#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 */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fscanf(int /*<<< orphan*/ *, char *, float *);
void read_matrix(FILE *fp, int m, int n, float **a) {
  int i, j;
  for (i = 0; i < m; ++i) {
    for (j = 0; j < n; ++j) {
      fscanf(fp, "%f", &a[i][j]);
    }
  }
}


x86 assembly (clang, -O0):
<read_matrix>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    %edx,-0x10(%rbp)
mov    %rcx,-0x18(%rbp)
movl   $0x0,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    1194 <read_matrix+0x84>
movl   $0x0,-0x20(%rbp)
mov    -0x20(%rbp),%eax
cmp    -0x10(%rbp),%eax
jge    1181 <read_matrix+0x71>
mov    -0x8(%rbp),%rdi
mov    -0x18(%rbp),%rax
movslq -0x1c(%rbp),%rcx
mov    (%rax,%rcx,8),%rdx
movslq -0x20(%rbp),%rax
shl    $0x2,%rax
add    %rax,%rdx
lea    0xe92(%rip),%rsi
call   1030 <fscanf@plt>
mov    -0x20(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x20(%rbp)
jmp    1140 <read_matrix+0x30>
jmp    1186 <read_matrix+0x76>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    112d <read_matrix+0x1d>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_matrix>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x18,%rsp
mov    %edx,0xc(%rsp)
test   %esi,%esi
jle    118e <read_matrix+0x7e>
mov    %rcx,%r13
mov    %rdi,%rbp
mov    %esi,%eax
mov    %rax,0x10(%rsp)
mov    0xc(%rsp),%ebx
shl    $0x2,%rbx
xor    %r14d,%r14d
lea    0xebb(%rip),%r15
jmp    115b <read_matrix+0x4b>
nopw   0x0(%rax,%rax,1)
add    $0x1,%r14
cmp    0x10(%rsp),%r14
je     118e <read_matrix+0x7e>
cmpl   $0x0,0xc(%rsp)
jle    1150 <read_matrix+0x40>
xor    %r12d,%r12d
cs nopw 0x0(%rax,%rax,1)
nop
mov    0x0(%r13,%r14,8),%rdx
add    %r12,%rdx
mov    %rbp,%rdi
mov    %r15,%rsi
call   1030 <fscanf@plt>
add    $0x4,%r12
cmp    %r12,%rbx
jne    1170 <read_matrix+0x60>
jmp    1150 <read_matrix+0x40>
add    $0x18,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%f\00"
define void @read_matrix(i32* %0, i32 %1, i32 %2, float** %3) {
%5 = alloca i32*
%6 = alloca i32
%7 = alloca i32
%8 = alloca float**
%9 = alloca i32
%10 = alloca i32
store i32* %0, i32** %5
store i32 %1, i32* %6
store i32 %2, i32* %7
store float** %3, float*** %8
store i32 0, i32* %9
br label %11
11: ; preds = %35, %4
%12 = load i32, i32* %9
%13 = load i32, i32* %6
%14 = icmp slt i32 %12, %13
br i1 %14, label %15, label %38
15: ; preds = %11
store i32 0, i32* %10
br label %16
16: ; preds = %31, %15
%17 = load i32, i32* %10
%18 = load i32, i32* %7
%19 = icmp slt i32 %17, %18
br i1 %19, label %20, label %34
20: ; preds = %16
%21 = load i32*, i32** %5
%22 = load float**, float*** %8
%23 = load i32, i32* %9
%24 = sext i32 %23 to i64
%25 = getelementptr inbounds float*, float** %22, i64 %24
%26 = load float*, float** %25
%27 = load i32, i32* %10
%28 = sext i32 %27 to i64
%29 = getelementptr inbounds float, float* %26, i64 %28
%30 = call i32 @fscanf(i32* %21, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), float* %29)
br label %31
31: ; preds = %20
%32 = load i32, i32* %10
%33 = add nsw i32 %32, 1
store i32 %33, i32* %10
br label %16
34: ; preds = %16
br label %35
35: ; preds = %34
%36 = load i32, i32* %9
%37 = add nsw i32 %36, 1
store i32 %37, i32* %9
br label %11
38: ; preds = %11
ret void
}

LLVM IR (-O2):
@.str = [3 x i8] c"%f\00"
define void @read_matrix(i32* nocapture %0, i32 %1, i32 %2, float** nocapture %3) {
%5 = icmp sgt i32 %1, 0
br i1 %5, label %6, label %24
6: ; preds = %4
%7 = icmp sgt i32 %2, 0
%8 = zext i32 %1 to i64
%9 = zext i32 %2 to i64
br label %10
10: ; preds = %6, %21
%11 = phi i64 [ 0, %6 ], [ %22, %21 ]
br i1 %7, label %12, label %21
12: ; preds = %10
%13 = getelementptr inbounds float*, float** %3, i64 %11
br label %14
14: ; preds = %12, %14
%15 = phi i64 [ 0, %12 ], [ %19, %14 ]
%16 = load float*, float** %13
%17 = getelementptr inbounds float, float* %16, i64 %15
%18 = tail call i32 @fscanf(i32* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), float* %17)
%19 = add nuw nsw i64 %15, 1
%20 = icmp eq i64 %19, %9
br i1 %20, label %21, label %14
21: ; preds = %14, %10
%22 = add nuw nsw i64 %11, 1
%23 = icmp eq i64 %22, %8
br i1 %23, label %24, label %10
24: ; preds = %21, %4
ret void
}