Revert "Temporarily Revert "Add basic loop fusion pass.""
The reversion apparently deleted the test/Transforms directory.
Will be re-reverting again.
llvm-svn: 358552
diff --git a/llvm/test/Transforms/IndVarSimplify/backedge-on-min-max.ll b/llvm/test/Transforms/IndVarSimplify/backedge-on-min-max.ll
new file mode 100644
index 0000000..bc846c4
--- /dev/null
+++ b/llvm/test/Transforms/IndVarSimplify/backedge-on-min-max.ll
@@ -0,0 +1,454 @@
+; RUN: opt < %s -indvars -S | FileCheck %s
+; RUN: opt -lcssa -loop-simplify -S < %s | opt -S -passes='require<targetir>,require<scalar-evolution>,require<domtree>,loop(indvars)'
+
+;; --- signed ---
+
+define void @min.signed.1(i32* %a, i32 %a_len, i32 %n) {
+; CHECK-LABEL: @min.signed.1
+ entry:
+ %smin.cmp = icmp slt i32 %a_len, %n
+ %smin = select i1 %smin.cmp, i32 %a_len, i32 %n
+ %entry.cond = icmp slt i32 0, %smin
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 0, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp slt i32 %idx, %a_len
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp slt i32 %idx.inc, %smin
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @min.signed.2(i32* %a, i32 %a_len, i32 %n) {
+; CHECK-LABEL: @min.signed.2
+ entry:
+ %smin.cmp = icmp slt i32 %a_len, %n
+ %smin = select i1 %smin.cmp, i32 %a_len, i32 %n
+ %entry.cond = icmp slt i32 0, %smin
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 0, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp sgt i32 %a_len, %idx
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp slt i32 %idx.inc, %smin
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @min.signed.3(i32* %a, i32 %n) {
+; CHECK-LABEL: @min.signed.3
+ entry:
+ %smin.cmp = icmp slt i32 42, %n
+ %smin = select i1 %smin.cmp, i32 42, i32 %n
+ %entry.cond = icmp slt i32 0, %smin
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 0, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp slt i32 %idx, 42
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp slt i32 %idx.inc, %smin
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @min.signed.4(i32* %a, i32 %n) {
+; CHECK-LABEL: @min.signed.4
+ entry:
+ %smin.cmp = icmp slt i32 42, %n
+ %smin = select i1 %smin.cmp, i32 42, i32 %n
+ %entry.cond = icmp slt i32 0, %smin
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 0, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp sgt i32 42, %idx
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp slt i32 %idx.inc, %smin
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @max.signed.1(i32* %a, i32 %a_len, i32 %n) {
+; CHECK-LABEL: @max.signed.1
+ entry:
+ %smax.cmp = icmp sgt i32 %a_len, %n
+ %smax = select i1 %smax.cmp, i32 %a_len, i32 %n
+ %entry.cond = icmp sgt i32 0, %smax
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 0, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp sgt i32 %idx, %a_len
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp sgt i32 %idx.inc, %smax
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @max.signed.2(i32* %a, i32 %a_len, i32 %n) {
+; CHECK-LABEL: @max.signed.2
+ entry:
+ %smax.cmp = icmp sgt i32 %a_len, %n
+ %smax = select i1 %smax.cmp, i32 %a_len, i32 %n
+ %entry.cond = icmp sgt i32 0, %smax
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 0, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp slt i32 %a_len, %idx
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp sgt i32 %idx.inc, %smax
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @max.signed.3(i32* %a, i32 %n, i32 %init) {
+; CHECK-LABEL: @max.signed.3
+ entry:
+ %smax.cmp = icmp sgt i32 42, %n
+ %smax = select i1 %smax.cmp, i32 42, i32 %n
+ %entry.cond = icmp sgt i32 %init, %smax
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ %init, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp sgt i32 %idx, 42
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp sgt i32 %idx.inc, %smax
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @max.signed.4(i32* %a, i32 %n, i32 %init) {
+; CHECK-LABEL: @max.signed.4
+ entry:
+ %smax.cmp = icmp sgt i32 42, %n
+ %smax = select i1 %smax.cmp, i32 42, i32 %n
+ %entry.cond = icmp sgt i32 %init, %smax
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ %init, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp slt i32 42, %idx
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp sgt i32 %idx.inc, %smax
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+;; --- unsigned ---
+
+define void @min.unsigned.1(i32* %a, i32 %a_len, i32 %n) {
+; CHECK-LABEL: @min.unsigned.1
+ entry:
+ %umin.cmp = icmp ult i32 %a_len, %n
+ %umin = select i1 %umin.cmp, i32 %a_len, i32 %n
+ %entry.cond = icmp ult i32 5, %umin
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 5, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp ult i32 %idx, %a_len
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp ult i32 %idx.inc, %umin
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @min.unsigned.2(i32* %a, i32 %a_len, i32 %n) {
+; CHECK-LABEL: @min.unsigned.2
+ entry:
+ %umin.cmp = icmp ult i32 %a_len, %n
+ %umin = select i1 %umin.cmp, i32 %a_len, i32 %n
+ %entry.cond = icmp ult i32 5, %umin
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 5, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp ugt i32 %a_len, %idx
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp ult i32 %idx.inc, %umin
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @min.unsigned.3(i32* %a, i32 %n) {
+; CHECK-LABEL: @min.unsigned.3
+ entry:
+ %umin.cmp = icmp ult i32 42, %n
+ %umin = select i1 %umin.cmp, i32 42, i32 %n
+ %entry.cond = icmp ult i32 5, %umin
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 5, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp ult i32 %idx, 42
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp ult i32 %idx.inc, %umin
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @min.unsigned.4(i32* %a, i32 %n) {
+; CHECK-LABEL: @min.unsigned.4
+ entry:
+ %umin.cmp = icmp ult i32 42, %n
+ %umin = select i1 %umin.cmp, i32 42, i32 %n
+ %entry.cond = icmp ult i32 5, %umin
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 5, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp ugt i32 42, %idx
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp ult i32 %idx.inc, %umin
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @max.unsigned.1(i32* %a, i32 %a_len, i32 %n) {
+; CHECK-LABEL: @max.unsigned.1
+ entry:
+ %umax.cmp = icmp ugt i32 %a_len, %n
+ %umax = select i1 %umax.cmp, i32 %a_len, i32 %n
+ %entry.cond = icmp ugt i32 5, %umax
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 5, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp ugt i32 %idx, %a_len
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp ugt i32 %idx.inc, %umax
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @max.unsigned.2(i32* %a, i32 %a_len, i32 %n) {
+; CHECK-LABEL: @max.unsigned.2
+ entry:
+ %umax.cmp = icmp ugt i32 %a_len, %n
+ %umax = select i1 %umax.cmp, i32 %a_len, i32 %n
+ %entry.cond = icmp ugt i32 5, %umax
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ 5, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp ult i32 %a_len, %idx
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp ugt i32 %idx.inc, %umax
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @max.unsigned.3(i32* %a, i32 %n, i32 %init) {
+; CHECK-LABEL: @max.unsigned.3
+ entry:
+ %umax.cmp = icmp ugt i32 42, %n
+ %umax = select i1 %umax.cmp, i32 42, i32 %n
+ %entry.cond = icmp ugt i32 %init, %umax
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ %init, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp ugt i32 %idx, 42
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp ugt i32 %idx.inc, %umax
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}
+
+define void @max.unsigned.4(i32* %a, i32 %n, i32 %init) {
+; CHECK-LABEL: @max.unsigned.4
+ entry:
+ %umax.cmp = icmp ugt i32 42, %n
+ %umax = select i1 %umax.cmp, i32 42, i32 %n
+ %entry.cond = icmp ugt i32 %init, %umax
+ br i1 %entry.cond, label %loop, label %exit
+
+ loop:
+ %idx = phi i32 [ %init, %entry ], [ %idx.inc, %latch ]
+ %idx.inc = add i32 %idx, 1
+ %in.bounds = icmp ult i32 42, %idx
+ br i1 %in.bounds, label %ok, label %latch
+; CHECK: br i1 true, label %ok, label %latch
+
+ ok:
+ %addr = getelementptr i32, i32* %a, i32 %idx
+ store i32 %idx, i32* %addr
+ br label %latch
+
+ latch:
+ %be.cond = icmp ugt i32 %idx.inc, %umax
+ br i1 %be.cond, label %loop, label %exit
+
+ exit:
+ ret void
+}