Rebased PNaCl localmods in LLVM to 223109

test/Transforms/NaCl/expand-arith-with-overflow.ll

Index: test/Transforms/NaCl/expand-arith-with-overflow.ll
diff --git a/test/Transforms/NaCl/expand-arith-with-overflow.ll b/test/Transforms/NaCl/expand-arith-with-overflow.ll
new file mode 100644
index 0000000000000000000000000000000000000000..bff6388e11734b0d8b94b15843bbdd3ac88e40b4
--- /dev/null
+++ b/test/Transforms/NaCl/expand-arith-with-overflow.ll
@@ -0,0 +1,85 @@
+; RUN: opt %s -expand-arith-with-overflow -expand-struct-regs -S | FileCheck %s
+; RUN: opt %s -expand-arith-with-overflow -expand-struct-regs -S | \
+; RUN:     FileCheck %s -check-prefix=CLEANUP
+
+declare {i32, i1} @llvm.umul.with.overflow.i32(i32, i32)
+declare {i64, i1} @llvm.umul.with.overflow.i64(i64, i64)
+declare {i16, i1} @llvm.uadd.with.overflow.i16(i16, i16)
+
+; CLEANUP-NOT: with.overflow
+; CLEANUP-NOT: extractvalue
+; CLEANUP-NOT: insertvalue
+
+
+define void @umul32_by_const(i32 %x, i32* %result_val, i1* %result_overflow) {
+  %pair = call {i32, i1} @llvm.umul.with.overflow.i32(i32 %x, i32 256)
+  %val = extractvalue {i32, i1} %pair, 0
+  %overflow = extractvalue {i32, i1} %pair, 1
+
+  store i32 %val, i32* %result_val
+  store i1 %overflow, i1* %result_overflow
+  ret void
+}
+
+; The bound is 16777215 == 0xffffff == ((1 << 32) - 1) / 256
+; CHECK: define void @umul32_by_const(
+; CHECK-NEXT: %pair.arith = mul i32 %x, 256
+; CHECK-NEXT: %pair.overflow = icmp ugt i32 %x, 16777215
+; CHECK-NEXT: store i32 %pair.arith, i32* %result_val
+; CHECK-NEXT: store i1 %pair.overflow, i1* %result_overflow
+
+
+; Check that the pass can expand multiple uses of the same intrinsic.
+define void @umul32_by_const2(i32 %x, i32* %result_val, i1* %result_overflow) {
+  %pair = call {i32, i1} @llvm.umul.with.overflow.i32(i32 %x, i32 65536)
+  %val = extractvalue {i32, i1} %pair, 0
+  ; Check that the pass can expand multiple uses of %pair.
+  %overflow1 = extractvalue {i32, i1} %pair, 1
+  %overflow2 = extractvalue {i32, i1} %pair, 1
+
+  store i32 %val, i32* %result_val
+  store i1 %overflow1, i1* %result_overflow
+  store i1 %overflow2, i1* %result_overflow
+  ret void
+}
+
+; CHECK: define void @umul32_by_const2(
+; CHECK-NEXT: %pair.arith = mul i32 %x, 65536
+; CHECK-NEXT: %pair.overflow = icmp ugt i32 %x, 65535
+; CHECK-NEXT: store i32 %pair.arith, i32* %result_val
+; CHECK-NEXT: store i1 %pair.overflow, i1* %result_overflow
+; CHECK-NEXT: store i1 %pair.overflow, i1* %result_overflow
+
+
+define void @umul64_by_const(i64 %x, i64* %result_val, i1* %result_overflow) {
+  ; Multiply by 1 << 55.
+  %pair = call {i64, i1} @llvm.umul.with.overflow.i64(i64 36028797018963968, i64 %x)
+  %val = extractvalue {i64, i1} %pair, 0
+  %overflow = extractvalue {i64, i1} %pair, 1
+
+  store i64 %val, i64* %result_val
+  store i1 %overflow, i1* %result_overflow
+  ret void
+}
+
+; CHECK: define void @umul64_by_const(i64 %x, i64* %result_val, i1* %result_overflow) {
+; CHECK-NEXT: %pair.arith = mul i64 %x, 36028797018963968
+; CHECK-NEXT: %pair.overflow = icmp ugt i64 %x, 511
+; CHECK-NEXT: store i64 %pair.arith, i64* %result_val
+; CHECK-NEXT: store i1 %pair.overflow, i1* %result_overflow
+
+
+define void @uadd16_with_const(i16 %x, i16* %result_val, i1* %result_overflow) {
+  %pair = call {i16, i1} @llvm.uadd.with.overflow.i16(i16 %x, i16 35)
+  %val = extractvalue {i16, i1} %pair, 0
+  %overflow = extractvalue {i16, i1} %pair, 1
+
+  store i16 %val, i16* %result_val
+  store i1 %overflow, i1* %result_overflow
+  ret void
+}
+; CHECK: define void @uadd16_with_const(i16 %x, i16* %result_val, i1* %result_overflow) {
+; CHECK-NEXT: %pair.arith = add i16 %x, 35
+; CHECK-NEXT: %pair.overflow = icmp ugt i16 %x, -36
+; CHECK-NEXT: store i16 %pair.arith, i16* %result_val
+; CHECK-NEXT: store i1 %pair.overflow, i1* %result_overflow