 2
%57 = icmp slt i32 %56, %50
br i1 %57, label %53, label %58
58: ; preds = %53, %38
%59 = add nsw i32 %17, %6
%60 = add nuw i64 %16, 2
%61 = icmp slt i32 %59, %0
br i1 %61, label %15, label %62
62: ; preds = %58, %4
ret void
}