[SimplifyCFG] add tests for cross block compare folding; NFC

These are the baseline tests for D54827.
Patch based on code originally written by: @yinyuefengyi (luo xionghu)

Differential Revision: https://reviews.llvm.org/D54994

llvm-svn: 348151

diff --git a/llvm/test/Transforms/SimplifyCFG/branch-fold-three.ll b/llvm/test/Transforms/SimplifyCFG/branch-fold-three.ll
new file mode 100644 (file)
index 0000000..953749b
--- /dev/null
+++ b/llvm/test/Transforms/SimplifyCFG/branch-fold-three.ll
@@ -0,0 +1,259 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -simplifycfg -S | FileCheck %s
+
+; s >= t, s != t, s <= t
+define void @foo1(i32 %s, i32 %t) {
+; CHECK-LABEL: @foo1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sge i32 [[S:%.*]], [[T:%.*]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END6:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    call void @bar1(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[S]], [[T]]
+; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN2:%.*]], label [[IF_END6]]
+; CHECK:       if.then2:
+; CHECK-NEXT:    call void @bar2(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp sle i32 [[S]], [[T]]
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN4:%.*]], label [[IF_END6]]
+; CHECK:       if.then4:
+; CHECK-NEXT:    call void @bar3(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    br label [[IF_END6]]
+; CHECK:       if.end6:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %cmp = icmp sge i32 %s, %t
+  br i1 %cmp, label %if.then, label %if.end6
+
+if.then:
+  call void @bar1(i32 %s, i32 %t)
+  %cmp1 = icmp ne i32 %s, %t
+  br i1 %cmp1, label %if.then2, label %if.end6
+
+if.then2:
+  call void @bar2(i32 %s, i32 %t)
+  %cmp3 = icmp sle i32 %s, %t
+  br i1 %cmp3, label %if.then4, label %if.end6
+
+if.then4:
+  call void @bar3(i32 %s, i32 %t)
+  br label %if.end6
+
+if.end6:
+  ret void
+}
+
+; s != t, s >= t, s <= t
+define void @foo11(i32 %s, i32 %t) {
+; CHECK-LABEL: @foo11(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[S:%.*]], [[T:%.*]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END6:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    call void @bar1(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP1:%.*]] = icmp sge i32 [[S]], [[T]]
+; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN2:%.*]], label [[IF_END6]]
+; CHECK:       if.then2:
+; CHECK-NEXT:    call void @bar2(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp sle i32 [[S]], [[T]]
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN4:%.*]], label [[IF_END6]]
+; CHECK:       if.then4:
+; CHECK-NEXT:    call void @bar3(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    br label [[IF_END6]]
+; CHECK:       if.end6:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %cmp = icmp ne i32 %s, %t
+  br i1 %cmp, label %if.then, label %if.end6
+
+if.then:
+  call void @bar1(i32 %s, i32 %t)
+  %cmp1 = icmp sge i32 %s, %t
+  br i1 %cmp1, label %if.then2, label %if.end6
+
+if.then2:
+  call void @bar2(i32 %s, i32 %t)
+  %cmp3 = icmp sle i32 %s, %t
+  br i1 %cmp3, label %if.then4, label %if.end6
+
+if.then4:
+  call void @bar3(i32 %s, i32 %t)
+  br label %if.end6
+
+if.end6:
+  ret void
+}
+
+; s >= t, t != s, s <= t
+define void @foo2(i32 %s, i32 %t) {
+; CHECK-LABEL: @foo2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sge i32 [[S:%.*]], [[T:%.*]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END6:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    call void @bar1(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[T]], [[S]]
+; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN2:%.*]], label [[IF_END6]]
+; CHECK:       if.then2:
+; CHECK-NEXT:    call void @bar2(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp sle i32 [[S]], [[T]]
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN4:%.*]], label [[IF_END6]]
+; CHECK:       if.then4:
+; CHECK-NEXT:    call void @bar3(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    br label [[IF_END6]]
+; CHECK:       if.end6:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %cmp = icmp sge i32 %s, %t
+  br i1 %cmp, label %if.then, label %if.end6
+
+if.then:
+  call void @bar1(i32 %s, i32 %t)
+  %cmp1 = icmp ne i32 %t, %s
+  br i1 %cmp1, label %if.then2, label %if.end6
+
+if.then2:
+  call void @bar2(i32 %s, i32 %t)
+  %cmp3 = icmp sle i32 %s, %t
+  br i1 %cmp3, label %if.then4, label %if.end6
+
+if.then4:
+  call void @bar3(i32 %s, i32 %t)
+  br label %if.end6
+
+if.end6:
+  ret void
+}
+
+; s != t, t <= s, s <= t
+define void @foo21(i32 %s, i32 %t) {
+; CHECK-LABEL: @foo21(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[S:%.*]], [[T:%.*]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END6:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    call void @bar1(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP1:%.*]] = icmp sle i32 [[T]], [[S]]
+; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN2:%.*]], label [[IF_END6]]
+; CHECK:       if.then2:
+; CHECK-NEXT:    call void @bar2(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp sle i32 [[S]], [[T]]
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN4:%.*]], label [[IF_END6]]
+; CHECK:       if.then4:
+; CHECK-NEXT:    call void @bar3(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    br label [[IF_END6]]
+; CHECK:       if.end6:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %cmp = icmp ne i32 %s, %t
+  br i1 %cmp, label %if.then, label %if.end6
+
+if.then:
+  call void @bar1(i32 %s, i32 %t)
+  %cmp1 = icmp sle i32 %t, %s
+  br i1 %cmp1, label %if.then2, label %if.end6
+
+if.then2:
+  call void @bar2(i32 %s, i32 %t)
+  %cmp3 = icmp sle i32 %s, %t
+  br i1 %cmp3, label %if.then4, label %if.end6
+
+if.then4:
+  call void @bar3(i32 %s, i32 %t)
+  br label %if.end6
+
+if.end6:
+  ret void
+}
+
+; t <= s, t != s, s <= t
+define void @foo3(i32 %s, i32 %t) {
+; CHECK-LABEL: @foo3(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sle i32 [[T:%.*]], [[S:%.*]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END6:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    call void @bar1(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[T]], [[S]]
+; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN2:%.*]], label [[IF_END6]]
+; CHECK:       if.then2:
+; CHECK-NEXT:    call void @bar2(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp sle i32 [[S]], [[T]]
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN4:%.*]], label [[IF_END6]]
+; CHECK:       if.then4:
+; CHECK-NEXT:    call void @bar3(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    br label [[IF_END6]]
+; CHECK:       if.end6:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %cmp = icmp sle i32 %t, %s
+  br i1 %cmp, label %if.then, label %if.end6
+
+if.then:
+  call void @bar1(i32 %s, i32 %t)
+  %cmp1 = icmp ne i32 %t, %s
+  br i1 %cmp1, label %if.then2, label %if.end6
+
+if.then2:
+  call void @bar2(i32 %s, i32 %t)
+  %cmp3 = icmp sle i32 %s, %t
+  br i1 %cmp3, label %if.then4, label %if.end6
+
+if.then4:
+  call void @bar3(i32 %s, i32 %t)
+  br label %if.end6
+
+if.end6:
+  ret void
+}
+
+; t != s, t <= s, s <= t
+define void @foo31(i32 %s, i32 %t) {
+; CHECK-LABEL: @foo31(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[T:%.*]], [[S:%.*]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END6:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    call void @bar1(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP1:%.*]] = icmp sle i32 [[T]], [[S]]
+; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN2:%.*]], label [[IF_END6]]
+; CHECK:       if.then2:
+; CHECK-NEXT:    call void @bar2(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp sle i32 [[S]], [[T]]
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN4:%.*]], label [[IF_END6]]
+; CHECK:       if.then4:
+; CHECK-NEXT:    call void @bar3(i32 [[S]], i32 [[T]])
+; CHECK-NEXT:    br label [[IF_END6]]
+; CHECK:       if.end6:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %cmp = icmp ne i32 %t, %s
+  br i1 %cmp, label %if.then, label %if.end6
+
+if.then:
+  call void @bar1(i32 %s, i32 %t)
+  %cmp1 = icmp sle i32 %t, %s
+  br i1 %cmp1, label %if.then2, label %if.end6
+
+if.then2:
+  call void @bar2(i32 %s, i32 %t)
+  %cmp3 = icmp sle i32 %s, %t
+  br i1 %cmp3, label %if.then4, label %if.end6
+
+if.then4:
+  call void @bar3(i32 %s, i32 %t)
+  br label %if.end6
+
+if.end6:
+  ret void
+}
+
+declare void @bar1(i32, i32)
+declare void @bar2(i32, i32)
+declare void @bar3(i32, i32)
+