aaron.ballman added a comment.
In https://reviews.llvm.org/D44559#1040398, @craig.topper wrote:
> gcc also warns for this
>
> short foo(char a) {
>
> return a * a;
>
> }
>
> Despite the fact that the char would be promoted to int, the upper bits are
> just sign bits and the multiply result still fits in a short.
But it *should* warn if the underlying char type is unsigned, because 255 * 255
= 65025 which is too large to fit into a signed short.
Repository:
rC Clang
https://reviews.llvm.org/D44559
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