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Support bitcasting between scalar and vector types #6104

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#10686
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Support bitcasting between scalar and vector types#6104
#10686
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craneliftIssues related to the Cranelift code generatorcranelift:E-compiler-easyBeginner–Intermediate compiler issues.cranelift:area:aarch64Issues related to AArch64 backend.cranelift:area:riscv64Issues related to the RISC-V 64 backend.cranelift:area:s390xIssues related to Cranelift's s390x backendcranelift:area:x64Issues related to x64 codegen
@bjorn3

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@bjorn3
bjorn3
opened on Mar 27, 2023

Feature

See title. For example v0 = vconst.i64x2 ...; bitcast.i128 little v0.

Benefit

This allows bitcasting between the two without having to go through memory. Cg_clif needs this bitcasting for implementing mem::transmute and float to 128bit int casts on Windows. Currently it has to go through the stack, which is slower and inhibits optimizations.

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    craneliftIssues related to the Cranelift code generatorcranelift:E-compiler-easyBeginner–Intermediate compiler issues.cranelift:area:aarch64Issues related to AArch64 backend.cranelift:area:riscv64Issues related to the RISC-V 64 backend.cranelift:area:s390xIssues related to Cranelift's s390x backendcranelift:area:x64Issues related to x64 codegen

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