From 9f93d30a26ae9928f886ef7271efeafcea2a00a6 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Sat, 24 Apr 2010 03:09:42 +0000
Subject: ScalarEvolution support for <= and >= loops.

Also, generalize ScalarEvolutions's min and max recognition to handle
some new forms of min and max that this change makes more common.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102234 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../ScalarEvolution/2008-11-18-LessThanOrEqual.ll  |  1 -
 .../ScalarEvolution/2008-12-08-FiniteSGE.ll        |  1 -
 .../ScalarEvolution/2008-12-11-SMaxOverflow.ll     |  6 +++--
 test/Analysis/ScalarEvolution/sle.ll               | 27 ++++++++++++++++++++++
 4 files changed, 31 insertions(+), 4 deletions(-)
 create mode 100644 test/Analysis/ScalarEvolution/sle.ll

(limited to 'test/Analysis')

diff --git a/test/Analysis/ScalarEvolution/2008-11-18-LessThanOrEqual.ll b/test/Analysis/ScalarEvolution/2008-11-18-LessThanOrEqual.ll
index 06637b5eae..335bbaf9ad 100644
--- a/test/Analysis/ScalarEvolution/2008-11-18-LessThanOrEqual.ll
+++ b/test/Analysis/ScalarEvolution/2008-11-18-LessThanOrEqual.ll
@@ -1,6 +1,5 @@
 ; RUN: opt < %s -analyze -scalar-evolution |& \
 ; RUN: grep {Loop %bb: backedge-taken count is (7 + (-1 \\* %argc))}
-; XFAIL: *
 
 define i32 @main(i32 %argc, i8** %argv) nounwind {
 entry:
diff --git a/test/Analysis/ScalarEvolution/2008-12-08-FiniteSGE.ll b/test/Analysis/ScalarEvolution/2008-12-08-FiniteSGE.ll
index 226221b297..25a0434b29 100644
--- a/test/Analysis/ScalarEvolution/2008-12-08-FiniteSGE.ll
+++ b/test/Analysis/ScalarEvolution/2008-12-08-FiniteSGE.ll
@@ -1,5 +1,4 @@
 ; RUN: opt < %s -analyze -scalar-evolution | grep {backedge-taken count is 255}
-; XFAIL: *
 
 define i32 @foo(i32 %x, i32 %y, i32* %lam, i32* %alp) nounwind {
 bb1.thread:
diff --git a/test/Analysis/ScalarEvolution/2008-12-11-SMaxOverflow.ll b/test/Analysis/ScalarEvolution/2008-12-11-SMaxOverflow.ll
index 33a74795d2..12254e37dc 100644
--- a/test/Analysis/ScalarEvolution/2008-12-11-SMaxOverflow.ll
+++ b/test/Analysis/ScalarEvolution/2008-12-11-SMaxOverflow.ll
@@ -1,5 +1,7 @@
-; RUN: opt < %s -analyze -scalar-evolution | grep {0 smax}
-; XFAIL: *
+; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
+
+; CHECK: @f
+; CHECK: Loop %bb16.preheader: backedge-taken count is (-1 + %c.idx.val)
 
 define i32 @f(i32 %c.idx.val) {
 
diff --git a/test/Analysis/ScalarEvolution/sle.ll b/test/Analysis/ScalarEvolution/sle.ll
new file mode 100644
index 0000000000..f38f6b63dc
--- /dev/null
+++ b/test/Analysis/ScalarEvolution/sle.ll
@@ -0,0 +1,27 @@
+; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
+
+; ScalarEvolution should be able to use nsw information to prove that
+; this loop has a finite trip count.
+
+; CHECK: @le
+; CHECK: Loop %for.body: backedge-taken count is %n
+; CHECK: Loop %for.body: max backedge-taken count is 9223372036854775807
+
+define void @le(i64 %n, double* nocapture %p) nounwind {
+entry:
+  %cmp6 = icmp slt i64 %n, 0                      ; <i1> [#uses=1]
+  br i1 %cmp6, label %for.end, label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %i = phi i64 [ %i.next, %for.body ], [ 0, %entry ] ; <i64> [#uses=2]
+  %arrayidx = getelementptr double* %p, i64 %i    ; <double*> [#uses=2]
+  %t4 = load double* %arrayidx                    ; <double> [#uses=1]
+  %mul = fmul double %t4, 2.200000e+00            ; <double> [#uses=1]
+  store double %mul, double* %arrayidx
+  %i.next = add nsw i64 %i, 1                     ; <i64> [#uses=2]
+  %cmp = icmp sgt i64 %i.next, %n                 ; <i1> [#uses=1]
+  br i1 %cmp, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body, %entry
+  ret void
+}
-- 
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