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Stuart Cook 8628b78f24 Rollup merge of #144232 - xacrimon:explicit-tail-call, r=WaffleLapkin 
Implement support for `become` and explicit tail call codegen for the LLVM backend

This PR implements codegen of explicit tail calls via `become` in `rustc_codegen_ssa` and support within the LLVM backend. Completes a task on (https://github.com/rust-lang/rust/issues/112788). This PR implements all the necessary bits to make explicit tail calls usable, other backends have received stubs for now and will ICE if you use `become` on them. I suspect there is some bikeshedding to be done on how we should go about implementing this for other backends, but it should be relatively straightforward for GCC after this is merged.

During development I also put together a POC bytecode VM based on tail call dispatch to test these changes out and analyze the codegen to make sure it generates expected assembly. That is available [here](https://github.com/xacrimon/tcvm).
2025-07-31 15:42:00 +10:00
..
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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2025-07-22 14:28:48 +02:00
cffi
add codegen test for variadics (also replacing some existing does-this-build tests)
2025-07-23 14:19:14 +02:00
compiletest-self-test
Rename tests/codegen into tests/codegen-llvm
2025-07-22 14:28:48 +02:00
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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2025-07-22 14:28:48 +02:00
enum
Adjust enum-discriminant-eq.rs for LLVM 21
2025-07-29 12:15:38 +02:00
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
2025-07-26 22:45:18 +00:00
issues
Rename tests/codegen into tests/codegen-llvm
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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
Verify llvm-needs-components are not empty and match the --target value
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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
Verify llvm-needs-components are not empty and match the --target value
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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
Verify llvm-needs-components are not empty and match the --target value
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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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become-musttail.rs
Implement support for explicit tail calls in the MIR block builders and the LLVM codegen backend.
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bigint-helpers.rs
Rename tests/codegen into tests/codegen-llvm
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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
Verify llvm-needs-components are not empty and match the --target value
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catch-unwind.rs
Rename tests/codegen into tests/codegen-llvm
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cdylib-external-inline-fns.rs
Rename tests/codegen into tests/codegen-llvm
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cf-protection.rs
Verify llvm-needs-components are not empty and match the --target value
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cfguard-checks.rs
Rename tests/codegen into tests/codegen-llvm
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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
Verify llvm-needs-components are not empty and match the --target value
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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
Rename tests/codegen into tests/codegen-llvm
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const-vector.rs
Fix tests/codegen-llvm/const-vector.rs test failure on riscv64
2025-07-23 11:23:36 +00:00
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
Rename tests/codegen into tests/codegen-llvm
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debug-fndef-size.rs
Rename tests/codegen into tests/codegen-llvm
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debug-limited.rs
Rename tests/codegen into tests/codegen-llvm
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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
Rename tests/codegen into tests/codegen-llvm
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debug-vtable.rs
Rename tests/codegen into tests/codegen-llvm
2025-07-22 14:28:48 +02:00
debuginfo-constant-locals.rs
Rename tests/codegen into tests/codegen-llvm
2025-07-22 14:28:48 +02:00
debuginfo-cyclic-structure.rs
fix(debuginfo): disable overflow check for
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debuginfo-generic-closure-env-names.rs
Rename tests/codegen into tests/codegen-llvm
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debuginfo-inline-callsite-location.rs
Rename tests/codegen into tests/codegen-llvm
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deduced-param-attrs.rs
Rename tests/codegen into tests/codegen-llvm
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default-requires-uwtable.rs
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default-visibility.rs
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direct-access-external-data.rs
Rename tests/codegen into tests/codegen-llvm
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diverging-function-call-debuginfo.rs
tests: Test line number in debuginfo for diverging function calls
2025-07-29 18:59:09 +02:00
dont_codegen_private_const_fn_only_used_in_const_eval.rs
Rename tests/codegen into tests/codegen-llvm
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drop-in-place-noalias.rs
Rename tests/codegen into tests/codegen-llvm
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drop.rs
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dst-offset.rs
Rename tests/codegen into tests/codegen-llvm
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dst-vtable-align-nonzero.rs
Rename tests/codegen into tests/codegen-llvm
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dst-vtable-size-range.rs
Rename tests/codegen into tests/codegen-llvm
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ehcontguard_disabled.rs
Verify llvm-needs-components are not empty and match the --target value
2025-07-29 11:20:23 -07:00
ehcontguard_enabled.rs
Rename tests/codegen into tests/codegen-llvm
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emscripten-catch-unwind-js-eh.rs
Rename tests/codegen into tests/codegen-llvm
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emscripten-catch-unwind-wasm-eh.rs
Rename tests/codegen into tests/codegen-llvm
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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
Rename tests/codegen into tests/codegen-llvm
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force-unwind-tables.rs
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frame-pointer-cli-control.rs
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frame-pointer.rs
Rename tests/codegen into tests/codegen-llvm
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function-arguments-noopt.rs
Rename tests/codegen into tests/codegen-llvm
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function-arguments.rs
Rename tests/codegen into tests/codegen-llvm
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function-return.rs
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gdb_debug_script_load.rs
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generic-debug.rs
Rename tests/codegen into tests/codegen-llvm
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gep-index.rs
Rename tests/codegen into tests/codegen-llvm
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gpu-kernel-abi.rs
Rename tests/codegen into tests/codegen-llvm
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i128-wasm32-callconv.rs
Rename tests/codegen into tests/codegen-llvm
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i128-x86-align.rs
Rename tests/codegen into tests/codegen-llvm
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i128-x86-callconv.rs
Rename tests/codegen into tests/codegen-llvm
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infallible-unwrap-in-opt-z.rs
Rename tests/codegen into tests/codegen-llvm
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inherit_overflow.rs
Rename tests/codegen into tests/codegen-llvm
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inline-always-works-always.rs
Rename tests/codegen into tests/codegen-llvm
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inline-debuginfo.rs
Rename tests/codegen into tests/codegen-llvm
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inline-function-args-debug-info.rs
Rename tests/codegen into tests/codegen-llvm
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inline-hint.rs
Rename tests/codegen into tests/codegen-llvm
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instrument-mcount.rs
Rename tests/codegen into tests/codegen-llvm
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integer-cmp.rs
Rename tests/codegen into tests/codegen-llvm
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integer-overflow.rs
Rename tests/codegen into tests/codegen-llvm
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internalize-closures.rs
Rename tests/codegen into tests/codegen-llvm
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intrinsic-no-unnamed-attr.rs
Rename tests/codegen into tests/codegen-llvm
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is_val_statically_known.rs
Rename tests/codegen into tests/codegen-llvm
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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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2025-07-22 14:28:48 +02:00
llvm-ident.rs
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loads.rs
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2025-07-22 14:28:48 +02:00
local-generics-in-exe-internalized.rs
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2025-07-22 14:28:48 +02:00
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
Verify llvm-needs-components are not empty and match the --target value
2025-07-29 11:20:23 -07:00
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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2025-07-23 02:17:54 +03:00
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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