skia2/resources/sksl/runtime_errors/IllegalIndexing.rts
John Stiles edac7716aa Evaluate single-argument generic intrinsics at compile time.
In particular, this optimizes abs() and sign() when all inputs are known
at compile time. This resolves a TODO on a test case in
`IllegalIndexing.rts`.

Change-Id: Ica310522a85b42dc7ae255bd25004a6629d04176
Bug: skia:10835
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/405676
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2021-05-10 14:50:50 +00:00

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// Expect 3 errors
// Legal cases that should not produce errors:
void literal_index() { int a[2]; a[0] = 0; a[1] = a[0]; }
void const_var_index() { int a[2]; const int b = 0; a[b] = 0; }
void loop_index() { int a[2]; for (int i = 0; i < 2; ++i) { a[i] = i; } }
void loop_expr_binary() { int a[2]; for (int i = 0; i < 2; ++i) { a[1 - i] = i; } }
void loop_expr_unary() { int a[2]; for (int i = 0; i > -2; --i) { a[-i] = i; } }
void loop_swizzle() { int a[2]; for (int i = 0; i < 2; ++i) { a[i.x] = i; } }
void loop_ternary() { int a[2]; for (int i = 0; i < 2; ++i) { a[i > 0 ? i : 0] = i; } }
void loop_type_coerce() { float a[2]; for (float i = 0; i < 2; ++i) { a[int(i)] = i; } }
void loop_nested() {
int a[3];
for (int i = 0; i < 2; ++i)
for (int j = 0; j < 2; ++j) {
a[i + j] = j;
}
}
uniform int u;
// Illegal cases that should produce errors:
void uniform_index() { int a[2]; a[u] = 0; }
void param_index(int p) { int a[2]; a[p] = 0; }
// Legal in SkSL when optimization is enabled:
void func_index() { int a[2]; a[int(abs(-1))] = 0; }