From bdc0bf7ba99ac19224260a9dc4770cd6826c2c6a Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Mon, 23 Oct 2017 17:30:17 +0000
Subject: [PATCH] [PassManager] add test to show the new PM uses
 -latesimplifycfg early; NFC

llvm-svn: 316351
---
 .../PhaseOrdering/simplifycfg-options.ll           | 95 ++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 llvm/test/Transforms/PhaseOrdering/simplifycfg-options.ll

diff --git a/llvm/test/Transforms/PhaseOrdering/simplifycfg-options.ll b/llvm/test/Transforms/PhaseOrdering/simplifycfg-options.ll
new file mode 100644
index 0000000..fd8456d
--- /dev/null
+++ b/llvm/test/Transforms/PhaseOrdering/simplifycfg-options.ll
@@ -0,0 +1,95 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -O1 -S < %s                    | FileCheck %s --check-prefix=OLDPM
+; RUN: opt -passes='default<O1>' -S < %s  | FileCheck %s --check-prefix=NEWPM
+
+; Don't simplify unconditional branches from empty blocks in simplifyCFG
+; until late in the pipeline because it can destroy canonical loop structure.
+
+; FIXME: The new pass manager is not limiting simplifycfg at any point in the pipeline,
+; so it performs a transformation before loop optimizations that is avoided in the old PM.
+
+define i1 @PR33605(i32 %a, i32 %b, i32* %c) {
+; OLDPM-LABEL: @PR33605(
+; OLDPM-NEXT:  for.body:
+; OLDPM-NEXT:    [[OR:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
+; OLDPM-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[C:%.*]], i64 1
+; OLDPM-NEXT:    [[TMP0:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
+; OLDPM-NEXT:    [[CMP:%.*]] = icmp eq i32 [[OR]], [[TMP0]]
+; OLDPM-NEXT:    br i1 [[CMP]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
+; OLDPM:       if.then:
+; OLDPM-NEXT:    store i32 [[OR]], i32* [[ARRAYIDX]], align 4
+; OLDPM-NEXT:    tail call void @foo()
+; OLDPM-NEXT:    br label [[IF_END]]
+; OLDPM:       if.end:
+; OLDPM-NEXT:    [[CHANGED_1_OFF0:%.*]] = phi i1 [ true, [[IF_THEN]] ], [ false, [[FOR_BODY:%.*]] ]
+; OLDPM-NEXT:    [[TMP1:%.*]] = load i32, i32* [[C]], align 4
+; OLDPM-NEXT:    [[CMP_1:%.*]] = icmp eq i32 [[OR]], [[TMP1]]
+; OLDPM-NEXT:    br i1 [[CMP_1]], label [[IF_END_1:%.*]], label [[IF_THEN_1:%.*]]
+; OLDPM:       if.then.1:
+; OLDPM-NEXT:    store i32 [[OR]], i32* [[C]], align 4
+; OLDPM-NEXT:    tail call void @foo()
+; OLDPM-NEXT:    br label [[IF_END_1]]
+; OLDPM:       if.end.1:
+; OLDPM-NEXT:    [[CHANGED_1_OFF0_1:%.*]] = phi i1 [ true, [[IF_THEN_1]] ], [ [[CHANGED_1_OFF0]], [[IF_END]] ]
+; OLDPM-NEXT:    ret i1 [[CHANGED_1_OFF0_1]]
+;
+; NEWPM-LABEL: @PR33605(
+; NEWPM-NEXT:  entry:
+; NEWPM-NEXT:    [[OR:%.*]] = or i32 [[B:%.*]], [[A:%.*]]
+; NEWPM-NEXT:    br label [[FOR_COND_OUTER:%.*]]
+; NEWPM:       for.cond.outer:
+; NEWPM-NEXT:    [[I_0_PH:%.*]] = phi i32 [ [[DEC:%.*]], [[IF_THEN:%.*]] ], [ 2, [[ENTRY:%.*]] ]
+; NEWPM-NEXT:    [[CHANGED_0_OFF0_PH:%.*]] = phi i1 [ true, [[IF_THEN]] ], [ false, [[ENTRY]] ]
+; NEWPM-NEXT:    br label [[FOR_COND:%.*]]
+; NEWPM:       for.cond:
+; NEWPM-NEXT:    [[I_0:%.*]] = phi i32 [ [[DEC]], [[FOR_BODY:%.*]] ], [ [[I_0_PH]], [[FOR_COND_OUTER]] ]
+; NEWPM-NEXT:    [[DEC]] = add nsw i32 [[I_0]], -1
+; NEWPM-NEXT:    [[TOBOOL:%.*]] = icmp eq i32 [[I_0]], 0
+; NEWPM-NEXT:    br i1 [[TOBOOL]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]]
+; NEWPM:       for.cond.cleanup:
+; NEWPM-NEXT:    ret i1 [[CHANGED_0_OFF0_PH]]
+; NEWPM:       for.body:
+; NEWPM-NEXT:    [[IDXPROM:%.*]] = sext i32 [[DEC]] to i64
+; NEWPM-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[C:%.*]], i64 [[IDXPROM]]
+; NEWPM-NEXT:    [[TMP0:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
+; NEWPM-NEXT:    [[CMP:%.*]] = icmp eq i32 [[OR]], [[TMP0]]
+; NEWPM-NEXT:    br i1 [[CMP]], label [[FOR_COND]], label [[IF_THEN]]
+; NEWPM:       if.then:
+; NEWPM-NEXT:    store i32 [[OR]], i32* [[ARRAYIDX]], align 4
+; NEWPM-NEXT:    tail call void @foo()
+; NEWPM-NEXT:    br label [[FOR_COND_OUTER]]
+;
+entry:
+  br label %for.cond
+
+for.cond:
+  %i.0 = phi i32 [ 2, %entry ], [ %dec, %if.end ]
+  %changed.0.off0 = phi i1 [ false, %entry ], [ %changed.1.off0, %if.end ]
+  %dec = add nsw i32 %i.0, -1
+  %tobool = icmp eq i32 %i.0, 0
+  br i1 %tobool, label %for.cond.cleanup, label %for.body
+
+for.cond.cleanup:
+  %changed.0.off0.lcssa = phi i1 [ %changed.0.off0, %for.cond ]
+  ret i1 %changed.0.off0.lcssa
+
+for.body:
+  %or = or i32 %a, %b
+  %idxprom = sext i32 %dec to i64
+  %arrayidx = getelementptr inbounds i32, i32* %c, i64 %idxprom
+  %0 = load i32, i32* %arrayidx, align 4
+  %cmp = icmp eq i32 %or, %0
+  br i1 %cmp, label %if.end, label %if.then
+
+if.then:
+  store i32 %or, i32* %arrayidx, align 4
+  call void @foo()
+  br label %if.end
+
+if.end:
+  %changed.1.off0 = phi i1 [ true, %if.then ], [ %changed.0.off0, %for.body ]
+  br label %for.cond
+}
+
+declare void @foo()
+
-- 
2.7.4