void cat02_to_xyz(double *x, double *y, double *z, double r, double g,
                  double b) {
  *x = (1.096124 * r) - (0.278869 * g) + (0.182745 * b);
  *y = (0.454369 * r) + (0.473533 * g) + (0.072098 * b);
  *z = (-0.009628 * r) - (0.005698 * g) + (1.015326 * b);
}


x86 assembly (clang, -O0):
<cat02_to_xyz>:
push   %rbp
mov    %rsp,%rbp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
movsd  %xmm0,-0x20(%rbp)
movsd  %xmm1,-0x28(%rbp)
movsd  %xmm2,-0x30(%rbp)
movsd  -0x20(%rbp),%xmm1
movsd  0xf14(%rip),%xmm0
mulsd  -0x28(%rbp),%xmm0
movq   %xmm0,%rax
movabs $0x8000000000000000,%rcx
xor    %rcx,%rax
movq   %rax,%xmm0
movsd  0xee8(%rip),%xmm2
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
movsd  -0x30(%rbp),%xmm0
movsd  0xecb(%rip),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
mov    -0x8(%rbp),%rax
movsd  %xmm0,(%rax)
movsd  -0x20(%rbp),%xmm1
movsd  0xea6(%rip),%xmm0
mulsd  -0x28(%rbp),%xmm0
movsd  0xe91(%rip),%xmm2
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
movsd  -0x30(%rbp),%xmm0
movsd  0xe74(%rip),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
mov    -0x10(%rbp),%rax
movsd  %xmm0,(%rax)
movsd  -0x20(%rbp),%xmm1
movsd  0xe4f(%rip),%xmm0
mulsd  -0x28(%rbp),%xmm0
movq   %xmm0,%rax
movabs $0x8000000000000000,%rcx
xor    %rcx,%rax
movq   %rax,%xmm0
movsd  0xe23(%rip),%xmm2
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
movsd  -0x30(%rbp),%xmm0
movsd  0xe06(%rip),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
mov    -0x18(%rbp),%rax
movsd  %xmm0,(%rax)
pop    %rbp
ret

x86 assembly (clang, -O2):
<cat02_to_xyz>:
movsd  0xef8(%rip),%xmm3
mulsd  %xmm1,%xmm3
movsd  0xef4(%rip),%xmm4
mulsd  %xmm0,%xmm4
addsd  %xmm3,%xmm4
movsd  0xeec(%rip),%xmm3
mulsd  %xmm2,%xmm3
addsd  %xmm4,%xmm3
movsd  %xmm3,(%rdi)
movsd  0xee0(%rip),%xmm3
mulsd  %xmm1,%xmm3
movsd  0xedc(%rip),%xmm4
mulsd  %xmm0,%xmm4
addsd  %xmm3,%xmm4
movsd  0xed4(%rip),%xmm3
mulsd  %xmm2,%xmm3
addsd  %xmm4,%xmm3
mulsd  0xecc(%rip),%xmm1
movsd  %xmm3,(%rsi)
mulsd  0xec8(%rip),%xmm0
addsd  %xmm1,%xmm0
mulsd  0xec4(%rip),%xmm2
addsd  %xmm0,%xmm2
movsd  %xmm2,(%rdx)
ret

LLVM IR (-O0):
define void @cat02_to_xyz(double* %0, double* %1, double* %2, double %3, double %4, double %5) {
%7 = alloca double*
%8 = alloca double*
%9 = alloca double*
%10 = alloca double
%11 = alloca double
%12 = alloca double
store double* %0, double** %7
store double* %1, double** %8
store double* %2, double** %9
store double %3, double* %10
store double %4, double* %11
store double %5, double* %12
%13 = load double, double* %10
%14 = load double, double* %11
%15 = fmul double 2.788690e-01, %14
%16 = fneg double %15
%17 = call double @llvm.fmuladd.f64(double 0x3FF189B951C5C572, double %13, double %16)
%18 = load double, double* %12
%19 = call double @llvm.fmuladd.f64(double 1.827450e-01, double %18, double %17)
%20 = load double*, double** %7
store double %19, double* %20
%21 = load double, double* %10
%22 = load double, double* %11
%23 = fmul double 4.735330e-01, %22
%24 = call double @llvm.fmuladd.f64(double 4.543690e-01, double %21, double %23)
%25 = load double, double* %12
%26 = call double @llvm.fmuladd.f64(double 7.209800e-02, double %25, double %24)
%27 = load double*, double** %8
store double %26, double* %27
%28 = load double, double* %10
%29 = load double, double* %11
%30 = fmul double 5.698000e-03, %29
%31 = fneg double %30
%32 = call double @llvm.fmuladd.f64(double 0xBF83B7D84901D191, double %28, double %31)
%33 = load double, double* %12
%34 = call double @llvm.fmuladd.f64(double 0x3FF03EC679CC74B8, double %33, double %32)
%35 = load double*, double** %9
store double %34, double* %35
ret void
}

LLVM IR (-O2):
define void @cat02_to_xyz(double* nocapture writeonly %0, double* nocapture writeonly %1, double* nocapture writeonly %2, double %3, double %4, double %5) {
%7 = fmul double %4, -2.788690e-01
%8 = tail call double @llvm.fmuladd.f64(double %3, double 0x3FF189B951C5C572, double %7)
%9 = tail call double @llvm.fmuladd.f64(double %5, double 1.827450e-01, double %8)
store double %9, double* %0
%10 = fmul double %4, 4.735330e-01
%11 = tail call double @llvm.fmuladd.f64(double %3, double 4.543690e-01, double %10)
%12 = tail call double @llvm.fmuladd.f64(double %5, double 7.209800e-02, double %11)
store double %12, double* %1
%13 = fmul double %4, -5.698000e-03
%14 = tail call double @llvm.fmuladd.f64(double %3, double 0xBF83B7D84901D191, double %13)
%15 = tail call double @llvm.fmuladd.f64(double %5, double 0x3FF03EC679CC74B8, double %14)
store double %15, double* %2
ret void
}