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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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6
test/tint/statements/compound_assign/function.wgsl.expected.glsl
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@@ -4,11 +4,15 @@ layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
void unused_entry_point() {
return;
}
int tint_div(int lhs, int rhs) {
return (lhs / (bool(uint((rhs == 0)) | uint(bool(uint((lhs == -2147483648)) & uint((rhs == -1))))) ? 1 : rhs));
}
void foo() {
int a = 0;
vec4 b = vec4(0.0f, 0.0f, 0.0f, 0.0f);
mat2 c = mat2(0.0f, 0.0f, 0.0f, 0.0f);
a = (a / 2);
a = tint_div(a, 2);
b = (b * mat4(vec4(0.0f), vec4(0.0f), vec4(0.0f), vec4(0.0f)));
c = (c * 2.0f);
}