[Test] Add two more tests on PRE with guards

llvm · Apr 9, 2021 · 65d09bc · 65d09bc
1 parent f6e3b4f
commit 65d09bc
Showing 1 changed file with 102 additions and 0 deletions.
diff --git a/llvm/test/Transforms/GVN/PRE/pre-loop-load.ll b/llvm/test/Transforms/GVN/PRE/pre-loop-load.ll
@@ -633,3 +633,105 @@ exit:
 cold_exit:
   ret i32 -1
 }
+
+declare void @llvm.experimental.guard(i1, ...)
+
+define i32 @test_guard_1(i32* %p, i32 %g) {
+; CHECK-LABEL: @test_guard_1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
+; CHECK-NEXT:    [[GUARD_COND:%.*]] = icmp ne i32 [[IV]], [[G:%.*]]
+; CHECK-NEXT:    call void (i1, ...) @llvm.experimental.guard(i1 [[GUARD_COND]]) [ "deopt"() ]
+; CHECK-NEXT:    [[X:%.*]] = load i32, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    [[COND:%.*]] = icmp ult i32 [[X]], 100
+; CHECK-NEXT:    br i1 [[COND]], label [[HOT_PATH:%.*]], label [[COLD_PATH:%.*]]
+; CHECK:       hot_path:
+; CHECK-NEXT:    br label [[BACKEDGE]]
+; CHECK:       cold_path:
+; CHECK-NEXT:    call void @side_effect()
+; CHECK-NEXT:    br label [[BACKEDGE]]
+; CHECK:       backedge:
+; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], [[X]]
+; CHECK-NEXT:    [[LOOP_COND:%.*]] = icmp ult i32 [[IV_NEXT]], 1000
+; CHECK-NEXT:    br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret i32 [[X]]
+;
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry], [%iv.next, %backedge]
+  %guard_cond = icmp ne i32 %iv, %g
+  call void(i1, ...) @llvm.experimental.guard(i1 %guard_cond) [ "deopt"() ]
+  %x = load i32, i32* %p
+  %cond = icmp ult i32 %x, 100
+  br i1 %cond, label %hot_path, label %cold_path
+
+hot_path:
+  br label %backedge
+
+cold_path:
+  call void @side_effect()
+  br label %backedge
+
+backedge:
+  %iv.next = add i32 %iv, %x
+  %loop.cond = icmp ult i32 %iv.next, 1000
+  br i1 %loop.cond, label %loop, label %exit
+
+exit:
+  ret i32 %x
+}
+
+define i32 @test_guard_2(i32* %p, i32 %g) {
+; CHECK-LABEL: @test_guard_2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
+; CHECK-NEXT:    [[GUARD_COND:%.*]] = icmp ne i32 [[IV]], [[G:%.*]]
+; CHECK-NEXT:    [[X:%.*]] = load i32, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    call void (i1, ...) @llvm.experimental.guard(i1 [[GUARD_COND]]) [ "deopt"() ]
+; CHECK-NEXT:    [[COND:%.*]] = icmp ult i32 [[X]], 100
+; CHECK-NEXT:    br i1 [[COND]], label [[HOT_PATH:%.*]], label [[COLD_PATH:%.*]]
+; CHECK:       hot_path:
+; CHECK-NEXT:    br label [[BACKEDGE]]
+; CHECK:       cold_path:
+; CHECK-NEXT:    call void @side_effect()
+; CHECK-NEXT:    br label [[BACKEDGE]]
+; CHECK:       backedge:
+; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], [[X]]
+; CHECK-NEXT:    [[LOOP_COND:%.*]] = icmp ult i32 [[IV_NEXT]], 1000
+; CHECK-NEXT:    br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret i32 [[X]]
+;
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry], [%iv.next, %backedge]
+  %guard_cond = icmp ne i32 %iv, %g
+  %x = load i32, i32* %p
+  call void(i1, ...) @llvm.experimental.guard(i1 %guard_cond) [ "deopt"() ]
+  %cond = icmp ult i32 %x, 100
+  br i1 %cond, label %hot_path, label %cold_path
+
+hot_path:
+  br label %backedge
+
+cold_path:
+  call void @side_effect()
+  br label %backedge
+
+backedge:
+  %iv.next = add i32 %iv, %x
+  %loop.cond = icmp ult i32 %iv.next, 1000
+  br i1 %loop.cond, label %loop, label %exit
+
+exit:
+  ret i32 %x
+}