update_test_checks: recognize %if in RUN line (llvm#108972)

Recognize %if for target-specific cases in RUN line and keep only tool
command with options

Author: ElvinaYakubova

llvm/test/tools/UpdateTestChecks/update_test_checks/Inputs/if_target.ll

@@ -0,0 +1,11 @@
+; Example input for update_test_checks (taken from test/Transforms/SLPVectorizer/extractlements-gathered-first-node.ll)
+; RUN: %if x86-registered-target %{ opt -S --passes=slp-vectorizer -slp-threshold=-99999 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s %}
+; RUN: %if aarch64-registered-target %{ opt -S --passes=slp-vectorizer -slp-threshold=-99999 -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s %}
+
+define void @test() {
+bb:
+  %0 = extractelement <4 x i32> zeroinitializer, i32 0
+  %1 = extractelement <2 x i32> zeroinitializer, i32 0
+  %icmp = icmp ult i32 %0, %1
+  ret void
+}

llvm/test/tools/UpdateTestChecks/update_test_checks/Inputs/if_target.ll.expected

@@ -0,0 +1,19 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; Example input for update_test_checks (taken from test/Transforms/SLPVectorizer/extractlements-gathered-first-node.ll)
+; RUN: %if x86-registered-target %{ opt -S --passes=slp-vectorizer -slp-threshold=-99999 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s %}
+; RUN: %if aarch64-registered-target %{ opt -S --passes=slp-vectorizer -slp-threshold=-99999 -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s %}
+
+define void @test() {
+; CHECK-LABEL: define void @test() {
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    [[TMP0:%.*]] = extractelement <4 x i32> zeroinitializer, i32 0
+; CHECK-NEXT:    [[TMP1:%.*]] = extractelement <2 x i32> zeroinitializer, i32 0
+; CHECK-NEXT:    [[ICMP:%.*]] = icmp ult i32 [[TMP0]], [[TMP1]]
+; CHECK-NEXT:    ret void
+;
+bb:
+  %0 = extractelement <4 x i32> zeroinitializer, i32 0
+  %1 = extractelement <2 x i32> zeroinitializer, i32 0
+  %icmp = icmp ult i32 %0, %1
+  ret void
+}

llvm/test/tools/UpdateTestChecks/update_test_checks/if_target.test

@@ -0,0 +1,6 @@
+## Basic test checking that update_test_checks.py works correctly with %if in RUN line
+# RUN: cp -f %S/Inputs/if_target.ll %t.ll && %update_test_checks %t.ll --version 4
+# RUN: diff -u %t.ll %S/Inputs/if_target.ll.expected
+## Check that running the script again does not change the result:
+# RUN: %update_test_checks %t.ll
+# RUN: diff -u %t.ll %S/Inputs/if_target.ll.expected

llvm/utils/update_test_checks.py

@@ -123,7 +123,13 @@ def main():
                 common.warn("Skipping unparsable RUN line: " + l)
                 continue
 
-            commands = [cmd.strip() for cmd in l.split("|")]
+            cropped_content = l
+            if "%if" in l:
+                match = re.search(r"%{\s*(.*?)\s*%}", l)
+                if match:
+                    cropped_content = match.group(1)
+
+            commands = [cmd.strip() for cmd in cropped_content.split("|")]
             assert len(commands) >= 2
             preprocess_cmd = None
             if len(commands) > 2: