1 files changed, 127 insertions, 0 deletions
diff --git a/llvm/test/Transforms/ConstantHoisting/X86/bad-cases.ll b/llvm/test/Transforms/ConstantHoisting/X86/bad-cases.ll
new file mode 100644
index 00000000000..8d0e9e00156
--- /dev/null
+++ b/llvm/test/Transforms/ConstantHoisting/X86/bad-cases.ll
@@ -0,0 +1,127 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -consthoist -S < %s | FileCheck %s
+target triple = "x86_64--"
+
+; We don't want to convert constant divides because the benefit from converting
+; them to a mul in the backend is larget than constant materialization savings.
+define void @signed_const_division(i64 %in1, i64 %in2, i64* %addr) {
+; CHECK-LABEL: @signed_const_division(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[L1:%.*]] = phi i64 [ [[RES1:%.*]], [[LOOP]] ], [ [[IN1:%.*]], [[ENTRY:%.*]] ]
+; CHECK-NEXT:    [[L2:%.*]] = phi i64 [ [[RES2:%.*]], [[LOOP]] ], [ [[IN2:%.*]], [[ENTRY]] ]
+; CHECK-NEXT:    [[RES1]] = sdiv i64 [[L1]], 4294967296
+; CHECK-NEXT:    store volatile i64 [[RES1]], i64* [[ADDR:%.*]]
+; CHECK-NEXT:    [[RES2]] = srem i64 [[L2]], 4294967296
+; CHECK-NEXT:    store volatile i64 [[RES2]], i64* [[ADDR]]
+; CHECK-NEXT:    [[AGAIN:%.*]] = icmp eq i64 [[RES1]], [[RES2]]
+; CHECK-NEXT:    br i1 [[AGAIN]], label [[LOOP]], label [[END:%.*]]
+; CHECK:       end:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop
+
+loop:
+  %l1 = phi i64 [%res1, %loop], [%in1, %entry]
+  %l2 = phi i64 [%res2, %loop], [%in2, %entry]
+  %res1 = sdiv i64 %l1, 4294967296
+  store volatile i64 %res1, i64* %addr
+  %res2 = srem i64 %l2, 4294967296
+  store volatile i64 %res2, i64* %addr
+  %again = icmp eq i64 %res1, %res2
+  br i1 %again, label %loop, label %end
+
+end:
+  ret void
+}
+
+define void @unsigned_const_division(i64 %in1, i64 %in2, i64* %addr) {
+; CHECK-LABEL: @unsigned_const_division(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[L1:%.*]] = phi i64 [ [[RES1:%.*]], [[LOOP]] ], [ [[IN1:%.*]], [[ENTRY:%.*]] ]
+; CHECK-NEXT:    [[L2:%.*]] = phi i64 [ [[RES2:%.*]], [[LOOP]] ], [ [[IN2:%.*]], [[ENTRY]] ]
+; CHECK-NEXT:    [[RES1]] = udiv i64 [[L1]], 4294967296
+; CHECK-NEXT:    store volatile i64 [[RES1]], i64* [[ADDR:%.*]]
+; CHECK-NEXT:    [[RES2]] = urem i64 [[L2]], 4294967296
+; CHECK-NEXT:    store volatile i64 [[RES2]], i64* [[ADDR]]
+; CHECK-NEXT:    [[AGAIN:%.*]] = icmp eq i64 [[RES1]], [[RES2]]
+; CHECK-NEXT:    br i1 [[AGAIN]], label [[LOOP]], label [[END:%.*]]
+; CHECK:       end:
+; CHECK-NEXT:    ret void
+;
+
+entry:
+  br label %loop
+
+loop:
+  %l1 = phi i64 [%res1, %loop], [%in1, %entry]
+  %l2 = phi i64 [%res2, %loop], [%in2, %entry]
+  %res1 = udiv i64 %l1, 4294967296
+  store volatile i64 %res1, i64* %addr
+  %res2 = urem i64 %l2, 4294967296
+  store volatile i64 %res2, i64* %addr
+  %again = icmp eq i64 %res1, %res2
+  br i1 %again, label %loop, label %end
+
+end:
+  ret void
+}
+
+define i32 @PR40934() {
+; CHECK-LABEL: @PR40934(
+; CHECK-NEXT:    ret i32 undef
+; CHECK:       bb:
+; CHECK-NEXT:    [[T2:%.*]] = call i32 (i64, ...) bitcast (i32 (...)* @d to i32 (i64, ...)*)(i64 7788015061)
+; CHECK-NEXT:    [[T3:%.*]] = and i64 [[T3]], 7788015061
+; CHECK-NEXT:    br label [[BB:%.*]]
+;
+  ret i32 undef
+
+bb:
+  %t2 = call i32 (i64, ...) bitcast (i32 (...)* @d to i32 (i64, ...)*)(i64 7788015061)
+  %t3 = and i64 %t3, 7788015061
+  br label %bb
+}
+
+declare i32 @d(...)
+
+define i32 @PR40930() {
+; CHECK-LABEL: @PR40930(
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    [[TMP:%.*]] = alloca i32, align 4
+; CHECK-NEXT:    br label [[BB1:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB2:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br label [[BB2]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[TMP4:%.*]] = call i32 (i64, i64, ...) bitcast (i32 (...)* @c to i32 (i64, i64, ...)*)(i64 4208870971, i64 4208870971)
+; CHECK-NEXT:    br label [[BB1]]
+; CHECK:       bb5:
+; CHECK-NEXT:    [[TMP6:%.*]] = load i32, i32* [[TMP]], align 4
+; CHECK-NEXT:    ret i32 [[TMP6]]
+;
+bb:
+  %tmp = alloca i32, align 4
+  br label %bb1
+
+bb1:                                              ; preds = %bb3, %bb
+  br label %bb2
+
+bb2:                                              ; preds = %bb2, %bb1
+  br label %bb2
+
+bb3:                                              ; No predecessors!
+  %tmp4 = call i32 (i64, i64, ...) bitcast (i32 (...)* @c to i32 (i64, i64, ...)*)(i64 4208870971, i64 4208870971)
+  br label %bb1
+
+bb5:                                              ; No predecessors!
+  %tmp6 = load i32, i32* %tmp, align 4
+  ret i32 %tmp6
+}
+
+declare i32 @c(...)