[clang] [AMDGPU] Lower __builtin_amdgcn_read_exec_hi to use amdgcn_ballot (PR #69567)

[Matt Arsenault via cfe-commits]

================
@@ -21,6 +23,28 @@ void test_ballot_wave32_target_attr(global uint* out, int a, 
int b)
   *out = __builtin_amdgcn_ballot_w32(a == b);
 }
 
+// CHECK-LABEL: @test_read_exec(
+// CHECK: call i64 @llvm.amdgcn.ballot.i64(i1 true)
+void test_read_exec(global uint* out) {
+  *out = __builtin_amdgcn_read_exec();
+}
+
+// CHECK: declare i64 @llvm.amdgcn.ballot.i64(i1) 
#[[$NOUNWIND_READONLY:[0-9]+]]
+
+// CHECK-LABEL: @test_read_exec_lo(
+// CHECK: call i32 @llvm.amdgcn.ballot.i32(i1 true)
+void test_read_exec_lo(global uint* out) {
+  *out = __builtin_amdgcn_read_exec_lo();
+}
+
+// CHECK-LABEL: @test_read_exec_hi(
+// CHECK: call i64 @llvm.amdgcn.ballot.i64(i1 true)
----------------
arsenm wrote:

Does this codegen on wave32? Or should this directly emit 0?

https://github.com/llvm/llvm-project/pull/69567
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