Replace ignore-everything with only-arch

Combining revisions with only-arch allows specifying
that a test only applies to a handful of targets.
This allows removing a large amount of repetition
in the test suite for tests that do not benefit.
The revisions are suboptimal for this for some tests,
so they aren't preferred in those cases.

4 files changed, 26 insertions, 29 deletions

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.