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riscv64: improve unordered comparison generated code (#5636)

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Improve the generated code for unordered floating point comparisons by negating the comparison and inveritng the branches. This allows us to pick the unordered versions, which generate significantly better code.
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Trevor Elliott
2023-01-25 17:28:28 -08:00
committed by GitHub
parent 4ad86752de
commit 7926808e8e
4 changed files with 71 additions and 6 deletions
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cranelift/codegen/src/prelude.isle
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@@ -225,6 +225,10 @@
(decl floatcc_inverse (FloatCC) FloatCC)
(extern constructor floatcc_inverse floatcc_inverse)
;; True when this FloatCC involves an unordered comparison.
(decl pure floatcc_unordered (FloatCC) bool)
(extern constructor floatcc_unordered floatcc_unordered)
;;;; Helper Clif Extractors ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; An extractor that only matches types that can fit in 16 bits.