diff --git a/tests/codegen/abi-main-signature-16bit-c-int.rs b/tests/codegen/abi-main-signature-16bit-c-int.rs
index 353e7489b55..ce4d35dea0c 100644
--- a/tests/codegen/abi-main-signature-16bit-c-int.rs
+++ b/tests/codegen/abi-main-signature-16bit-c-int.rs
@@ -2,22 +2,10 @@
 // entry point. It must match C's `int main(int, char **)`.
 
 // This test is for targets with 16bit c_int only.
-// ignore-aarch64
-// ignore-arm
-// ignore-asmjs
-// ignore-hexagon
-// ignore-mips
-// ignore-mips64
-// ignore-powerpc
-// ignore-powerpc64
-// ignore-riscv64
-// ignore-s390x
-// ignore-sparc
-// ignore-sparc64
-// ignore-wasm32
-// ignore-x86
-// ignore-x86_64
-// ignore-loongarch64
+// revisions: avr msp
+//[avr] only-avr
+//[msp] only-msp430
+
 
 fn main() {
 }
diff --git a/tests/codegen/global_asm.rs b/tests/codegen/global_asm.rs
index 41a99530ad2..4c2ccf4e0e9 100644
--- a/tests/codegen/global_asm.rs
+++ b/tests/codegen/global_asm.rs
@@ -1,24 +1,6 @@
-// ignore-aarch64
-// ignore-arm
-// ignore-avr
-// ignore-bpf
-// ignore-bpf
-// ignore-hexagon
-// ignore-mips
-// ignore-mips64
-// ignore-msp430
-// ignore-powerpc64
-// ignore-powerpc
-// ignore-sparc
-// ignore-sparc64
-// ignore-s390x
-// ignore-thumb
-// ignore-nvptx64
-// ignore-spirv
-// ignore-wasm32
-// ignore-wasm64
-// ignore-emscripten
-// ignore-loongarch64
+// revisions: x32 x64
+//[x32] only-x86
+//[x64] only-x86_64
 // compile-flags: -C no-prepopulate-passes
 
 #![crate_type = "lib"]
diff --git a/tests/codegen/global_asm_include.rs b/tests/codegen/global_asm_include.rs
index e25c164f407..0fede8c71e4 100644
--- a/tests/codegen/global_asm_include.rs
+++ b/tests/codegen/global_asm_include.rs
@@ -1,24 +1,6 @@
-// ignore-aarch64
-// ignore-arm
-// ignore-avr
-// ignore-bpf
-// ignore-bpf
-// ignore-hexagon
-// ignore-mips
-// ignore-mips64
-// ignore-msp430
-// ignore-powerpc64
-// ignore-powerpc
-// ignore-sparc
-// ignore-sparc64
-// ignore-s390x
-// ignore-thumb
-// ignore-nvptx64
-// ignore-spirv
-// ignore-wasm32
-// ignore-wasm64
-// ignore-emscripten
-// ignore-loongarch64
+// revisions: x32 x64
+//[x32] only-x86
+//[x64] only-x86_64
 // compile-flags: -C no-prepopulate-passes
 
 #![crate_type = "lib"]
diff --git a/tests/codegen/global_asm_x2.rs b/tests/codegen/global_asm_x2.rs
index 71ecef124f1..1fc2825b2bd 100644
--- a/tests/codegen/global_asm_x2.rs
+++ b/tests/codegen/global_asm_x2.rs
@@ -1,24 +1,6 @@
-// ignore-aarch64
-// ignore-arm
-// ignore-avr
-// ignore-bpf
-// ignore-bpf
-// ignore-hexagon
-// ignore-mips
-// ignore-mips64
-// ignore-msp430
-// ignore-powerpc64
-// ignore-powerpc
-// ignore-sparc
-// ignore-sparc64
-// ignore-s390x
-// ignore-thumb
-// ignore-nvptx64
-// ignore-spirv
-// ignore-wasm32
-// ignore-wasm64
-// ignore-emscripten
-// ignore-loongarch64
+// revisions: x32 x64
+//[x32] only-x86
+//[x64] only-x86_64
 // compile-flags: -C no-prepopulate-passes
 
 #![crate_type = "lib"]
diff --git a/tests/codegen/repr/transparent-imm-array.rs b/tests/codegen/repr/transparent-imm-array.rs
index 33f4f222b0a..6d712778509 100644
--- a/tests/codegen/repr/transparent-imm-array.rs
+++ b/tests/codegen/repr/transparent-imm-array.rs
@@ -1,19 +1,15 @@
+// revisions: arm mips thumb wasm32
 // compile-flags: -C no-prepopulate-passes
 //
-
-// ignore-aarch64
+//[arm] only-arm
+//[mips] only-mips
+//[thumb] only-thumb
+//[wasm32] only-wasm32
 // ignore-emscripten
-// ignore-mips64
-// ignore-powerpc
-// ignore-powerpc64
-// ignore-riscv64 see codegen/riscv-abi
-// ignore-s390x
-// ignore-sparc
-// ignore-sparc64
-// ignore-x86
-// ignore-x86_64
-// ignore-loongarch64
-// See repr-transparent.rs
+// See ./transparent.rs
+// Some platforms pass large aggregates using immediate arrays in LLVMIR
+// Other platforms pass large aggregates using struct pointer in LLVMIR
+// This covers the "immediate array" case.
 
 #![feature(transparent_unions)]
 
diff --git a/tests/codegen/repr/transparent-mips64.rs b/tests/codegen/repr/transparent-mips64.rs
index 0db17e6b13a..245daf13e28 100644
--- a/tests/codegen/repr/transparent-mips64.rs
+++ b/tests/codegen/repr/transparent-mips64.rs
@@ -2,7 +2,7 @@
 //
 
 // only-mips64
-// See repr-transparent.rs
+// See ./transparent.rs
 
 #![feature(transparent_unions)]
 
diff --git a/tests/codegen/repr/transparent-struct-ptr.rs b/tests/codegen/repr/transparent-struct-ptr.rs
index c783a75a400..d2120f7ec14 100644
--- a/tests/codegen/repr/transparent-struct-ptr.rs
+++ b/tests/codegen/repr/transparent-struct-ptr.rs
@@ -1,18 +1,16 @@
+// revisions: x32 x64 sparc sparc64
 // compile-flags: -O -C no-prepopulate-passes
 //
-
-// ignore-arm
-// ignore-aarch64
-// ignore-mips
-// ignore-mips64
-// ignore-powerpc
-// ignore-powerpc64
-// ignore-riscv64 see codegen/riscv-abi
-// ignore-s390x
+//[x32] only-x86
+//[x64] only-x86_64
+//[sparc] only-sparc
+//[sparc64] only-sparc64
 // ignore-windows
-// ignore-loongarch64
-// ignore-wasm32-bare
-// See repr-transparent.rs
+// See ./transparent.rs
+// Some platforms pass large aggregates using immediate arrays in LLVMIR
+// Other platforms pass large aggregates using struct pointer in LLVMIR
+// This covers the "struct pointer" case.
+
 
 #![feature(transparent_unions)]
 
diff --git a/tests/codegen/repr/transparent.rs b/tests/codegen/repr/transparent.rs
index 64f3ce5a43c..b140fc719da 100644
--- a/tests/codegen/repr/transparent.rs
+++ b/tests/codegen/repr/transparent.rs
@@ -1,10 +1,13 @@
 // compile-flags: -O -C no-prepopulate-passes
-
 // ignore-riscv64 riscv64 has an i128 type used with test_Vector
-// see codegen/riscv-abi for riscv functiona call tests
 // ignore-s390x s390x with default march passes vector types per reference
 // ignore-loongarch64 see codegen/loongarch-abi for loongarch function call tests
 
+// This codegen test embeds assumptions about how certain "C" psABIs are handled
+// so it doesn't apply to all architectures or even all OS
+// For RISCV: see codegen/riscv-abi
+// For LoongArch: see codegen/loongarch-abi
+
 #![crate_type="lib"]
 #![feature(repr_simd, transparent_unions)]
 
@@ -159,7 +162,7 @@ pub union UnionF32WithZsts {
 pub extern "C" fn test_UnionF32WithZsts(_: UnionF32WithZsts) -> UnionF32WithZsts { loop {} }
 
 
-// All that remains to be tested are aggregates. They are tested in separate files called repr-
+// All that remains to be tested are aggregates. They are tested in separate files called
 // transparent-*.rs  with `only-*` or `ignore-*` directives, because the expected LLVM IR
 // function signatures vary so much that it's not reasonably possible to cover all of them with a
 // single CHECK line.
diff --git a/tests/debuginfo/thread-names.rs b/tests/debuginfo/thread-names.rs
index 7a35a518946..2c5b3f272e0 100644
--- a/tests/debuginfo/thread-names.rs
+++ b/tests/debuginfo/thread-names.rs
@@ -1,15 +1,8 @@
 // compile-flags:-g
+// revisions: macos windows
 // We can't set the main thread name on Linux because it renames the process (#97191)
-// ignore-linux
-// ignore-android
-// ignore-dragonfly
-// ignore-emscripten
-// ignore-freebsd
-// ignore-haiku
-// ignore-ios
-// ignore-netbsd
-// ignore-openbsd
-// ignore-solaris
+//[macos] only-macos
+//[windows] only-windows
 // ignore-sgx
 // ignore-windows-gnu
 
diff --git a/tests/ui/abi/stack-probes-lto.rs b/tests/ui/abi/stack-probes-lto.rs
index 0dccb633df9..7282d09706c 100644
--- a/tests/ui/abi/stack-probes-lto.rs
+++ b/tests/ui/abi/stack-probes-lto.rs
@@ -1,13 +1,7 @@
+// revisions: x32 x64
 // run-pass
-// ignore-arm
-// ignore-aarch64
-// ignore-mips
-// ignore-mips64
-// ignore-sparc
-// ignore-sparc64
-// ignore-loongarch64
-// ignore-wasm
-// ignore-emscripten no processes
+//[x32] only-x86
+//[x64] only-x86_64
 // ignore-sgx no processes
 // ignore-musl FIXME #31506
 // ignore-fuchsia no exception handler registered for segfault
diff --git a/tests/ui/abi/stack-probes.rs b/tests/ui/abi/stack-probes.rs
index 8137c92304d..4b8a79a4b68 100644
--- a/tests/ui/abi/stack-probes.rs
+++ b/tests/ui/abi/stack-probes.rs
@@ -1,12 +1,7 @@
+// revisions: x32 x64
 // run-pass
-// ignore-arm
-// ignore-aarch64
-// ignore-mips
-// ignore-mips64
-// ignore-sparc
-// ignore-sparc64
-// ignore-loongarch64
-// ignore-wasm
+//[x32] only-x86
+//[x64] only-x86_64
 // ignore-emscripten no processes
 // ignore-sgx no processes
 // ignore-fuchsia no exception handler registered for segfault
diff --git a/tests/ui/target-feature/gate.rs b/tests/ui/target-feature/gate.rs
index 8d1765eb8e9..3ebd2dbceaa 100644
--- a/tests/ui/target-feature/gate.rs
+++ b/tests/ui/target-feature/gate.rs
@@ -1,16 +1,5 @@
-// ignore-arm
-// ignore-aarch64
-// ignore-wasm
-// ignore-emscripten
-// ignore-mips
-// ignore-mips64
-// ignore-powerpc
-// ignore-powerpc64
-// ignore-riscv64
-// ignore-sparc
-// ignore-sparc64
-// ignore-s390x
-// ignore-loongarch64
+// only-x86_64
+//
 // gate-test-sse4a_target_feature
 // gate-test-powerpc_target_feature
 // gate-test-avx512_target_feature
diff --git a/tests/ui/target-feature/gate.stderr b/tests/ui/target-feature/gate.stderr
index ee542b60a26..896212e42fc 100644
--- a/tests/ui/target-feature/gate.stderr
+++ b/tests/ui/target-feature/gate.stderr
@@ -1,5 +1,5 @@
 error[E0658]: the target feature `avx512bw` is currently unstable
-  --> $DIR/gate.rs:32:18
+  --> $DIR/gate.rs:21:18
    |
 LL | #[target_feature(enable = "avx512bw")]
    |                  ^^^^^^^^^^^^^^^^^^^
diff --git a/tests/ui/target-feature/invalid-attribute.rs b/tests/ui/target-feature/invalid-attribute.rs
index 77fd8b85f3f..d1b3cf71c15 100644
--- a/tests/ui/target-feature/invalid-attribute.rs
+++ b/tests/ui/target-feature/invalid-attribute.rs
@@ -1,16 +1,4 @@
-// ignore-arm
-// ignore-aarch64
-// ignore-wasm
-// ignore-emscripten
-// ignore-mips
-// ignore-mips64
-// ignore-powerpc
-// ignore-powerpc64
-// ignore-riscv64
-// ignore-s390x
-// ignore-sparc
-// ignore-sparc64
-// ignore-loongarch64
+// only-x86_64
 
 #![warn(unused_attributes)]
 
diff --git a/tests/ui/target-feature/invalid-attribute.stderr b/tests/ui/target-feature/invalid-attribute.stderr
index 6d37d0917bc..29c73921c53 100644
--- a/tests/ui/target-feature/invalid-attribute.stderr
+++ b/tests/ui/target-feature/invalid-attribute.stderr
@@ -1,11 +1,11 @@
 error: malformed `target_feature` attribute input
-  --> $DIR/invalid-attribute.rs:32:1
+  --> $DIR/invalid-attribute.rs:20:1
    |
 LL | #[target_feature = "+sse2"]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[target_feature(enable = "name")]`
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:17:1
+  --> $DIR/invalid-attribute.rs:5:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -14,7 +14,7 @@ LL | extern crate alloc;
    | ------------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:22:1
+  --> $DIR/invalid-attribute.rs:10:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -23,7 +23,7 @@ LL | use alloc::alloc::alloc;
    | ------------------------ not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:27:1
+  --> $DIR/invalid-attribute.rs:15:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -32,7 +32,7 @@ LL | extern "Rust" {}
    | ---------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:49:1
+  --> $DIR/invalid-attribute.rs:37:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -41,7 +41,7 @@ LL | mod another {}
    | -------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:54:1
+  --> $DIR/invalid-attribute.rs:42:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -50,7 +50,7 @@ LL | const FOO: usize = 7;
    | --------------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:59:1
+  --> $DIR/invalid-attribute.rs:47:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -59,7 +59,7 @@ LL | struct Foo;
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:64:1
+  --> $DIR/invalid-attribute.rs:52:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -68,7 +68,7 @@ LL | enum Bar {}
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:69:1
+  --> $DIR/invalid-attribute.rs:57:1
    |
 LL |   #[target_feature(enable = "sse2")]
    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -81,7 +81,7 @@ LL | | }
    | |_- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:77:1
+  --> $DIR/invalid-attribute.rs:65:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -90,7 +90,7 @@ LL | type Uwu = ();
    | -------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:82:1
+  --> $DIR/invalid-attribute.rs:70:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -99,7 +99,7 @@ LL | trait Baz {}
    | ------------ not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:92:1
+  --> $DIR/invalid-attribute.rs:80:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -108,7 +108,7 @@ LL | static A: () = ();
    | ------------------ not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:97:1
+  --> $DIR/invalid-attribute.rs:85:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -117,7 +117,7 @@ LL | impl Quux for u8 {}
    | ------------------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:102:1
+  --> $DIR/invalid-attribute.rs:90:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -126,7 +126,7 @@ LL | impl Foo {}
    | ----------- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:120:5
+  --> $DIR/invalid-attribute.rs:108:5
    |
 LL |       #[target_feature(enable = "sse2")]
    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -138,7 +138,7 @@ LL | |     }
    | |_____- not a function definition
 
 error: attribute should be applied to a function definition
-  --> $DIR/invalid-attribute.rs:128:5
+  --> $DIR/invalid-attribute.rs:116:5
    |
 LL |     #[target_feature(enable = "sse2")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -147,25 +147,25 @@ LL |     || {};
    |     ----- not a function definition
 
 error: the feature named `foo` is not valid for this target
-  --> $DIR/invalid-attribute.rs:34:18
+  --> $DIR/invalid-attribute.rs:22:18
    |
 LL | #[target_feature(enable = "foo")]
    |                  ^^^^^^^^^^^^^^ `foo` is not valid for this target
 
 error: malformed `target_feature` attribute input
-  --> $DIR/invalid-attribute.rs:37:18
+  --> $DIR/invalid-attribute.rs:25:18
    |
 LL | #[target_feature(bar)]
    |                  ^^^ help: must be of the form: `enable = ".."`
 
 error: malformed `target_feature` attribute input
-  --> $DIR/invalid-attribute.rs:39:18
+  --> $DIR/invalid-attribute.rs:27:18
    |
 LL | #[target_feature(disable = "baz")]
    |                  ^^^^^^^^^^^^^^^ help: must be of the form: `enable = ".."`
 
 error[E0658]: `#[target_feature(..)]` can only be applied to `unsafe` functions
-  --> $DIR/invalid-attribute.rs:43:1
+  --> $DIR/invalid-attribute.rs:31:1
    |
 LL | #[target_feature(enable = "sse2")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -177,13 +177,13 @@ LL | fn bar() {}
    = help: add `#![feature(target_feature_11)]` to the crate attributes to enable
 
 error: cannot use `#[inline(always)]` with `#[target_feature]`
-  --> $DIR/invalid-attribute.rs:87:1
+  --> $DIR/invalid-attribute.rs:75:1
    |
 LL | #[inline(always)]
    | ^^^^^^^^^^^^^^^^^
 
 error[E0658]: `#[target_feature(..)]` can only be applied to `unsafe` functions
-  --> $DIR/invalid-attribute.rs:112:5
+  --> $DIR/invalid-attribute.rs:100:5
    |
 LL |     #[target_feature(enable = "sse2")]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^