[pixel shader]
#pragma pack_matrix(row_major)
uniform float2x2 r;
#pragma pack_matrix(column_major)
uniform float2x2 c;

float4 main() : sv_target
{
    float4 ret;
    ret.xy = mul(r, float2(0.5, 0.6));
    ret.zw = mul(c, float2(0.5, 0.6));
    return ret;
}

[test]
uniform  0 float4 0.1 0.2 0.0 0.0
uniform  4 float4 0.3 0.4 0.0 0.0
uniform  8 float4 0.1 0.3 0.0 0.0
uniform 12 float4 0.2 0.4 0.0 0.0
draw quad
probe all rgba (0.17, 0.39, 0.17, 0.39) 1

% The documentation claims these strings are subject to macro expansion.
% They are not.

[pixel shader]

#define KEY pack_matrix
#pragma KEY(row_major)
#define VALUE row_major
#pragma pack_matrix(VALUE)
#define PRAGMA pack_matrix(row_major)
#pragma PRAGMA

uniform float2x2 r;

float4 main() : sv_target
{
    float4 ret;
    ret.xy = mul(r, float2(0.5, 0.6));
    ret.zw = 0.5;
    return ret;
}

[test]
uniform  0 float4 0.1 0.2 0.0 0.0
uniform  4 float4 0.3 0.4 0.0 0.0
draw quad
probe all rgba (0.23, 0.34, 0.5, 0.5) 1