Don't use std::abs on INT_MIN/LONG_MIN, it's undefined.
bug:25494265
Change-Id: I560a3a589b92440020285f9adfdf7c9efb06217c
diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index 58feb67..35c2c43 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -2846,8 +2846,7 @@
Register dividend = locations->InAt(0).AsRegister<Register>();
Register temp = locations->GetTemp(0).AsRegister<Register>();
int32_t imm = second.GetConstant()->AsIntConstant()->GetValue();
- uint32_t abs_imm = static_cast<uint32_t>(std::abs(imm));
- DCHECK(IsPowerOfTwo(abs_imm));
+ uint32_t abs_imm = static_cast<uint32_t>(AbsOrMin(imm));
int ctz_imm = CTZ(abs_imm);
if (ctz_imm == 1) {
@@ -2923,7 +2922,7 @@
// Do not generate anything. DivZeroCheck would prevent any code to be executed.
} else if (imm == 1 || imm == -1) {
DivRemOneOrMinusOne(instruction);
- } else if (IsPowerOfTwo(std::abs(imm))) {
+ } else if (IsPowerOfTwo(AbsOrMin(imm))) {
DivRemByPowerOfTwo(instruction);
} else {
DCHECK(imm <= -2 || imm >= 2);
@@ -2952,12 +2951,12 @@
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::ConstantLocation(div->InputAt(1)->AsConstant()));
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
- int32_t abs_imm = std::abs(div->InputAt(1)->AsIntConstant()->GetValue());
- if (abs_imm <= 1) {
+ int32_t value = div->InputAt(1)->AsIntConstant()->GetValue();
+ if (value == 1 || value == 0 || value == -1) {
// No temp register required.
} else {
locations->AddTemp(Location::RequiresRegister());
- if (!IsPowerOfTwo(abs_imm)) {
+ if (!IsPowerOfTwo(AbsOrMin(value))) {
locations->AddTemp(Location::RequiresRegister());
}
}
@@ -3078,12 +3077,12 @@
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::ConstantLocation(rem->InputAt(1)->AsConstant()));
locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
- int32_t abs_imm = std::abs(rem->InputAt(1)->AsIntConstant()->GetValue());
- if (abs_imm <= 1) {
+ int32_t value = rem->InputAt(1)->AsIntConstant()->GetValue();
+ if (value == 1 || value == 0 || value == -1) {
// No temp register required.
} else {
locations->AddTemp(Location::RequiresRegister());
- if (!IsPowerOfTwo(abs_imm)) {
+ if (!IsPowerOfTwo(AbsOrMin(value))) {
locations->AddTemp(Location::RequiresRegister());
}
}
diff --git a/compiler/optimizing/code_generator_arm64.cc b/compiler/optimizing/code_generator_arm64.cc
index b49f42b..5b719f2 100644
--- a/compiler/optimizing/code_generator_arm64.cc
+++ b/compiler/optimizing/code_generator_arm64.cc
@@ -2534,8 +2534,7 @@
Register out = OutputRegister(instruction);
Register dividend = InputRegisterAt(instruction, 0);
int64_t imm = Int64FromConstant(second.GetConstant());
- uint64_t abs_imm = static_cast<uint64_t>(std::abs(imm));
- DCHECK(IsPowerOfTwo(abs_imm));
+ uint64_t abs_imm = static_cast<uint64_t>(AbsOrMin(imm));
int ctz_imm = CTZ(abs_imm);
UseScratchRegisterScope temps(GetVIXLAssembler());
@@ -2627,7 +2626,7 @@
// Do not generate anything. DivZeroCheck would prevent any code to be executed.
} else if (imm == 1 || imm == -1) {
DivRemOneOrMinusOne(instruction);
- } else if (IsPowerOfTwo(std::abs(imm))) {
+ } else if (IsPowerOfTwo(AbsOrMin(imm))) {
DivRemByPowerOfTwo(instruction);
} else {
DCHECK(imm <= -2 || imm >= 2);
diff --git a/compiler/optimizing/code_generator_mips.cc b/compiler/optimizing/code_generator_mips.cc
index 07efdee..e306432 100644
--- a/compiler/optimizing/code_generator_mips.cc
+++ b/compiler/optimizing/code_generator_mips.cc
@@ -2192,8 +2192,7 @@
Register out = locations->Out().AsRegister<Register>();
Register dividend = locations->InAt(0).AsRegister<Register>();
int32_t imm = second.GetConstant()->AsIntConstant()->GetValue();
- uint32_t abs_imm = static_cast<uint32_t>(std::abs(imm));
- DCHECK(IsPowerOfTwo(abs_imm));
+ uint32_t abs_imm = static_cast<uint32_t>(AbsOrMin(imm));
int ctz_imm = CTZ(abs_imm);
if (instruction->IsDiv()) {
@@ -2296,7 +2295,7 @@
// Do not generate anything. DivZeroCheck would prevent any code to be executed.
} else if (imm == 1 || imm == -1) {
DivRemOneOrMinusOne(instruction);
- } else if (IsPowerOfTwo(std::abs(imm))) {
+ } else if (IsPowerOfTwo(AbsOrMin(imm))) {
DivRemByPowerOfTwo(instruction);
} else {
DCHECK(imm <= -2 || imm >= 2);
diff --git a/compiler/optimizing/code_generator_mips64.cc b/compiler/optimizing/code_generator_mips64.cc
index 05834ff..d844173 100644
--- a/compiler/optimizing/code_generator_mips64.cc
+++ b/compiler/optimizing/code_generator_mips64.cc
@@ -1955,8 +1955,7 @@
GpuRegister out = locations->Out().AsRegister<GpuRegister>();
GpuRegister dividend = locations->InAt(0).AsRegister<GpuRegister>();
int64_t imm = Int64FromConstant(second.GetConstant());
- uint64_t abs_imm = static_cast<uint64_t>(std::abs(imm));
- DCHECK(IsPowerOfTwo(abs_imm));
+ uint64_t abs_imm = static_cast<uint64_t>(AbsOrMin(imm));
int ctz_imm = CTZ(abs_imm);
if (instruction->IsDiv()) {
@@ -2138,7 +2137,7 @@
// Do not generate anything. DivZeroCheck would prevent any code to be executed.
} else if (imm == 1 || imm == -1) {
DivRemOneOrMinusOne(instruction);
- } else if (IsPowerOfTwo(std::abs(imm))) {
+ } else if (IsPowerOfTwo(AbsOrMin(imm))) {
DivRemByPowerOfTwo(instruction);
} else {
DCHECK(imm <= -2 || imm >= 2);
diff --git a/compiler/optimizing/code_generator_x86.cc b/compiler/optimizing/code_generator_x86.cc
index fd18917..e236f0e 100644
--- a/compiler/optimizing/code_generator_x86.cc
+++ b/compiler/optimizing/code_generator_x86.cc
@@ -3219,11 +3219,12 @@
Register out_register = locations->Out().AsRegister<Register>();
Register input_register = locations->InAt(0).AsRegister<Register>();
int32_t imm = locations->InAt(1).GetConstant()->AsIntConstant()->GetValue();
+ DCHECK(IsPowerOfTwo(AbsOrMin(imm)));
+ uint32_t abs_imm = static_cast<uint32_t>(AbsOrMin(imm));
- DCHECK(IsPowerOfTwo(std::abs(imm)));
Register num = locations->GetTemp(0).AsRegister<Register>();
- __ leal(num, Address(input_register, std::abs(imm) - 1));
+ __ leal(num, Address(input_register, abs_imm - 1));
__ testl(input_register, input_register);
__ cmovl(kGreaterEqual, num, input_register);
int shift = CTZ(imm);
@@ -3336,7 +3337,7 @@
// Do not generate anything for 0. DivZeroCheck would forbid any generated code.
} else if (imm == 1 || imm == -1) {
DivRemOneOrMinusOne(instruction);
- } else if (is_div && IsPowerOfTwo(std::abs(imm))) {
+ } else if (is_div && IsPowerOfTwo(AbsOrMin(imm))) {
DivByPowerOfTwo(instruction->AsDiv());
} else {
DCHECK(imm <= -2 || imm >= 2);
diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index 7c94a8c..8b77ec4 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -3347,13 +3347,13 @@
CpuRegister numerator = locations->InAt(0).AsRegister<CpuRegister>();
int64_t imm = Int64FromConstant(second.GetConstant());
-
- DCHECK(IsPowerOfTwo(std::abs(imm)));
+ DCHECK(IsPowerOfTwo(AbsOrMin(imm)));
+ uint64_t abs_imm = AbsOrMin(imm);
CpuRegister tmp = locations->GetTemp(0).AsRegister<CpuRegister>();
if (instruction->GetResultType() == Primitive::kPrimInt) {
- __ leal(tmp, Address(numerator, std::abs(imm) - 1));
+ __ leal(tmp, Address(numerator, abs_imm - 1));
__ testl(numerator, numerator);
__ cmov(kGreaterEqual, tmp, numerator);
int shift = CTZ(imm);
@@ -3368,7 +3368,7 @@
DCHECK_EQ(instruction->GetResultType(), Primitive::kPrimLong);
CpuRegister rdx = locations->GetTemp(0).AsRegister<CpuRegister>();
- codegen_->Load64BitValue(rdx, std::abs(imm) - 1);
+ codegen_->Load64BitValue(rdx, abs_imm - 1);
__ addq(rdx, numerator);
__ testq(numerator, numerator);
__ cmov(kGreaterEqual, rdx, numerator);
@@ -3526,7 +3526,7 @@
// Do not generate anything. DivZeroCheck would prevent any code to be executed.
} else if (imm == 1 || imm == -1) {
DivRemOneOrMinusOne(instruction);
- } else if (instruction->IsDiv() && IsPowerOfTwo(std::abs(imm))) {
+ } else if (instruction->IsDiv() && IsPowerOfTwo(AbsOrMin(imm))) {
DivByPowerOfTwo(instruction->AsDiv());
} else {
DCHECK(imm <= -2 || imm >= 2);
diff --git a/runtime/utils.h b/runtime/utils.h
index a07e74c..3f94a80 100644
--- a/runtime/utils.h
+++ b/runtime/utils.h
@@ -99,6 +99,18 @@
return (ch < ' ' || ch > '~');
}
+template <typename T> T SafeAbs(T value) {
+ // std::abs has undefined behavior on min limits.
+ DCHECK_NE(value, std::numeric_limits<T>::min());
+ return std::abs(value);
+}
+
+template <typename T> T AbsOrMin(T value) {
+ return (value == std::numeric_limits<T>::min())
+ ? value
+ : std::abs(value);
+}
+
std::string PrintableChar(uint16_t ch);
// Returns an ASCII string corresponding to the given UTF-8 string.
diff --git a/test/561-divrem/expected.txt b/test/561-divrem/expected.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/561-divrem/expected.txt
diff --git a/test/561-divrem/info.txt b/test/561-divrem/info.txt
new file mode 100644
index 0000000..71c9601
--- /dev/null
+++ b/test/561-divrem/info.txt
@@ -0,0 +1,2 @@
+Regression test for div/rem taking Integer.MIN_VALUE and
+Long.MIN_VALUE.
diff --git a/test/561-divrem/src/Main.java b/test/561-divrem/src/Main.java
new file mode 100644
index 0000000..082783d
--- /dev/null
+++ b/test/561-divrem/src/Main.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class Main {
+ public static void assertEquals(int expected, int actual) {
+ if (expected != actual) {
+ throw new Error("Expected " + expected + ", got " + actual);
+ }
+ }
+
+ public static void assertEquals(long expected, long actual) {
+ if (expected != actual) {
+ throw new Error("Expected " + expected + ", got " + actual);
+ }
+ }
+
+ public static void main(String[] args) {
+ assertEquals(0, $noinline$divInt(1));
+ assertEquals(1, $noinline$remInt(1));
+
+ assertEquals(0, $noinline$divInt(-1));
+ assertEquals(-1, $noinline$remInt(-1));
+
+ assertEquals(0, $noinline$divInt(0));
+ assertEquals(0, $noinline$remInt(0));
+
+ assertEquals(1, $noinline$divInt(Integer.MIN_VALUE));
+ assertEquals(0, $noinline$remInt(Integer.MIN_VALUE));
+
+ assertEquals(0, $noinline$divInt(Integer.MAX_VALUE));
+ assertEquals(Integer.MAX_VALUE, $noinline$remInt(Integer.MAX_VALUE));
+
+ assertEquals(0, $noinline$divInt(Integer.MAX_VALUE - 1));
+ assertEquals(Integer.MAX_VALUE - 1, $noinline$remInt(Integer.MAX_VALUE - 1));
+
+ assertEquals(0, $noinline$divInt(Integer.MIN_VALUE + 1));
+ assertEquals(Integer.MIN_VALUE + 1, $noinline$remInt(Integer.MIN_VALUE + 1));
+
+ assertEquals(0L, $noinline$divLong(1L));
+ assertEquals(1L, $noinline$remLong(1L));
+
+ assertEquals(0L, $noinline$divLong(-1L));
+ assertEquals(-1L, $noinline$remLong(-1L));
+
+ assertEquals(0L, $noinline$divLong(0L));
+ assertEquals(0L, $noinline$remLong(0L));
+
+ assertEquals(1L, $noinline$divLong(Long.MIN_VALUE));
+ assertEquals(0L, $noinline$remLong(Long.MIN_VALUE));
+
+ assertEquals(0L, $noinline$divLong(Long.MAX_VALUE));
+ assertEquals(Long.MAX_VALUE, $noinline$remLong(Long.MAX_VALUE));
+
+ assertEquals(0L, $noinline$divLong(Long.MAX_VALUE - 1));
+ assertEquals(Long.MAX_VALUE - 1, $noinline$remLong(Long.MAX_VALUE - 1));
+
+ assertEquals(0L, $noinline$divLong(Integer.MIN_VALUE + 1));
+ assertEquals(Long.MIN_VALUE + 1, $noinline$remLong(Long.MIN_VALUE + 1));
+ }
+
+ public static int $noinline$divInt(int value) {
+ if (doThrow) {
+ throw new Error("");
+ }
+ return value / Integer.MIN_VALUE;
+ }
+
+ public static int $noinline$remInt(int value) {
+ if (doThrow) {
+ throw new Error("");
+ }
+ return value % Integer.MIN_VALUE;
+ }
+
+ public static long $noinline$divLong(long value) {
+ if (doThrow) {
+ throw new Error("");
+ }
+ return value / Long.MIN_VALUE;
+ }
+
+ public static long $noinline$remLong(long value) {
+ if (doThrow) {
+ throw new Error("");
+ }
+ return value % Long.MIN_VALUE;
+ }
+
+ static boolean doThrow = false;
+}
diff --git a/test/701-easy-div-rem/genMain.py b/test/701-easy-div-rem/genMain.py
index 75eee17..b6c769f 100644
--- a/test/701-easy-div-rem/genMain.py
+++ b/test/701-easy-div-rem/genMain.py
@@ -13,25 +13,27 @@
# limitations under the License.
upper_bound_int_pow2 = 31
+upper_bound_int_pow2_neg = 32
upper_bound_long_pow2 = 63
+upper_bound_long_pow2_neg = 64
upper_bound_constant = 100
all_tests = [
({'@INT@': 'int', '@SUFFIX@':''},
[('CheckDiv', 'idiv_by_pow2_', [2**i for i in range(upper_bound_int_pow2)]),
- ('CheckDiv', 'idiv_by_pow2_neg_', [-2**i for i in range(upper_bound_int_pow2)]),
+ ('CheckDiv', 'idiv_by_pow2_neg_', [-2**i for i in range(upper_bound_int_pow2_neg)]),
('CheckDiv', 'idiv_by_constant_', [i for i in range(1, upper_bound_constant)]),
('CheckDiv', 'idiv_by_constant_neg_', [-i for i in range(1, upper_bound_constant)]),
('CheckRem', 'irem_by_pow2_', [2**i for i in range(upper_bound_int_pow2)]),
- ('CheckRem', 'irem_by_pow2_neg_', [-2**i for i in range(upper_bound_int_pow2)]),
+ ('CheckRem', 'irem_by_pow2_neg_', [-2**i for i in range(upper_bound_int_pow2_neg)]),
('CheckRem', 'irem_by_constant_', [i for i in range(1, upper_bound_constant)]),
('CheckRem', 'irem_by_constant_neg_', [-i for i in range(1, upper_bound_constant)])]),
({'@INT@': 'long', '@SUFFIX@': 'l'},
[('CheckDiv', 'ldiv_by_pow2_', [2**i for i in range(upper_bound_long_pow2)]),
- ('CheckDiv', 'ldiv_by_pow2_neg_', [-2**i for i in range(upper_bound_long_pow2)]),
+ ('CheckDiv', 'ldiv_by_pow2_neg_', [-2**i for i in range(upper_bound_long_pow2_neg)]),
('CheckDiv', 'ldiv_by_constant_', [i for i in range(1, upper_bound_constant)]),
('CheckDiv', 'ldiv_by_constant_neg_', [-i for i in range(1, upper_bound_constant)]),
('CheckRem', 'lrem_by_pow2_', [2**i for i in range(upper_bound_long_pow2)]),
- ('CheckRem', 'lrem_by_pow2_neg_', [-2**i for i in range(upper_bound_long_pow2)]),
+ ('CheckRem', 'lrem_by_pow2_neg_', [-2**i for i in range(upper_bound_long_pow2_neg)]),
('CheckRem', 'lrem_by_constant_', [i for i in range(1, upper_bound_constant)]),
('CheckRem', 'lrem_by_constant_neg_', [-i for i in range(1, upper_bound_constant)])])
]
