llvm 20: adapt integer comparison tests

The LLVM commit llvm/llvm-project@abf69a1
changed the IR in a few comparison tests:
https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/30500#01917017-26fe-4a4d-956b-725a2903e5a8

Adapted accordingly.

Author: krasimirgg

tests/codegen/comparison-operators-2-tuple.rs

@@ -1,5 +1,8 @@
 //@ compile-flags: -C opt-level=1 -Z merge-functions=disabled
 //@ only-x86_64
+//@ revisions: llvm-pre-20 llvm-20
+//@[llvm-20]min-llvm-version: 20
+//@[llvm-pre-20]ignore-llvm-version: 20 - 99
 
 #![crate_type = "lib"]
 
@@ -77,11 +80,17 @@ pub fn check_ge_direct(a: TwoTuple, b: TwoTuple) -> bool {
 // CHECK-SAME: (i16 noundef %[[A0:.+]], i16 noundef %[[A1:.+]], i16 noundef %[[B0:.+]], i16 noundef %[[B1:.+]])
 #[no_mangle]
 pub fn check_lt_via_cmp(a: TwoTuple, b: TwoTuple) -> bool {
-    // CHECK-DAG: %[[EQ:.+]] = icmp eq i16 %[[A0]], %[[B0]]
-    // CHECK-DAG: %[[CMP0:.+]] = icmp slt i16 %[[A0]], %[[B0]]
-    // CHECK-DAG: %[[CMP1:.+]] = icmp ult i16 %[[A1]], %[[B1]]
-    // CHECK: %[[R:.+]] = select i1 %[[EQ]], i1 %[[CMP1]], i1 %[[CMP0]]
-    // CHECK: ret i1 %[[R]]
+    // llvm-20-DAG: %[[CMP0:.+]] = tail call noundef range(i8 -1, 2) i8 @llvm.scmp.i8.i16(i16 %[[A0]], i16 %[[B0]])
+    // llvm-20-DAG: %[[EQ:.+]] = icmp eq i16 %[[A0]], %[[B0]]
+    // llvm-20-DAG: %[[CMP1:.+]] = tail call range(i8 -1, 2) i8 @llvm.ucmp.i8.i16(i16 %[[A1]], i16 %[[B1]])
+    // llvm-20: %[[S:.+]] = select i1 %[[EQ]], i8 %[[CMP1]], i8 %[[CMP0]]
+    // llvm-20: %[[R:.+]] = icmp eq i8 %[[S]], -1
+    // llvm-20: ret i1 %[[R]]
+    // llvm-pre-20-DAG: icmp eq i16 %[[A0]], %[[B0]]
+    // llvm-pre-20-DAG: %[[CMP0:.+]] = icmp slt i16 %[[A0]], %[[B0]]
+    // llvm-pre-20-DAG: %[[CMP1:.+]] = icmp ult i16 %[[A1]], %[[B1]]
+    // llvm-pre-20: %[[R:.+]] = select i1 %[[EQ]], i1 %[[CMP1]], i1 %[[CMP0]]
+    // llvm-pre-20: ret i1 %[[R]]
     Ord::cmp(&a, &b).is_lt()
 }
 

tests/codegen/integer-cmp.rs

@@ -1,6 +1,9 @@
 // This is test for more optimal Ord implementation for integers.
 // See <https://github.com/rust-lang/rust/issues/63758> for more info.
 
+//@ revisions: llvm-pre-20 llvm-20
+//@[llvm-20]min-llvm-version: 20
+//@[llvm-pre-20]ignore-llvm-version: 20 - 99
 //@ compile-flags: -C opt-level=3
 
 #![crate_type = "lib"]
@@ -10,19 +13,21 @@ use std::cmp::Ordering;
 // CHECK-LABEL: @cmp_signed
 #[no_mangle]
 pub fn cmp_signed(a: i64, b: i64) -> Ordering {
-    // CHECK: icmp slt
-    // CHECK: icmp ne
-    // CHECK: zext i1
-    // CHECK: select i1
+    // llvm-20: @llvm.scmp.i8.i64
+    // llvm-pre-20: icmp slt
+    // llvm-pre-20: icmp ne
+    // llvm-pre-20: zext i1
+    // llvm-pre-20: select i1
     a.cmp(&b)
 }
 
 // CHECK-LABEL: @cmp_unsigned
 #[no_mangle]
 pub fn cmp_unsigned(a: u32, b: u32) -> Ordering {
-    // CHECK: icmp ult
-    // CHECK: icmp ne
-    // CHECK: zext i1
-    // CHECK: select i1
+    // llvm-20: @llvm.ucmp.i8.i32
+    // llvm-pre-20: icmp ult
+    // llvm-pre-20: icmp ne
+    // llvm-pre-20: zext i1
+    // llvm-pre-20: select i1
     a.cmp(&b)
 }