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Add getDemandedBits method for uses so we can query demanded bits for each use. This can help getting better use information. For example, for the code below define i32 @test_use(i32 %a) { %1 = and i32 %a, -256 %2 = or i32 %1, 1 %3 = trunc i32 %2 to i8 (didn't optimize this to 1 for illustration purpose) ... some use of %3 ret %2 } if we look at the demanded bit of %2 (which is all 32 bits because of the return), we would conclude that %a is used regardless of how its return is used. However, if we look at each use separately, we will see that the demanded bit of %2 in trunc only uses the lower 8 bits of %a which is redefined, therefore %a's usage depends on how the function return is used. Reviewed By: RKSimon Differential Revision: https://reviews.llvm.org/D97074 |
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