diff --git a/crates/spirv-std/src/arch.rs b/crates/spirv-std/src/arch.rs
index 2d9ccdfded..95e7d908d8 100644
--- a/crates/spirv-std/src/arch.rs
+++ b/crates/spirv-std/src/arch.rs
@@ -147,11 +147,6 @@ pub fn kill() -> ! {
 ///
 /// See:
 /// <https://htmlpreview.github.io/?https://github.com/KhronosGroup/SPIRV-Registry/blob/master/extensions/KHR/SPV_KHR_shader_clock.html>
-#[cfg(all(
-    target_feature = "Int64",
-    target_feature = "ShaderClockKHR",
-    target_feature = "ext:SPV_KHR_shader_clock"
-))]
 #[spirv_std_macros::gpu_only]
 #[doc(alias = "OpReadClockKHR")]
 pub unsafe fn read_clock_khr<const SCOPE: u32>() -> u64 {
@@ -172,10 +167,6 @@ pub unsafe fn read_clock_khr<const SCOPE: u32>() -> u64 {
 /// capability. It returns a 'vector of two-components of 32-bit unsigned
 /// integer type with the first component containing the 32 least significant
 /// bits and the second component containing the 32 most significant bits.'
-#[cfg(all(
-    target_feature = "ShaderClockKHR",
-    target_feature = "ext:SPV_KHR_shader_clock"
-))]
 #[spirv_std_macros::gpu_only]
 #[doc(alias = "OpReadClockKHR")]
 pub unsafe fn read_clock_uvec2_khr<V: Vector<u32, 2>, const SCOPE: u32>() -> V {
diff --git a/tests/compiletests/src/main.rs b/tests/compiletests/src/main.rs
index ffb42b0577..64ca1c7e70 100644
--- a/tests/compiletests/src/main.rs
+++ b/tests/compiletests/src/main.rs
@@ -151,6 +151,8 @@ impl Runner {
                 format!("{}-{}", env, variation.name)
             };
 
+            println!("Testing env: {}\n", stage_id);
+
             let target = format!("{SPIRV_TARGET_PREFIX}{env}");
             let libs = build_deps(&self.deps_target_dir, &self.codegen_backend_path, &target);
             let mut flags = test_rustc_flags(&self.codegen_backend_path, &libs, &[
@@ -342,15 +344,7 @@ struct TestDeps {
 /// The RUSTFLAGS passed to all SPIR-V builds.
 // FIXME(eddyb) expose most of these from `spirv-builder`.
 fn rust_flags(codegen_backend_path: &Path) -> String {
-    let target_features = [
-        "Int8",
-        "Int16",
-        "Int64",
-        "Float64",
-        // Only needed for `ui/arch/read_clock_khr.rs`.
-        "ShaderClockKHR",
-        "ext:SPV_KHR_shader_clock",
-    ];
+    let target_features = ["Int8", "Int16", "Int64", "Float64"];
 
     [
         &*format!("-Zcodegen-backend={}", codegen_backend_path.display()),
diff --git a/tests/compiletests/ui/dis/asm_op_decorate.stderr b/tests/compiletests/ui/dis/asm_op_decorate.stderr
index 79a494bbb1..ceadec8d1d 100644
--- a/tests/compiletests/ui/dis/asm_op_decorate.stderr
+++ b/tests/compiletests/ui/dis/asm_op_decorate.stderr
@@ -1,8 +1,6 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
 OpCapability RuntimeDescriptorArray
 OpExtension "SPV_EXT_descriptor_indexing"
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main"
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/const-float-cast-optimized.stderr b/tests/compiletests/ui/dis/const-float-cast-optimized.stderr
index cc72d04ed9..9bec81727d 100644
--- a/tests/compiletests/ui/dis/const-float-cast-optimized.stderr
+++ b/tests/compiletests/ui/dis/const-float-cast-optimized.stderr
@@ -1,7 +1,5 @@
 OpCapability Shader
 OpCapability Float64
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main" %2
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/const-float-cast.stderr b/tests/compiletests/ui/dis/const-float-cast.stderr
index 53d922f512..506b262c37 100644
--- a/tests/compiletests/ui/dis/const-float-cast.stderr
+++ b/tests/compiletests/ui/dis/const-float-cast.stderr
@@ -1,7 +1,5 @@
 OpCapability Shader
 OpCapability Float64
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main" %2
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/const-from-cast.stderr b/tests/compiletests/ui/dis/const-from-cast.stderr
index 648e00c51a..317670de05 100644
--- a/tests/compiletests/ui/dis/const-from-cast.stderr
+++ b/tests/compiletests/ui/dis/const-from-cast.stderr
@@ -1,6 +1,4 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main" %2
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/const-int-cast.stderr b/tests/compiletests/ui/dis/const-int-cast.stderr
index c860b65583..c632df542d 100644
--- a/tests/compiletests/ui/dis/const-int-cast.stderr
+++ b/tests/compiletests/ui/dis/const-int-cast.stderr
@@ -1,6 +1,4 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main" %2
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/const-narrowing-cast.stderr b/tests/compiletests/ui/dis/const-narrowing-cast.stderr
index 60a1ffb399..853d23f0d8 100644
--- a/tests/compiletests/ui/dis/const-narrowing-cast.stderr
+++ b/tests/compiletests/ui/dis/const-narrowing-cast.stderr
@@ -1,7 +1,5 @@
 OpCapability Shader
 OpCapability Int8
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main" %2
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/custom_entry_point.stderr b/tests/compiletests/ui/dis/custom_entry_point.stderr
index d00d71e8bb..240b113e8a 100644
--- a/tests/compiletests/ui/dis/custom_entry_point.stderr
+++ b/tests/compiletests/ui/dis/custom_entry_point.stderr
@@ -1,6 +1,4 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "hello_world"
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/generic-fn-op-name.stderr b/tests/compiletests/ui/dis/generic-fn-op-name.stderr
index 048f1e2f34..eedbde5b98 100644
--- a/tests/compiletests/ui/dis/generic-fn-op-name.stderr
+++ b/tests/compiletests/ui/dis/generic-fn-op-name.stderr
@@ -1,6 +1,4 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main"
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/issue-723-output.stderr b/tests/compiletests/ui/dis/issue-723-output.stderr
index 9adcd37970..33e4f029a7 100644
--- a/tests/compiletests/ui/dis/issue-723-output.stderr
+++ b/tests/compiletests/ui/dis/issue-723-output.stderr
@@ -1,6 +1,4 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main" %2
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/non-writable-storage_buffer.stderr b/tests/compiletests/ui/dis/non-writable-storage_buffer.stderr
index 14349d6707..124a31c65b 100644
--- a/tests/compiletests/ui/dis/non-writable-storage_buffer.stderr
+++ b/tests/compiletests/ui/dis/non-writable-storage_buffer.stderr
@@ -1,6 +1,4 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main"
 OpExecutionMode %1 OriginUpperLeft
diff --git a/tests/compiletests/ui/dis/panic_builtin_bounds_check.stderr b/tests/compiletests/ui/dis/panic_builtin_bounds_check.stderr
index 342fe4755f..d2066bab76 100644
--- a/tests/compiletests/ui/dis/panic_builtin_bounds_check.stderr
+++ b/tests/compiletests/ui/dis/panic_builtin_bounds_check.stderr
@@ -1,7 +1,5 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
 OpExtension "SPV_KHR_non_semantic_info"
-OpExtension "SPV_KHR_shader_clock"
 %1 = OpExtInstImport "NonSemantic.DebugPrintf"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %2 "main"
diff --git a/tests/compiletests/ui/dis/panic_sequential_many.stderr b/tests/compiletests/ui/dis/panic_sequential_many.stderr
index 3e0546a139..5c86eaab48 100644
--- a/tests/compiletests/ui/dis/panic_sequential_many.stderr
+++ b/tests/compiletests/ui/dis/panic_sequential_many.stderr
@@ -1,7 +1,5 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
 OpExtension "SPV_KHR_non_semantic_info"
-OpExtension "SPV_KHR_shader_clock"
 %1 = OpExtInstImport "NonSemantic.DebugPrintf"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %2 "main" %3 %4 %5
diff --git a/tests/compiletests/ui/dis/spec_constant-attr.rs b/tests/compiletests/ui/dis/spec_constant-attr.rs
index ce04ba674b..88af104fe8 100644
--- a/tests/compiletests/ui/dis/spec_constant-attr.rs
+++ b/tests/compiletests/ui/dis/spec_constant-attr.rs
@@ -9,11 +9,6 @@
 // normalize-stderr-test "OpExtension .SPV_KHR_vulkan_memory_model.\n" -> ""
 // normalize-stderr-test "OpMemoryModel Logical Vulkan" -> "OpMemoryModel Logical Simple"
 
-// FIXME(eddyb) this should use revisions to track both the `vulkan1.2` output
-// and the pre-`vulkan1.2` output, but per-revisions `{only,ignore}-*` directives
-// are not supported in `compiletest-rs`.
-// ignore-vulkan1.2
-
 use spirv_std::spirv;
 
 #[spirv(fragment)]
diff --git a/tests/compiletests/ui/dis/spec_constant-attr.stderr b/tests/compiletests/ui/dis/spec_constant-attr.stderr
index 4b26a5c08b..8282737450 100644
--- a/tests/compiletests/ui/dis/spec_constant-attr.stderr
+++ b/tests/compiletests/ui/dis/spec_constant-attr.stderr
@@ -1,6 +1,4 @@
 OpCapability Shader
-OpCapability ShaderClockKHR
-OpExtension "SPV_KHR_shader_clock"
 OpMemoryModel Logical Simple
 OpEntryPoint Fragment %1 "main" %2
 OpExecutionMode %1 OriginUpperLeft