From: Florian Hahn <flo@fhahn.com>
Date: Mon, 12 Jun 2023 16:07:01 +0000 (+0100)
Subject: [ConstraintElim] Extend monotonic phi test coverage.
X-Git-Tag: upstream/17.0.6~5395
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=06dab8f7438a7aae82157714c5b502680f78a382;p=platform%2Fupstream%2Fllvm.git

[ConstraintElim] Extend monotonic phi test coverage.

Add additional tests which exposed some crashes in upcoming patches and
test for and-implied-by-operands handling.
---

diff --git a/llvm/test/Transforms/ConstraintElimination/and-implied-by-operands.ll b/llvm/test/Transforms/ConstraintElimination/and-implied-by-operands.ll
index 3b7674d..58b891f 100644
--- a/llvm/test/Transforms/ConstraintElimination/and-implied-by-operands.ll
+++ b/llvm/test/Transforms/ConstraintElimination/and-implied-by-operands.ll
@@ -263,3 +263,59 @@ exit:
   %res = phi i1 [ %c.1, %entry ], [ %sel, %then ]
   ret i1 %res
 }
+
+declare void @use(ptr)
+
+define void @test_monotonic_ptr_iv_inc_1_eq_to_uge(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_eq_to_uge(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT:    br label [[LOOP_PH:%.*]]
+; CHECK:       loop.ph:
+; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
+; CHECK:       loop.header:
+; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp sgt i16 [[LEN]], 0
+; CHECK-NEXT:    [[C:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT:    [[AND_0:%.*]] = and i1 [[LEN_NEG]], [[C]]
+; CHECK-NEXT:    br i1 [[AND_0]], label [[FOR_BODY:%.*]], label [[EXIT:%.*]]
+; CHECK:       for.body:
+; CHECK-NEXT:    [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT:    [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
+; CHECK-NEXT:    br label [[LOOP_HEADER]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %upper = getelementptr inbounds i32, ptr %start, i16 %len
+  br label %loop.ph
+
+loop.ph:
+  br label %loop.header
+
+loop.header:
+  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+  %len.neg = icmp sgt i16 %len, 0
+  %c = icmp ne ptr %ptr.iv, %upper
+  %and.0 = and i1 %len.neg, %c
+  br i1 %and.0, label %for.body, label %exit
+
+for.body:
+  %t.1 = icmp uge ptr %ptr.iv, %start
+  %t.2 = icmp ult ptr %ptr.iv, %upper
+  %and = and i1 %t.1, %t.2
+  br i1 %and, label %loop.latch, label %exit
+
+loop.latch:
+  call void @use(ptr %ptr.iv)
+  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
+  br label %loop.header
+
+exit:
+  ret void
+}
diff --git a/llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis-crashes.ll b/llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis-crashes.ll
new file mode 100644
index 0000000..37e0bac
--- /dev/null
+++ b/llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis-crashes.ll
@@ -0,0 +1,100 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
+
+declare i1 @cond()
+declare void @clobber()
+
+
+define void @test_unreachable_latch(ptr %start, ptr %b) {
+; CHECK-LABEL: define void @test_unreachable_latch
+; CHECK-SAME: (ptr [[START:%.*]], ptr [[B:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
+; CHECK:       loop.header:
+; CHECK-NEXT:    [[NODE_1:%.*]] = phi ptr [ [[START]], [[ENTRY:%.*]] ], [ null, [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[C_0:%.*]] = icmp ne ptr [[NODE_1]], null
+; CHECK-NEXT:    br i1 [[C_0]], label [[THEN:%.*]], label [[EXIT:%.*]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    call void @clobber()
+; CHECK-NEXT:    br label [[LOOP_HEADER]]
+; CHECK:       if:
+; CHECK-NEXT:    [[C_2:%.*]] = icmp ne ptr [[B]], null
+; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_0]]
+; CHECK-NEXT:    br i1 [[AND]], label [[THEN]], label [[EXIT]]
+; CHECK:       then:
+; CHECK-NEXT:    call void @clobber()
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop.header
+
+loop.header:
+  %node.1 = phi ptr [ %start, %entry ], [ null, %loop.latch ]
+  %c.0 = icmp ne ptr %node.1, null
+  br i1 %c.0, label %then, label %exit
+
+loop.latch:                                     ; No predecessors!
+  call void @clobber()
+  br label %loop.header
+
+if:
+  %c.2 = icmp ne ptr %b, null
+  %and = and i1 %c.2, %c.0
+  br i1 %and, label %then, label %exit
+
+then:
+  call void @clobber()
+  br label %exit
+
+exit:
+  ret void
+}
+
+define void @test_cond_multi_use_with_one_use_simplified_before_adding_ne_fact(ptr %start, ptr %b) {
+; CHECK-LABEL: define void @test_cond_multi_use_with_one_use_simplified_before_adding_ne_fact
+; CHECK-SAME: (ptr [[START:%.*]], ptr [[B:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
+; CHECK:       loop.header:
+; CHECK-NEXT:    [[NODE_1:%.*]] = phi ptr [ [[START]], [[ENTRY:%.*]] ], [ null, [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[C_0:%.*]] = icmp ne ptr [[NODE_1]], null
+; CHECK-NEXT:    br i1 [[C_0]], label [[LOOP_LATCH]], label [[EXIT:%.*]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
+; CHECK-NEXT:    br i1 [[C_1]], label [[IF:%.*]], label [[LOOP_HEADER]]
+; CHECK:       if:
+; CHECK-NEXT:    [[C_2:%.*]] = icmp ne ptr [[B]], null
+; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_0]]
+; CHECK-NEXT:    br i1 [[AND]], label [[THEN:%.*]], label [[EXIT]]
+; CHECK:       then:
+; CHECK-NEXT:    call void @clobber()
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop.header
+
+loop.header:
+  %node.1 = phi ptr [ %start, %entry ], [ null, %loop.latch ]
+  %c.0 = icmp ne ptr %node.1, null
+  br i1 %c.0, label %loop.latch, label %exit
+
+loop.latch:
+  %c.1 = call i1 @cond()
+  br i1 %c.1, label %if, label %loop.header
+
+if:
+  %c.2 = icmp ne ptr %b, null
+  %and = and i1 %c.2, %c.0
+  br i1 %and, label %then, label %exit
+
+then:
+  call void @clobber()
+  br label %exit
+
+exit:
+  ret void
+}