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/SimplifyCFG/SpeculativeExec.ll b/llvm/test/Transforms/SimplifyCFG/SpeculativeExec.ll
new file mode 100644
index 0000000..19a7a7e
--- /dev/null
+++ b/llvm/test/Transforms/SimplifyCFG/SpeculativeExec.ll
@@ -0,0 +1,121 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -simplifycfg -phi-node-folding-threshold=2 -S | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define i32 @test1(i32 %a, i32 %b, i32 %c) nounwind {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[B:%.*]], 0
+; CHECK-NEXT: br i1 [[TMP1]], label [[BB1:%.*]], label [[BB3:%.*]]
+; CHECK: bb1:
+; CHECK-NEXT: [[TMP2:%.*]] = icmp sgt i32 [[C:%.*]], 1
+; CHECK-NEXT: [[TMP3:%.*]] = add i32 [[A:%.*]], 1
+; CHECK-NEXT: [[TMP3_A:%.*]] = select i1 [[TMP2]], i32 [[TMP3]], i32 [[A]]
+; CHECK-NEXT: br label [[BB3]]
+; CHECK: bb3:
+; CHECK-NEXT: [[TMP4:%.*]] = phi i32 [ [[B]], [[ENTRY:%.*]] ], [ [[TMP3_A]], [[BB1]] ]
+; CHECK-NEXT: [[TMP5:%.*]] = sub i32 [[TMP4]], 1
+; CHECK-NEXT: ret i32 [[TMP5]]
+;
+entry:
+ %tmp1 = icmp eq i32 %b, 0
+ br i1 %tmp1, label %bb1, label %bb3
+
+bb1: ; preds = %entry
+ %tmp2 = icmp sgt i32 %c, 1
+ br i1 %tmp2, label %bb2, label %bb3
+
+bb2: ; preds = bb1
+ %tmp3 = add i32 %a, 1
+ br label %bb3
+
+bb3: ; preds = %bb2, %entry
+ %tmp4 = phi i32 [ %b, %entry ], [ %a, %bb1 ], [ %tmp3, %bb2 ]
+ %tmp5 = sub i32 %tmp4, 1
+ ret i32 %tmp5
+}
+
+define i8* @test4(i1* %dummy, i8* %a, i8* %b) {
+; Test that we don't speculate an arbitrarily large number of unfolded constant
+; expressions.
+; CHECK-LABEL: @test4(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[COND1:%.*]] = load volatile i1, i1* [[DUMMY:%.*]]
+; CHECK-NEXT: br i1 [[COND1]], label [[IF:%.*]], label [[END:%.*]]
+; CHECK: if:
+; CHECK-NEXT: [[COND2:%.*]] = load volatile i1, i1* [[DUMMY]]
+; CHECK-NEXT: br i1 [[COND2]], label [[THEN:%.*]], label [[END]]
+; CHECK: then:
+; CHECK-NEXT: br label [[END]]
+; CHECK: end:
+; CHECK-NEXT: [[X1:%.*]] = phi i8* [ [[A:%.*]], [[ENTRY:%.*]] ], [ [[B:%.*]], [[IF]] ], [ inttoptr (i64 1 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X2:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 2 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X3:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 3 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X4:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 4 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X5:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 5 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X6:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 6 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X7:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 7 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X8:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 8 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X9:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 9 to i8*), [[THEN]] ]
+; CHECK-NEXT: [[X10:%.*]] = phi i8* [ [[A]], [[ENTRY]] ], [ [[B]], [[IF]] ], [ inttoptr (i64 10 to i8*), [[THEN]] ]
+; CHECK-NEXT: ret i8* [[X10]]
+;
+
+entry:
+ %cond1 = load volatile i1, i1* %dummy
+ br i1 %cond1, label %if, label %end
+
+if:
+ %cond2 = load volatile i1, i1* %dummy
+ br i1 %cond2, label %then, label %end
+
+then:
+ br label %end
+
+end:
+ %x1 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 1 to i8*), %then ]
+ %x2 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 2 to i8*), %then ]
+ %x3 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 3 to i8*), %then ]
+ %x4 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 4 to i8*), %then ]
+ %x5 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 5 to i8*), %then ]
+ %x6 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 6 to i8*), %then ]
+ %x7 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 7 to i8*), %then ]
+ %x8 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 8 to i8*), %then ]
+ %x9 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 9 to i8*), %then ]
+ %x10 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 10 to i8*), %then ]
+
+ ret i8* %x10
+}
+
+define i32* @test5(i32 %a, i32 %b, i32 %c, i32* dereferenceable(10) %ptr1,
+; CHECK-LABEL: @test5(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[B:%.*]], 0
+; CHECK-NEXT: br i1 [[TMP1]], label [[BB1:%.*]], label [[BB3:%.*]]
+; CHECK: bb1:
+; CHECK-NEXT: [[TMP2:%.*]] = icmp sgt i32 [[C:%.*]], 1
+; CHECK-NEXT: [[TMP3:%.*]] = load i32*, i32** [[PTR3:%.*]]
+; CHECK-NEXT: [[TMP3_PTR2:%.*]] = select i1 [[TMP2]], i32* [[TMP3]], i32* [[PTR2:%.*]]
+; CHECK-NEXT: ret i32* [[TMP3_PTR2]]
+; CHECK: bb3:
+; CHECK-NEXT: ret i32* [[PTR1:%.*]]
+;
+ i32* dereferenceable(10) %ptr2, i32** dereferenceable(10) %ptr3) nounwind {
+entry:
+ %tmp1 = icmp eq i32 %b, 0
+ br i1 %tmp1, label %bb1, label %bb3
+
+bb1: ; preds = %entry
+ %tmp2 = icmp sgt i32 %c, 1
+ br i1 %tmp2, label %bb2, label %bb3
+
+bb2: ; preds = bb1
+ %tmp3 = load i32*, i32** %ptr3, !dereferenceable !{i64 10}
+ br label %bb3
+
+bb3: ; preds = %bb2, %entry
+ %tmp4 = phi i32* [ %ptr1, %entry ], [ %ptr2, %bb1 ], [ %tmp3, %bb2 ]
+ ret i32* %tmp4
+}