6fb520fcd5
- Values from constant variables are folded in when it helps, e.g.:
const bool SHINY = true;
const float SHININESS = 2;
if (!SHINY) { // <-- optimizes directly to `false`
param = -SHININESS; // <-- optimizes to `-2`
- Doubled-up logical-not and negation are stripped:
y = -(-x); // <-- optimizes to `y = x;`
b = !!a; // <-- optimizes to `b = a;`
Removal of doubled-up negation and logical-not was actually never
implemented in the constant-propagation phase; I just noticed it while
I was here and thinking about it.
Change-Id: Ie28bb9b5af91376f03d926e26e37f4a131bbf550
Bug: skia:11343
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/379298
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
25 lines
548 B
Plaintext
25 lines
548 B
Plaintext
uniform half4 colorGreen, colorRed;
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half4 main() {
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float x = 1, y = 2;
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int z = 3;
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x = x - x + y * x * x * (y - x);
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y = x / y / x;
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z = (z / 2 * 3 + 4) - 2;
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bool b = (x > 4) == x < 2 || 2 >= sqrt(2) && y <= x;
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bool c = sqrt(2) > 2;
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bool d = b ^^ !!c;
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bool e = b && c;
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bool f = !!b || c;
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x += 12;
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x -= 12;
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x *= y /= 10;
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x = 6;
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y = float(b) * float(c) * float(d) * float(e) * float(f);
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y = 6;
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z = z - 1;
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z = 6;
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return (x == 6 && y == 6 && z == 6) ? colorGreen : colorRed;
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}
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