[llvm] [RISCV][GISel] Do libcall for G_FPTOSI, G_FPTOUI when no D or F support (PR #94613)

[Craig Topper via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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topperc wrote:

We need an rv64 test too

https://github.com/llvm/llvm-project/pull/94613