[llvm] 1598595 - [Test] Add tests where we can replace condition with invariants
Max Kazantsev via llvm-commits
llvm-commits at lists.llvm.org
Sun Sep 27 22:05:08 PDT 2020
Author: Max Kazantsev
Date: 2020-09-28T12:04:20+07:00
New Revision: 15985952aca66fcd5ae8b6c8a007a3a694848a03
URL: https://github.com/llvm/llvm-project/commit/15985952aca66fcd5ae8b6c8a007a3a694848a03
DIFF: https://github.com/llvm/llvm-project/commit/15985952aca66fcd5ae8b6c8a007a3a694848a03.diff
LOG: [Test] Add tests where we can replace condition with invariants
Added:
Modified:
llvm/test/Transforms/IndVarSimplify/predicated_ranges.ll
Removed:
################################################################################
diff --git a/llvm/test/Transforms/IndVarSimplify/predicated_ranges.ll b/llvm/test/Transforms/IndVarSimplify/predicated_ranges.ll
index 159caf014e3c..44df970b63b6 100644
--- a/llvm/test/Transforms/IndVarSimplify/predicated_ranges.ll
+++ b/llvm/test/Transforms/IndVarSimplify/predicated_ranges.ll
@@ -468,4 +468,104 @@ exit:
ret void
}
+define void @test_can_predicate_simple_unsigned(i32* %p, i32* %arr) {
+; CHECK-LABEL: @test_can_predicate_simple_unsigned(
+; CHECK-NEXT: preheader:
+; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4
+; CHECK-NEXT: br label [[LOOP:%.*]]
+; CHECK: loop:
+; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
+; CHECK-NEXT: [[ZERO_COND:%.*]] = icmp eq i32 [[IV]], 0
+; CHECK-NEXT: br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
+; CHECK: range_check_block:
+; CHECK-NEXT: [[IV_NEXT]] = sub i32 [[IV]], 1
+; CHECK-NEXT: [[RANGE_CHECK:%.*]] = icmp ult i32 [[IV_NEXT]], [[LEN]]
+; CHECK-NEXT: br i1 [[RANGE_CHECK]], label [[BACKEDGE]], label [[FAIL:%.*]]
+; CHECK: backedge:
+; CHECK-NEXT: [[EL_PTR:%.*]] = getelementptr i32, i32* [[P]], i32 [[IV]]
+; CHECK-NEXT: [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
+; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
+; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+; CHECK: fail:
+; CHECK-NEXT: unreachable
+;
+preheader:
+ %len = load i32, i32* %p
+ br label %loop
+
+loop:
+ %iv = phi i32 [%len, %preheader], [%iv.next, %backedge]
+ %zero_cond = icmp eq i32 %iv, 0
+ br i1 %zero_cond, label %exit, label %range_check_block
+
+range_check_block:
+ %iv.next = sub i32 %iv, 1
+ %range_check = icmp ult i32 %iv.next, %len
+ br i1 %range_check, label %backedge, label %fail
+
+backedge:
+ %el.ptr = getelementptr i32, i32* %p, i32 %iv
+ %el = load i32, i32* %el.ptr
+ %loop.cond = icmp eq i32 %el, 0
+ br i1 %loop.cond, label %loop, label %exit
+
+exit:
+ ret void
+
+fail:
+ unreachable
+}
+
+define void @test_can_predicate_simple_signed(i32* %p, i32* %arr) {
+; CHECK-LABEL: @test_can_predicate_simple_signed(
+; CHECK-NEXT: preheader:
+; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4
+; CHECK-NEXT: br label [[LOOP:%.*]]
+; CHECK: loop:
+; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
+; CHECK-NEXT: [[ZERO_COND:%.*]] = icmp eq i32 [[IV]], 0
+; CHECK-NEXT: br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
+; CHECK: range_check_block:
+; CHECK-NEXT: [[IV_NEXT]] = sub i32 [[IV]], 1
+; CHECK-NEXT: [[RANGE_CHECK:%.*]] = icmp slt i32 [[IV_NEXT]], [[LEN]]
+; CHECK-NEXT: br i1 [[RANGE_CHECK]], label [[BACKEDGE]], label [[FAIL:%.*]]
+; CHECK: backedge:
+; CHECK-NEXT: [[EL_PTR:%.*]] = getelementptr i32, i32* [[P]], i32 [[IV]]
+; CHECK-NEXT: [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
+; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
+; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+; CHECK: fail:
+; CHECK-NEXT: unreachable
+;
+preheader:
+ %len = load i32, i32* %p
+ br label %loop
+
+loop:
+ %iv = phi i32 [%len, %preheader], [%iv.next, %backedge]
+ %zero_cond = icmp eq i32 %iv, 0
+ br i1 %zero_cond, label %exit, label %range_check_block
+
+range_check_block:
+ %iv.next = sub i32 %iv, 1
+ %range_check = icmp slt i32 %iv.next, %len
+ br i1 %range_check, label %backedge, label %fail
+
+backedge:
+ %el.ptr = getelementptr i32, i32* %p, i32 %iv
+ %el = load i32, i32* %el.ptr
+ %loop.cond = icmp eq i32 %el, 0
+ br i1 %loop.cond, label %loop, label %exit
+
+exit:
+ ret void
+
+fail:
+ unreachable
+}
+
!0 = !{i32 0, i32 2147483647}
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