[llvm] 344eaf7 - [Test] Update test with check script, add two more motivating cases

[Max Kazantsev via llvm-commits]

Author: Max Kazantsev
Date: 2020-06-15T12:41:46+07:00
New Revision: 344eaf782731b3553a671b976f8e130194f28c34

URL: https://github.com/llvm/llvm-project/commit/344eaf782731b3553a671b976f8e130194f28c34
DIFF: https://github.com/llvm/llvm-project/commit/344eaf782731b3553a671b976f8e130194f28c34.diff

LOG: [Test] Update test with check script, add two more motivating cases

Added: 
    

Modified: 
    llvm/test/Transforms/InstCombine/branch.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/InstCombine/branch.ll b/llvm/test/Transforms/InstCombine/branch.ll
index 2168c9fd9a13..4e271725d53a 100644
--- a/llvm/test/Transforms/InstCombine/branch.ll
+++ b/llvm/test/Transforms/InstCombine/branch.ll
@@ -1,27 +1,121 @@
-; Check that we fold the condition of branches of the
-; form: br <condition> dest1, dest2, where dest1 == dest2.
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -instcombine -S < %s | FileCheck %s
+; RUN: opt -passes=instcombine -S < %s | FileCheck %s
 
+; Check that we fold the condition of branches of the
+; form: br <condition> dest1, dest2, where dest1 == dest2.
 define i32 @test(i32 %x) {
-; CHECK-LABEL: @test
+; CHECK-LABEL: @test(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 false, label [[MERGE:%.*]], label [[MERGE]]
+; CHECK:       merge:
+; CHECK-NEXT:    ret i32 [[X:%.*]]
+;
 entry:
-; CHECK-NOT: icmp
-; CHECK: br i1 false
   %cmp = icmp ult i32 %x, 7
   br i1 %cmp, label %merge, label %merge
 merge:
-; CHECK-LABEL: merge:
-; CHECK: ret i32 %x
   ret i32 %x
 }
 
 @global = global i8 0
 
 define i32 @pat(i32 %x) {
-; CHECK-NOT: icmp false
-; CHECK: br i1 false
+; CHECK-LABEL: @pat(
+; CHECK-NEXT:    br i1 false, label [[PATATINO:%.*]], label [[PATATINO]]
+; CHECK:       patatino:
+; CHECK-NEXT:    ret i32 [[X:%.*]]
+;
   %y = icmp eq i32 27, ptrtoint(i8* @global to i32)
   br i1 %y, label %patatino, label %patatino
 patatino:
   ret i32 %x
 }
+
+; TODO: Simplify this to "ret cond".
+define i1 @test01(i1 %cond) {
+; CHECK-LABEL: @test01(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE_1:%.*]], label [[IF_FALSE_1:%.*]]
+; CHECK:       if.true.1:
+; CHECK-NEXT:    br label [[MERGE_1:%.*]]
+; CHECK:       if.false.1:
+; CHECK-NEXT:    br label [[MERGE_1]]
+; CHECK:       merge.1:
+; CHECK-NEXT:    [[MERGE_COND_1:%.*]] = phi i1 [ true, [[IF_TRUE_1]] ], [ false, [[IF_FALSE_1]] ]
+; CHECK-NEXT:    br i1 [[MERGE_COND_1]], label [[IF_TRUE_2:%.*]], label [[IF_FALSE_2:%.*]]
+; CHECK:       if.true.2:
+; CHECK-NEXT:    br label [[MERGE_2:%.*]]
+; CHECK:       if.false.2:
+; CHECK-NEXT:    br label [[MERGE_2]]
+; CHECK:       merge.2:
+; CHECK-NEXT:    [[MERGE_COND_2:%.*]] = phi i1 [ true, [[IF_TRUE_2]] ], [ false, [[IF_FALSE_2]] ]
+; CHECK-NEXT:    ret i1 [[MERGE_COND_2]]
+;
+entry:
+  br i1 %cond, label %if.true.1, label %if.false.1
+
+if.true.1:
+  br label %merge.1
+
+if.false.1:
+  br label  %merge.1
+
+merge.1:
+  %merge.cond.1 = phi i1 [true, %if.true.1], [false, %if.false.1]
+  br i1 %merge.cond.1, label %if.true.2, label %if.false.2
+
+if.true.2:
+  br label %merge.2
+
+if.false.2:
+  br label  %merge.2
+
+merge.2:
+  %merge.cond.2 = phi i1 [true, %if.true.2], [false, %if.false.2]
+  ret i1 %merge.cond.2
+}
+
+; TODO: Simplify this to "ret %cond".
+define i1 @test02(i1 %cond) {
+; CHECK-LABEL: @test02(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_TRUE_1:%.*]], label [[IF_FALSE_1:%.*]]
+; CHECK:       if.true.1:
+; CHECK-NEXT:    br label [[MERGE_1:%.*]]
+; CHECK:       if.false.1:
+; CHECK-NEXT:    br label [[MERGE_1]]
+; CHECK:       merge.1:
+; CHECK-NEXT:    [[MERGE_COND_1:%.*]] = phi i1 [ false, [[IF_TRUE_1]] ], [ true, [[IF_FALSE_1]] ]
+; CHECK-NEXT:    br i1 [[MERGE_COND_1]], label [[IF_TRUE_2:%.*]], label [[IF_FALSE_2:%.*]]
+; CHECK:       if.true.2:
+; CHECK-NEXT:    br label [[MERGE_2:%.*]]
+; CHECK:       if.false.2:
+; CHECK-NEXT:    br label [[MERGE_2]]
+; CHECK:       merge.2:
+; CHECK-NEXT:    [[MERGE_COND_2:%.*]] = phi i1 [ false, [[IF_TRUE_2]] ], [ true, [[IF_FALSE_2]] ]
+; CHECK-NEXT:    ret i1 [[MERGE_COND_2]]
+;
+entry:
+  br i1 %cond, label %if.true.1, label %if.false.1
+
+if.true.1:
+  br label %merge.1
+
+if.false.1:
+  br label  %merge.1
+
+merge.1:
+  %merge.cond.1 = phi i1 [false, %if.true.1], [true, %if.false.1]
+  br i1 %merge.cond.1, label %if.true.2, label %if.false.2
+
+if.true.2:
+  br label %merge.2
+
+if.false.2:
+  br label  %merge.2
+
+merge.2:
+  %merge.cond.2 = phi i1 [false, %if.true.2], [true, %if.false.2]
+  ret i1 %merge.cond.2
+}