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Tony Kan 97bd985467 fix(abi): Restore noundef on PassMode::Cast args in Rust ABI 
`adjust_for_rust_abi` was casting small aggregates to an integer register
without propagating `noundef`, causing a performance regression (#123183)
— LLVM could no longer assume the bits were fully defined.

Add `layout_is_noundef` (conservative) + `fields_are_noundef` helper,
then use `cast_to_with_attrs` to forward `NoUndef` when proven:

  Scalar     → `!is_uninit_valid()`
  ScalarPair → both scalars valid + `s1.size + s2.size == layout.size`
               (size equality rejects layouts with inter-scalar padding)
  Array      → recurse into element; empty arrays unconditionally noundef
  Arbitrary  → `Variants::Single` required; walk fields in offset order —
               any gap, non-noundef field, or trailing pad returns false
  Union / Primitive / Simd → false (conservative)

Bless `pass-indirectly-attr.stderr` and `debuginfo-dse.rs` for the new
attribute on Cast args. Add `tests/codegen-llvm/abi-noundef-cast.rs`
covering positive Cast cases (arrays, plain structs, single-variant enum)
and negative Cast cases (MaybeUninit, multi-variant enum, field/pair gap,
trailing padding).

Fixes #123183.

Co-authored-by: Ralf Jung <post@ralfj.de>
2026-02-27 12:08:59 -08:00
..
cross-crate
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
extern
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
foreign
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
issues
On unmet trait bound, mention if trait is unstable
2026-01-13 01:16:58 +00:00
mir
Update test directives for wasm32-wasip1
2024-03-11 09:36:35 -07:00
numbers-arithmetic
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00
statics
Update tests for hidden references to mutable static
2024-09-13 14:10:56 +03:00
struct-enums
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00
union
Update test directives for wasm32-wasip1
2024-03-11 09:36:35 -07:00
abi-sysv64-arg-passing.rs
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00
abi-sysv64-register-usage.rs
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00
abi-typo-unstable.feature_disabled.stderr
update/bless tests
2025-04-06 21:41:47 +02:00
abi-typo-unstable.feature_enabled.stderr
update/bless tests
2025-04-06 21:41:47 +02:00
abi-typo-unstable.rs
update/bless tests
2025-04-06 21:41:47 +02:00
anon-extern-mod.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
arm-unadjusted-intrinsic.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
avr-sram.disable_sram.stderr
Require sram target feature on AVR
2026-02-06 09:29:24 +09:00
avr-sram.no_sram.stderr
Require sram target feature on AVR
2026-02-06 09:29:24 +09:00
avr-sram.rs
Require sram target feature on AVR
2026-02-06 09:29:24 +09:00
bad-custom.rs
Error on invalid signatures for interrupt ABIs
2025-06-24 14:40:11 +02:00
bad-custom.stderr
setup CI and tidy to use typos for spellchecking and fix few typos
2025-07-03 10:51:06 +03:00
c-stack-as-value.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
c-stack-returning-int64.rs
Use the rustc_private libc less in tests
2024-04-15 08:54:11 -04:00
c-zst.aarch64-darwin.stderr
layout: Store inverse memory index in FieldsShape::Arbitrary
2025-12-18 22:25:34 +01:00
c-zst.powerpc-linux.stderr
layout: Store inverse memory index in FieldsShape::Arbitrary
2025-12-18 22:25:34 +01:00
c-zst.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
c-zst.s390x-linux.stderr
layout: Store inverse memory index in FieldsShape::Arbitrary
2025-12-18 22:25:34 +01:00
c-zst.sparc64-linux.stderr
layout: Store inverse memory index in FieldsShape::Arbitrary
2025-12-18 22:25:34 +01:00
c-zst.x86_64-linux.stderr
layout: Store inverse memory index in FieldsShape::Arbitrary
2025-12-18 22:25:34 +01:00
c-zst.x86_64-pc-windows-gnu.stderr
layout: Store inverse memory index in FieldsShape::Arbitrary
2025-12-18 22:25:34 +01:00
cabi-int-widening.rs
Update test directives for wasm32-wasip1
2024-03-11 09:36:35 -07:00
cannot-be-called.amdgpu.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.avr.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.i686.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.msp430.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.nvptx.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.riscv32.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.riscv64.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.rs
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.x64_win.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-called.x64.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.amdgpu.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.avr.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.i686.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.msp430.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.nvptx.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.riscv32.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.riscv64.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.rs
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.x64_win.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-be-coroutine.x64.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-return.amdgpu.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-return.nvptx.stderr
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
cannot-return.rs
Add checks for gpu-kernel calling conv
2026-01-01 18:34:24 +01:00
compatibility.rs
sparc64: enable abi compatibility test
2026-02-12 12:42:39 +01:00
custom.rs
add extern "custom" functions
2025-06-12 20:27:10 +02:00
debug.generic.stderr
Parse #[rustc_abi(..)]
2026-02-05 19:07:50 +00:00
debug.loongarch64.stderr
Parse #[rustc_abi(..)]
2026-02-05 19:07:50 +00:00
debug.riscv64.stderr
Parse #[rustc_abi(..)]
2026-02-05 19:07:50 +00:00
debug.rs
Parse #[rustc_abi(..)]
2026-02-05 19:07:50 +00:00
explicit_repr_rust.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
extern-c-two-doubles-x86_64-5754.rs
Rehome tests/ui/issues/ tests [3/?]
2025-08-04 16:43:53 -04:00
fixed_x18.rs
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
homogenous-floats-target-feature-mixup.rs
Add support for //@ ignore-i586
2025-10-21 12:39:49 +11:00
interrupt-invalid-signature.avr.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
interrupt-invalid-signature.i686.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
interrupt-invalid-signature.msp430.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
interrupt-invalid-signature.riscv32.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
interrupt-invalid-signature.riscv64.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
interrupt-invalid-signature.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
interrupt-invalid-signature.x64.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
interrupt-returns-never-or-unit.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
invalid-call-abi-ctfe.rs
Taint body on invalid call ABI
2025-06-24 22:43:00 +00:00
invalid-call-abi-ctfe.stderr
Taint body on invalid call ABI
2025-06-24 22:43:00 +00:00
invalid-call-abi.rs
Add rust-invalid ABI
2025-06-24 22:34:30 +00:00
invalid-call-abi.stderr
Add rust-invalid ABI
2025-06-24 22:34:30 +00:00
invalid-self-parameter-type-56806.rs
Add test batch 3
2025-09-12 14:45:12 -04:00
invalid-self-parameter-type-56806.stderr
Add test batch 3
2025-09-12 14:45:12 -04:00
issue-28676.rs
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00
large-byval-align.rs
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00
non-rustic-unsized.rs
error on non-rustic ABIs using unsized parameters
2025-11-05 12:12:10 +01:00
non-rustic-unsized.stderr
error on non-rustic ABIs using unsized parameters
2025-11-05 12:12:10 +01:00
nullable-pointer-ffi-compat.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
pass-indirectly-attr.rs
additional tests for pass_indirectly_in_non_rustic_abis
2025-11-04 10:05:02 +01:00
pass-indirectly-attr.stderr
fix(abi): Restore noundef on PassMode::Cast args in Rust ABI
2026-02-27 12:08:59 -08:00
relocation_model_pic.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
riscv-discoverability-guidance.riscv32.stderr
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
riscv-discoverability-guidance.riscv64.stderr
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
riscv-discoverability-guidance.rs
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
rust-cold-works-with-rustic-args.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
rust-preserve-none-cc.rs
abi: add a rust-preserve-none calling convention
2026-01-24 19:23:17 +02:00
rustcall-generic.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
s390x-softfloat-gate.disable-softfloat.stderr
add tests for s390x-unknown-none-softfloat
2026-02-09 09:29:16 +01:00
s390x-softfloat-gate.enable-softfloat.stderr
add tests for s390x-unknown-none-softfloat
2026-02-09 09:29:16 +01:00
s390x-softfloat-gate.rs
add tests for s390x-unknown-none-softfloat
2026-02-09 09:29:16 +01:00
segfault-no-out-of-stack.rs
Ignore more failing ui tests in GCC backend
2025-10-13 15:20:49 +02:00
shadow-call-stack-without-fixed-x18.rs
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
simd-abi-checks-avx.rs
Remove uses of #[feature(avx512_target_feature)]
2025-05-18 11:12:25 +05:30
simd-abi-checks-avx.stderr
Remove uses of #[feature(avx512_target_feature)]
2025-05-18 11:12:25 +05:30
simd-abi-checks-empty-list.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
simd-abi-checks-empty-list.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
simd-abi-checks-s390x.rs
stabilize s390x_target_feature_vector
2025-11-06 12:49:48 +01:00
simd-abi-checks-s390x.z10.stderr
stabilize s390x_target_feature_vector
2025-11-06 12:49:48 +01:00
simd-abi-checks-s390x.z13_no_vector.stderr
stabilize s390x_target_feature_vector
2025-11-06 12:49:48 +01:00
simd-abi-checks-s390x.z13_soft_float.stderr
add tests for s390x-unknown-none-softfloat
2026-02-09 09:29:16 +01:00
simd-abi-checks-sse.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
simd-abi-checks-sse.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
sparcv8plus.rs
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
sparcv8plus.sparc_cpu_v9_feature_v8plus.stderr
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
sparcv8plus.sparc_cpu_v9.stderr
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
sparcv8plus.sparc_feature_v8plus.stderr
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
sparcv8plus.sparc.stderr
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
sparcv8plus.sparcv8plus.stderr
Move warning reporting from flag_to_backend_features to cfg_target_feature
2025-11-05 10:48:29 +00:00
stack-probes-lto.rs
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00
stack-probes.rs
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00
stack-protector.rs
Allow function_casts_as_integer in non-related ui tests
2025-11-10 16:38:28 +01:00
sysv64-zst.rs
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
sysv64-zst.stderr
layout: Store inverse memory index in FieldsShape::Arbitrary
2025-12-18 22:25:34 +01:00
unsized-args-in-c-abi-issues-94223-115845.rs
Delete tuple unsizing
2025-02-27 10:26:33 +00:00
unsupported-abi-transmute.rs
tests: migrate unsupported-abi-transmute.rs to extern "rust-invalid"
2025-06-25 00:54:02 -07:00
unsupported-abi-transmute.stderr
tests: migrate unsupported-abi-transmute.rs to extern "rust-invalid"
2025-06-25 00:54:02 -07:00
unsupported-in-impls.rs
tests: migrate unsupported-abi-transmute.rs to extern "rust-invalid"
2025-06-25 00:54:02 -07:00
unsupported-in-impls.stderr
tests: split out unsupported-in-impls.rs
2025-06-25 00:54:02 -07:00
unsupported-varargs-fnptr.rs
stabilize extended_varargs_abi_support
2025-09-02 08:48:12 +02:00
unsupported-varargs-fnptr.stderr
stabilize extended_varargs_abi_support
2025-09-02 08:48:12 +02:00
unsupported.aarch64.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
unsupported.arm.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
unsupported.i686.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
unsupported.riscv32.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
unsupported.riscv64.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
unsupported.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
unsupported.x64_win.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
unsupported.x64.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
variadic-ffi.rs
Rework c_variadic
2025-12-04 10:51:34 +01:00
vectorcall-abi-checks.rs
compiletest: rename add-core-stubs to add-minicore
2025-11-02 16:20:06 +01:00
vectorcall-abi-checks.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
x86stdcall2.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
x86stdcall.rs
[GCC backend] Ignore failing ui abi tests
2025-09-20 17:58:32 +02:00