void xyz_to_cat02(double *r, double *g, double *b, double x, double y,
                  double z) {
  *r = (0.7328 * x) + (0.4296 * y) - (0.1624 * z);
  *g = (-0.7036 * x) + (1.6975 * y) + (0.0061 * z);
  *b = (0.0030 * x) + (0.0136 * y) + (0.9834 * z);
}


x86 assembly (clang, -O0):
<xyz_to_cat02>:
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
movsd  0xeff(%rip),%xmm2
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
movsd  -0x30(%rbp),%xmm0
movsd  0xee2(%rip),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
mov    -0x8(%rbp),%rax
movsd  %xmm0,(%rax)
movsd  -0x20(%rbp),%xmm1
movsd  0xebd(%rip),%xmm0
mulsd  -0x28(%rbp),%xmm0
movsd  0xea8(%rip),%xmm2
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
movsd  -0x30(%rbp),%xmm0
movsd  0xe8b(%rip),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
mov    -0x10(%rbp),%rax
movsd  %xmm0,(%rax)
movsd  -0x20(%rbp),%xmm1
movsd  0xe66(%rip),%xmm0
mulsd  -0x28(%rbp),%xmm0
movsd  0xe51(%rip),%xmm2
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
movsd  -0x30(%rbp),%xmm0
movsd  0xe34(%rip),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
mov    -0x18(%rbp),%rax
movsd  %xmm0,(%rax)
pop    %rbp
ret

x86 assembly (clang, -O2):
<xyz_to_cat02>:
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 @xyz_to_cat02(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 4.296000e-01, %14
%16 = call double @llvm.fmuladd.f64(double 7.328000e-01, double %13, double %15)
%17 = load double, double* %12
%18 = call double @llvm.fmuladd.f64(double -1.624000e-01, double %17, double %16)
%19 = load double*, double** %7
store double %18, double* %19
%20 = load double, double* %10
%21 = load double, double* %11
%22 = fmul double 1.697500e+00, %21
%23 = call double @llvm.fmuladd.f64(double -7.036000e-01, double %20, double %22)
%24 = load double, double* %12
%25 = call double @llvm.fmuladd.f64(double 6.100000e-03, double %24, double %23)
%26 = load double*, double** %8
store double %25, double* %26
%27 = load double, double* %10
%28 = load double, double* %11
%29 = fmul double 1.360000e-02, %28
%30 = call double @llvm.fmuladd.f64(double 3.000000e-03, double %27, double %29)
%31 = load double, double* %12
%32 = call double @llvm.fmuladd.f64(double 9.834000e-01, double %31, double %30)
%33 = load double*, double** %9
store double %32, double* %33
ret void
}

LLVM IR (-O2):
define void @xyz_to_cat02(double* nocapture writeonly %0, double* nocapture writeonly %1, double* nocapture writeonly %2, double %3, double %4, double %5) {
%7 = fmul double %4, 4.296000e-01
%8 = tail call double @llvm.fmuladd.f64(double %3, double 7.328000e-01, double %7)
%9 = tail call double @llvm.fmuladd.f64(double %5, double -1.624000e-01, double %8)
store double %9, double* %0
%10 = fmul double %4, 1.697500e+00
%11 = tail call double @llvm.fmuladd.f64(double %3, double -7.036000e-01, double %10)
%12 = tail call double @llvm.fmuladd.f64(double %5, double 6.100000e-03, double %11)
store double %12, double* %1
%13 = fmul double %4, 1.360000e-02
%14 = tail call double @llvm.fmuladd.f64(double %3, double 3.000000e-03, double %13)
%15 = tail call double @llvm.fmuladd.f64(double %5, double 9.834000e-01, double %14)
store double %15, double* %2
ret void
}