#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 */
float cosf(float);
int /*<<< orphan*/ memset(float *, int /*<<< orphan*/, int);
float sinf(float);
void mtxRotateX(float *_result, float _ax) {
  const float sx = sinf(_ax);
  const float cx = cosf(_ax);
  memset(_result, 0, sizeof(float) * 16);
  _result[0] = 1.0f;
  _result[5] = cx;
  _result[6] = -sx;
  _result[9] = sx;
  _result[10] = cx;
  _result[15] = 1.0f;
}


x86 assembly (clang, -O0):
<mtxRotateX>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
movss  %xmm0,-0xc(%rbp)
movss  -0xc(%rbp),%xmm0
call   1030 <sinf@plt>
movss  %xmm0,-0x10(%rbp)
movss  -0xc(%rbp),%xmm0
call   1040 <cosf@plt>
movss  %xmm0,-0x14(%rbp)
mov    -0x8(%rbp),%rdi
xor    %esi,%esi
mov    $0x40,%edx
call   1050 <memset@plt>
mov    -0x8(%rbp),%rax
movss  0xe85(%rip),%xmm0
movss  %xmm0,(%rax)
movss  -0x14(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x14(%rax)
movss  -0x10(%rbp),%xmm0
movd   %xmm0,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x18(%rax)
movss  -0x10(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x24(%rax)
movss  -0x14(%rbp),%xmm0
mov    -0x8(%rbp),%rax
movss  %xmm0,0x28(%rax)
mov    -0x8(%rbp),%rax
movss  0xe30(%rip),%xmm0
movss  %xmm0,0x3c(%rax)
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<mtxRotateX>:
push   %rbx
sub    $0x20,%rsp
movss  %xmm0,0xc(%rsp)
mov    %rdi,%rbx
call   1030 <sinf@plt>
movaps %xmm0,0x10(%rsp)
movss  0xc(%rsp),%xmm0
call   1040 <cosf@plt>
movss  %xmm0,0xc(%rsp)
mov    %rbx,%rdi
xor    %esi,%esi
mov    $0x40,%edx
call   1050 <memset@plt>
movl   $0x3f800000,(%rbx)
movss  0xc(%rsp),%xmm2
movss  %xmm2,0x14(%rbx)
movaps 0xe80(%rip),%xmm0
movaps 0x10(%rsp),%xmm1
xorps  %xmm1,%xmm0
movss  %xmm0,0x18(%rbx)
movss  %xmm1,0x24(%rbx)
movss  %xmm2,0x28(%rbx)
movl   $0x3f800000,0x3c(%rbx)
add    $0x20,%rsp
pop    %rbx
ret

LLVM IR (-O0):
define void @mtxRotateX(float* %0, float %1) {
%3 = alloca float*
%4 = alloca float
%5 = alloca float
%6 = alloca float
store float* %0, float** %3
store float %1, float* %4
%7 = load float, float* %4
%8 = call float @sinf(float %7)
store float %8, float* %5
%9 = load float, float* %4
%10 = call float @cosf(float %9)
store float %10, float* %6
%11 = load float*, float** %3
%12 = call i32 @memset(float* %11, i32 0, i32 64)
%13 = load float*, float** %3
%14 = getelementptr inbounds float, float* %13, i64 0
store float 1.000000e+00, float* %14
%15 = load float, float* %6
%16 = load float*, float** %3
%17 = getelementptr inbounds float, float* %16, i64 5
store float %15, float* %17
%18 = load float, float* %5
%19 = fneg float %18
%20 = load float*, float** %3
%21 = getelementptr inbounds float, float* %20, i64 6
store float %19, float* %21
%22 = load float, float* %5
%23 = load float*, float** %3
%24 = getelementptr inbounds float, float* %23, i64 9
store float %22, float* %24
%25 = load float, float* %6
%26 = load float*, float** %3
%27 = getelementptr inbounds float, float* %26, i64 10
store float %25, float* %27
%28 = load float*, float** %3
%29 = getelementptr inbounds float, float* %28, i64 15
store float 1.000000e+00, float* %29
ret void
}

LLVM IR (-O2):
define void @mtxRotateX(float* %0, float %1) {
%3 = tail call float @sinf(float %1)
%4 = tail call float @cosf(float %1)
%5 = tail call i32 @memset(float* %0, i32 0, i32 64)
store float 1.000000e+00, float* %0
%6 = getelementptr inbounds float, float* %0, i64 5
store float %4, float* %6
%7 = fneg float %3
%8 = getelementptr inbounds float, float* %0, i64 6
store float %7, float* %8
%9 = getelementptr inbounds float, float* %0, i64 9
store float %3, float* %9
%10 = getelementptr inbounds float, float* %0, i64 10
store float %4, float* %10
%11 = getelementptr inbounds float, float* %0, i64 15
store float 1.000000e+00, float* %11
ret void
}