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Mali Offline Complier provide me with weird result.

TBWorkss

I test it on a very simple fragment shader:

#version 310 es

precision highp float;
precision highp int;
#define HLSLCC_ENABLE_UNIFORM_BUFFERS 1
#if HLSLCC_ENABLE_UNIFORM_BUFFERS
#define UNITY_UNIFORM
#else
#define UNITY_UNIFORM uniform
#endif
#define UNITY_SUPPORTS_UNIFORM_LOCATION 1
#if UNITY_SUPPORTS_UNIFORM_LOCATION
#define UNITY_LOCATION(x) layout(location = x)
#define UNITY_BINDING(x) layout(binding = x, std140)
#else
#define UNITY_LOCATION(x)
#define UNITY_BINDING(x) layout(std140)
#endif
uniform 	mediump float _Cutoff;
UNITY_LOCATION(0) uniform mediump sampler2D _MainTex;
in highp vec2 vs_TEXCOORD0;
layout(location = 0) out mediump vec4 SV_Target0;
mediump vec4 u_xlat16_0;
bool u_xlatb0;
mediump float u_xlat16_1;
void main()
{
    u_xlat16_0 = texture(_MainTex, vs_TEXCOORD0.xy);
    u_xlat16_1 = u_xlat16_0.w + (-_Cutoff);
    SV_Target0 = u_xlat16_0;
#ifdef UNITY_ADRENO_ES3
    u_xlatb0 = !!(u_xlat16_1<0.0);
#else
    u_xlatb0 = u_xlat16_1<0.0;
#endif
    if(u_xlatb0){discard;}
    return;
}

I don't understand why does Mali Offline Complier give me 0% in section "16bit arithmetric"?

All variables are mediump except UV. It should have a relatively high percent of 16bit arithmetric.