Ben Clayton 46ee63933c tint/transform: Implement div / mod polyfill
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>
2022-11-09 22:04:11 +00:00

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#include <metal_stdlib>
using namespace metal;
int tint_mod(int lhs, int rhs) {
return (lhs % select(rhs, 1, bool((rhs == 0) | bool((lhs == (-2147483647 - 1)) & (rhs == -1)))));
}
struct S {
/* 0x0000 */ int a;
};
void foo(device S* const tint_symbol_1) {
int const tint_symbol = tint_mod((*(tint_symbol_1)).a, 2);
(*(tint_symbol_1)).a = tint_symbol;
}