[llvm] 09a3737 - [Test] Missing range check removal opportunity

[Max Kazantsev via llvm-commits]

Author: Max Kazantsev
Date: 2020-09-18T17:55:23+07:00
New Revision: 09a3737384ec34c6b216e7c6b9ca768c26ffb1d1

URL: https://github.com/llvm/llvm-project/commit/09a3737384ec34c6b216e7c6b9ca768c26ffb1d1
DIFF: https://github.com/llvm/llvm-project/commit/09a3737384ec34c6b216e7c6b9ca768c26ffb1d1.diff

LOG: [Test] Missing range check removal opportunity

Added: 
    llvm/test/Transforms/IndVarSimplify/checks_against_min_value.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/IndVarSimplify/checks_against_min_value.ll b/llvm/test/Transforms/IndVarSimplify/checks_against_min_value.ll
new file mode 100644
index 000000000000..4575a4547fac
--- /dev/null
+++ b/llvm/test/Transforms/IndVarSimplify/checks_against_min_value.ll
@@ -0,0 +1,89 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -indvars -S | FileCheck %s
+; RUN: opt < %s -passes=indvars -S | FileCheck %s
+
+define void @test_signed(i32 %start) {
+; CHECK-LABEL: @test_signed(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[COND:%.*]] = icmp ne i32 [[START:%.*]], -2147483648
+; CHECK-NEXT:    br i1 [[COND]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]]
+; CHECK:       loop.preheader:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[START]], [[LOOP_PREHEADER]] ]
+; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], -1
+; CHECK-NEXT:    [[CHECK:%.*]] = icmp slt i32 [[IV_NEXT]], [[IV]]
+; CHECK-NEXT:    br i1 [[CHECK]], label [[GUARDED]], label [[FAIL:%.*]]
+; CHECK:       guarded:
+; CHECK-NEXT:    [[LOOP_COND:%.*]] = icmp ne i32 [[IV]], -2147483648
+; CHECK-NEXT:    br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
+; CHECK:       exit.loopexit:
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+; CHECK:       fail:
+; CHECK-NEXT:    unreachable
+;
+entry:
+  %cond = icmp ne i32 %start, -2147483648
+  br i1 %cond, label %loop, label %exit
+
+loop:
+  %iv = phi i32 [%start, %entry], [%iv.next, %guarded]
+  %iv.next = add i32 %iv, -1
+  %check = icmp slt i32 %iv.next, %iv
+  br i1 %check, label %guarded, label %fail
+
+guarded:
+  %loop.cond = icmp ne i32 %iv, -2147483648
+  br i1 %loop.cond, label %loop, label %exit
+
+exit:
+  ret void
+
+fail:
+  unreachable
+}
+
+define void @test_unsigned(i32 %start) {
+; CHECK-LABEL: @test_unsigned(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[COND:%.*]] = icmp ne i32 [[START:%.*]], 0
+; CHECK-NEXT:    br i1 [[COND]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]]
+; CHECK:       loop.preheader:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[START]], [[LOOP_PREHEADER]] ]
+; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], -1
+; CHECK-NEXT:    [[CHECK:%.*]] = icmp ult i32 [[IV_NEXT]], [[IV]]
+; CHECK-NEXT:    br i1 [[CHECK]], label [[GUARDED]], label [[FAIL:%.*]]
+; CHECK:       guarded:
+; CHECK-NEXT:    [[LOOP_COND:%.*]] = icmp ne i32 [[IV]], 0
+; CHECK-NEXT:    br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
+; CHECK:       exit.loopexit:
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+; CHECK:       fail:
+; CHECK-NEXT:    unreachable
+;
+entry:
+  %cond = icmp ne i32 %start, 0
+  br i1 %cond, label %loop, label %exit
+
+loop:
+  %iv = phi i32 [%start, %entry], [%iv.next, %guarded]
+  %iv.next = add i32 %iv, -1
+  %check = icmp ult i32 %iv.next, %iv
+  br i1 %check, label %guarded, label %fail
+
+guarded:
+  %loop.cond = icmp ne i32 %iv, 0
+  br i1 %loop.cond, label %loop, label %exit
+
+exit:
+  ret void
+
+fail:
+  unreachable
+}