skia2/tests/sksl/metal/SwizzleHelper.metal
John Stiles 2654187396 Eliminate unused local variables during SkSL optimization.
This can eliminate const variables which have been completely folded
away, unnecessary synthetic variables created during codegen/inlining,
or code that simply didn't need to exist at all.

Change-Id: I37a65e455e6527a6a6c2f4dde918f48d84dc2638
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/383496
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2021-03-16 17:22:53 +00:00

41 lines
1.4 KiB
Metal

#include <metal_stdlib>
#include <simd/simd.h>
using namespace metal;
struct Inputs {
};
struct Outputs {
float4 sk_FragColor [[color(0)]];
};
struct Globals {
float2 glob;
};
float4 fn(thread Outputs& _out, thread Globals& _globals, float a, thread float2& b, thread float2& c, thread float3& d);
float4 _skOutParamHelper0_fn(thread Outputs& _out, thread Globals& _globals, float _var0, thread float3& b, thread float2& glob, thread float3x3& d) {
float2 _var1;
float2 _var2 = glob.yx;
float3 _var3 = d[1].zyx;
float4 _skResult = fn(_out, _globals, _var0, _var1, _var2, _var3);
b.yz = _var1;
glob.yx = _var2;
d[1].zyx = _var3;
return _skResult;
}
float4 fn(thread Outputs& _out, thread Globals& _globals, float a, thread float2& b, thread float2& c, thread float3& d) {
a = _out.sk_FragColor.x + a;
b = _out.sk_FragColor.yz - _globals.glob.y;
c *= a;
d = _out.sk_FragColor.www / d;
return float4(a, b.x, c.y, d.x);
}
fragment Outputs fragmentMain(Inputs _in [[stage_in]], bool _frontFacing [[front_facing]], float4 _fragCoord [[position]]) {
Globals _globals{float2(1.0)};
(void)_globals;
Outputs _out;
(void)_out;
float2 a = float2(1.0);
float3 b = float3(2.0);
float3x3 d = float3x3(4.0);
_out.sk_FragColor = _skOutParamHelper0_fn(_out, _globals, a.x, b, _globals.glob, d);
return _out;
}