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tint/transform: Implement div / mod polyfill

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Prevents UB for divide-by-zero and integer overflow when dividing

Fixed: tint:1349
Change-Id: Ieef66d27d7aec3011628ced076b2bccc7770a8af
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/108925
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
This commit is contained in:
Ben Clayton
2022-11-09 22:04:11 +00:00
committed by Dawn LUCI CQ
parent 9418152d08
commit 46ee63933c
427 changed files with 7255 additions and 3789 deletions
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8
test/tint/statements/compound_assign/vector/modulo-scalar.wgsl.expected.glsl
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@@ -4,6 +4,11 @@ layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
void unused_entry_point() {
return;
}
ivec4 tint_mod(ivec4 lhs, int rhs) {
ivec4 r = ivec4(rhs);
return (lhs % mix(r, ivec4(1), bvec4(uvec4(equal(r, ivec4(0))) | uvec4(bvec4(uvec4(equal(lhs, ivec4(-2147483648))) & uvec4(equal(r, ivec4(-1))))))));
}
struct S {
ivec4 a;
};
@@ -13,6 +18,7 @@ layout(binding = 0, std430) buffer v_block_ssbo {
} v;
void foo() {
v.inner.a = (v.inner.a % 2);
ivec4 tint_symbol = tint_mod(v.inner.a, 2);
v.inner.a = tint_symbol;
}