From 152efbc19a88a85030cb98e6a83a2a17a4eb6ee9 Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Mon, 19 Apr 2021 16:41:27 -0400
Subject: [PATCH] [PhaseOrdering] add test to show unintended code sinking; NFC

See D87479 for discussion.
---
 llvm/test/Transforms/PhaseOrdering/lto-licm.ll | 49 ++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 llvm/test/Transforms/PhaseOrdering/lto-licm.ll

diff --git a/llvm/test/Transforms/PhaseOrdering/lto-licm.ll b/llvm/test/Transforms/PhaseOrdering/lto-licm.ll
new file mode 100644
index 0000000..41e8c81
--- /dev/null
+++ b/llvm/test/Transforms/PhaseOrdering/lto-licm.ll
@@ -0,0 +1,49 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -enable-new-pm=0 -std-link-opts -S < %s  | FileCheck %s
+; RUN: opt -passes='lto<O3>'               -S < %s  | FileCheck %s
+
+define void @hoist_fdiv(float* %a, float %b) {
+; CHECK-LABEL: @hoist_fdiv(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[FOR_COND:%.*]]
+; CHECK:       for.cond:
+; CHECK-NEXT:    [[I_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
+; CHECK-NEXT:    [[CMP_NOT:%.*]] = icmp eq i32 [[I_0]], 1024
+; CHECK-NEXT:    br i1 [[CMP_NOT]], label [[FOR_END:%.*]], label [[FOR_INC]]
+; CHECK:       for.inc:
+; CHECK-NEXT:    [[IDXPROM:%.*]] = zext i32 [[I_0]] to i64
+; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds float, float* [[A:%.*]], i64 [[IDXPROM]]
+; CHECK-NEXT:    [[TMP0:%.*]] = load float, float* [[ARRAYIDX]], align 4
+; CHECK-NEXT:    [[TMP1:%.*]] = fdiv fast float [[TMP0]], [[B:%.*]]
+; CHECK-NEXT:    store float [[TMP1]], float* [[ARRAYIDX]], align 4
+; CHECK-NEXT:    [[INC]] = add nuw nsw i32 [[I_0]], 1
+; CHECK-NEXT:    br label [[FOR_COND]]
+; CHECK:       for.end:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %for.cond
+
+for.cond:
+  %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
+  %cmp = icmp ne i32 %i.0, 1024
+  br i1 %cmp, label %for.body, label %for.cond.cleanup
+
+for.cond.cleanup:
+  br label %for.end
+
+for.body:
+  %idxprom = sext i32 %i.0 to i64
+  %arrayidx = getelementptr inbounds float, float* %a, i64 %idxprom
+  %0 = load float, float* %arrayidx, align 4
+  %div = fdiv fast float %0, %b
+  store float %div, float* %arrayidx, align 4
+  br label %for.inc
+
+for.inc:
+  %inc = add nsw i32 %i.0, 1
+  br label %for.cond
+
+for.end:
+  ret void
+}
-- 
2.7.4