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bors 283a0746a2 Auto merge of #143860 - scottmcm:transmute-always-rvalue, r=WaffleLapkin 
Let `codegen_transmute_operand` just handle everything

When combined with rust-lang/rust#143720, this means `rvalue_creates_operand` can just return `true` for *every* `Rvalue`.  (A future PR could consider removing it, though just letting it optimize out is fine for now.)

It's nicer anyway, IMHO, because it avoids needing the layout checks to be consistent in the two places, and thus is an overall reduction in code.  Plus it's a more helpful building block when used in other places this way.

(TBH, it probably would have been better to have it this way the whole time, but I clearly didn't understand `rvalue_creates_operand` when I originally wrote rust-lang/rust#109843.)
2025-07-26 22:45:18 +00:00
..
asm
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autodiff
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autovec
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auxiliary
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avr
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bounds-checking
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cffi
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compiletest-self-test
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cross-crate-inlining
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debug-accessibility
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debuginfo-proc-macro
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dllimports
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enum
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ergonomic-clones
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float
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gpu_offload
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hint
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instrument-coverage
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instrument-xray
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intrinsics
Auto merge of #143860 - scottmcm:transmute-always-rvalue, r=WaffleLapkin
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issues
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lib-optimizations
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loongarch-abi
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macos
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meta-filecheck
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naked-fn
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non-terminate
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option-niche-unfixed
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patchable-function-entry
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remap_path_prefix
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repr
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riscv-abi
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sanitizer
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simd
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simd-intrinsic
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src-hash-algorithm
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unwind-abis
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aarch64-softfloat.rs
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aarch64-struct-align-128.rs
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abi-efiapi.rs
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abi-main-signature-16bit-c-int.rs
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abi-main-signature-32bit-c-int.rs
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abi-repr-ext.rs
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abi-sysv64.rs
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abi-win64-zst.rs
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abi-x86_64_sysv.rs
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abi-x86-interrupt.rs
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abi-x86-sse.rs
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addr-of-mutate.rs
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adjustments.rs
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align-byval-alignment-mismatch.rs
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align-byval-vector.rs
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align-byval.rs
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align-enum.rs
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align-fn.rs
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align-offset.rs
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align-struct.rs
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alloc-optimisation.rs
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amdgpu-addrspacecast.rs
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array-clone.rs
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array-cmp.rs
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array-codegen.rs
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array-equality.rs
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array-from_fn.rs
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array-map.rs
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array-optimized.rs
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array-repeat.rs
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ascii-char.rs
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assign-desugar-debuginfo.rs
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async-closure-debug.rs
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async-fn-debug-awaitee-field.rs
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async-fn-debug-msvc.rs
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async-fn-debug.rs
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atomic-operations.rs
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atomicptr.rs
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autodiffv2.rs
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autovectorize-f32x4.rs
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bigint-helpers.rs
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binary-heap-peek-mut-pop-no-panic.rs
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binary-search-index-no-bound-check.rs
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bool-cmp.rs
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box-default-debug-copies.rs
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box-uninit-bytes.rs
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bpf-alu32.rs
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branch-protection.rs
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call-llvm-intrinsics.rs
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call-tmps-lifetime.rs
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cast-optimized.rs
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cast-target-abi.rs
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catch-unwind.rs
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cdylib-external-inline-fns.rs
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cf-protection.rs
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cfguard-checks.rs
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cfguard-disabled.rs
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cfguard-nochecks.rs
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cfguard-non-msvc.rs
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char-ascii-branchless.rs
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char-escape-debug-no-bounds-check.rs
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checked_ilog.rs
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checked_math.rs
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clone_as_copy.rs
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clone-shims.rs
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codemodels.rs
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coercions.rs
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cold-call-declare-and-call.rs
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common_prim_int_ptr.rs
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comparison-operators-2-struct.rs
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comparison-operators-2-tuple.rs
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comparison-operators-newtype.rs
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const_scalar_pair.rs
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const-array.rs
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const-vector.rs
Fix tests/codegen-llvm/const-vector.rs test failure on riscv64
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constant-branch.rs
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consts.rs
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coroutine-debug-msvc.rs
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coroutine-debug.rs
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dealloc-no-unwind.rs
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debug-alignment.rs
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debug-column-msvc.rs
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debug-column.rs
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debug-compile-unit-path.rs
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debug-fndef-size.rs
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debug-limited.rs
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debug-line-directives-only.rs
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debug-line-tables-only.rs
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debug-linkage-name.rs
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debug-vtable.rs
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debuginfo-constant-locals.rs
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debuginfo-generic-closure-env-names.rs
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debuginfo-inline-callsite-location.rs
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deduced-param-attrs.rs
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default-requires-uwtable.rs
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default-visibility.rs
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direct-access-external-data.rs
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dont_codegen_private_const_fn_only_used_in_const_eval.rs
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drop-in-place-noalias.rs
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drop.rs
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dst-offset.rs
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dst-vtable-align-nonzero.rs
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dst-vtable-size-range.rs
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ehcontguard_disabled.rs
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ehcontguard_enabled.rs
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emscripten-catch-unwind-js-eh.rs
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emscripten-catch-unwind-wasm-eh.rs
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enable-lto-unit-splitting.rs
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error-provide.rs
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export-no-mangle.rs
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external-no-mangle-fns.rs
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external-no-mangle-statics.rs
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f128-wasm32-callconv.rs
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fastcall-inreg.rs
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fatptr.rs
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fewer-names.rs
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fixed-x18.rs
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float_math.rs
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fn-impl-trait-self.rs
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fn-parameters-on-different-lines-debuginfo.rs
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force-frame-pointers.rs
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force-no-unwind-tables.rs
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force-unwind-tables.rs
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frame-pointer-cli-control.rs
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frame-pointer.rs
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function-arguments-noopt.rs
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function-arguments.rs
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function-return.rs
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gdb_debug_script_load.rs
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generic-debug.rs
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gep-index.rs
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gpu-kernel-abi.rs
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i128-wasm32-callconv.rs
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i128-x86-align.rs
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i128-x86-callconv.rs
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infallible-unwrap-in-opt-z.rs
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inherit_overflow.rs
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inline-always-works-always.rs
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inline-debuginfo.rs
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inline-function-args-debug-info.rs
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inline-hint.rs
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instrument-mcount.rs
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integer-cmp.rs
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integer-overflow.rs
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internalize-closures.rs
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intrinsic-no-unnamed-attr.rs
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is_val_statically_known.rs
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issue-97217.rs
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iter-repeat-n-trivial-drop.rs
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layout-size-checks.rs
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lifetime_start_end.rs
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link_section.rs
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link-dead-code.rs
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llvm_module_flags.rs
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llvm-ident.rs
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loads.rs
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local-generics-in-exe-internalized.rs
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lto-removes-invokes.rs
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mainsubprogram.rs
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match-optimized.rs
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match-optimizes-away.rs
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match-unoptimized.rs
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maybeuninit-rvo.rs
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mem-replace-big-type.rs
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mem-replace-simple-type.rs
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merge-functions.rs
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method-declaration.rs
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min-function-alignment.rs
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mir_zst_stores.rs
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mir-aggregate-no-alloca.rs
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mir-inlined-line-numbers.rs
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move-before-nocapture-ref-arg.rs
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move-operands.rs
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naked-asan.rs
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no_builtins-at-crate.rs
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no-alloca-inside-if-false.rs
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no-assumes-on-casts.rs
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no-dllimport-w-cross-lang-lto.rs
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no-jump-tables.rs
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no-plt.rs
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no-redundant-item-monomorphization.rs
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noalias-box-off.rs
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noalias-box.rs
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noalias-flag.rs
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noalias-freeze.rs
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noalias-refcell.rs
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noalias-rwlockreadguard.rs
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noalias-unpin.rs
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noreturn-uninhabited.rs
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noreturnflag.rs
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nounwind.rs
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nrvo.rs
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optimize-attr-1.rs
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option-as-slice.rs
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option-niche-eq.rs
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overaligned-constant.rs
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packed.rs
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panic-abort-windows.rs
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panic-in-drop-abort.rs
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panic-unwind-default-uwtable.rs
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pattern_type_symbols.rs
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personality_lifetimes.rs
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pgo-counter-bias.rs
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pgo-instrumentation.rs
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pic-relocation-model.rs
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pie-relocation-model.rs
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placement-new.rs
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powerpc64le-struct-align-128.rs
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precondition-checks.rs
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ptr-arithmetic.rs
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ptr-read-metadata.rs
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range_to_inclusive.rs
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range-attribute.rs
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range-loop.rs
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README.md
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refs.rs
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reg-struct-return.rs
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regparm-inreg.rs
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repeat-operand-zero-len.rs
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repeat-operand-zst-elem.rs
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repeat-trusted-len.rs
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retpoline.rs
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riscv-target-abi.rs
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rust-abi-arch-specific-adjustment.rs
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s390x-simd.rs
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scalar-pair-bool.rs
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set-discriminant-invalid.rs
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skip-mono-inside-if-false.rs
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slice_as_from_ptr_range.rs
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slice-as_chunks.rs
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slice-indexing.rs
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slice-init.rs
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slice-is-ascii.rs
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slice-iter-fold.rs
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slice-iter-len-eq-zero.rs
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slice-iter-nonnull.rs
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slice-last-elements-optimization.rs
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slice-pointer-nonnull-unwrap.rs
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slice-position-bounds-check.rs
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slice-ref-equality.rs
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slice-reverse.rs
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slice-split-at.rs
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slice-windows-no-bounds-check.rs
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some-abis-do-extend-params-to-32-bits.rs
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some-global-nonnull.rs
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sparc-struct-abi.rs
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split-lto-unit.rs
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sroa-fragment-debuginfo.rs
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sse42-implies-crc32.rs
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stack-probes-inline.rs
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stack-protector.rs
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static-relocation-model-msvc.rs
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staticlib-external-inline-fns.rs
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step_by-overflow-checks.rs
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stores.rs
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string-push.rs
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swap-large-types.rs
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swap-small-types.rs
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target-cpu-on-functions.rs
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target-feature-inline-closure.rs
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target-feature-negative-implication.rs
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target-feature-overrides.rs
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terminating-catchpad.rs
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thread-local.rs
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tied-features-strength.rs
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to_vec.rs
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trailing_zeros.rs
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transmute-optimized.rs
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transmute-scalar.rs
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try_question_mark_nop.rs
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tune-cpu-on-functions.rs
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tuple-layout-opt.rs
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ub-checks.rs
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unchecked_shifts.rs
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unchecked-float-casts.rs
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uninhabited-transparent-return-abi.rs
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uninit-consts.rs
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uninit-repeat-in-aggregate.rs
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union-abi.rs
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union-aggregate.rs
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unwind-and-panic-abort.rs
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unwind-extern-exports.rs
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unwind-extern-imports.rs
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unwind-landingpad-cold.rs
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unwind-landingpad-inline.rs
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used_with_arg.rs
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var-names.rs
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vec_pop_push_noop.rs
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vec-as-ptr.rs
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vec-calloc.rs
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vec-in-place.rs
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vec-iter-collect-len.rs
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vec-iter.rs
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vec-len-invariant.rs
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vec-optimizes-away.rs
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vec-reserve-extend.rs
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vec-shrink-panik.rs
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vec-with-capacity.rs
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vecdeque_no_panic.rs
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vecdeque_pop_push.rs
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vecdeque-drain.rs
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vecdeque-nonempty-get-no-panic.rs
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virtual-call-attrs-issue-137646.rs
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virtual-function-elimination-32bit.rs
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virtual-function-elimination.rs
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vtable-loads.rs
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vtable-upcast.rs
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wasm_casts_trapping.rs
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wasm_exceptions.rs
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zip.rs
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zst-offset.rs
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README.md

The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb
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