[Codegen][GPU] Let integer range optimization narrow GPU computations to i32 #19473
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compiler/src/iree/compiler/Dialect/Util/Transforms/OptimizeIntArithmetic.cpp
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This pass goes into an infinite loop sometimes Repro: https://gist.github.com/Groverkss/33313b03fd6cb600553ef511f9e7c6a5 |
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Note: This PR is stacked on top of #19372, and so looks bigger than it is. The relevant changes are in the last commit.
Add an option to -iree-util-optimize-int-arithmetic to have it perform computations in i32 where possible, which is enabled when optimizing arithmetic for GPU codegen. This allows LLVM co correctly conclude that various computations don't need to be done at full 64-bit precision, thus saving registers and instructions. (LLVM has some rewrites for this, but they're, for example, gated on only having one use of the potentially-truncated value, which means that shared math stays in an over-wide data type).