Revision: 16707
Author: [email protected]
Date: Fri Sep 13 09:13:58 2013 UTC
Log: ARM: Improve SeqStringSetChar implementation.
TEST=/test/mjsunit/lithium/SeqStringSetChar.js
[email protected]
Review URL: https://codereview.chromium.org/23890007
Patch from Rodolph Perfetta <[email protected]>.
http://code.google.com/p/v8/source/detail?r=16707
Added:
/branches/bleeding_edge/test/mjsunit/lithium/SeqStringSetChar.js
Modified:
/branches/bleeding_edge/src/arm/lithium-arm.cc
/branches/bleeding_edge/src/arm/lithium-codegen-arm.cc
=======================================
--- /dev/null
+++ /branches/bleeding_edge/test/mjsunit/lithium/SeqStringSetChar.js Fri
Sep 13 09:13:58 2013 UTC
@@ -0,0 +1,46 @@
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax
+
+function MyStringFromCharCode(code, i) {
+ var one_byte = %NewString(3, true);
+ %_OneByteSeqStringSetChar(one_byte, 0, code);
+ %_OneByteSeqStringSetChar(one_byte, 1, code);
+ %_OneByteSeqStringSetChar(one_byte, i, code);
+ var two_byte = %NewString(3, false);
+ %_TwoByteSeqStringSetChar(two_byte, 0, code);
+ %_TwoByteSeqStringSetChar(two_byte, 1, code);
+ %_TwoByteSeqStringSetChar(two_byte, i, code);
+ return one_byte + two_byte;
+}
+
+MyStringFromCharCode(65, 2);
+var r1 = MyStringFromCharCode(65, 2);
+%OptimizeFunctionOnNextCall(MyStringFromCharCode);
+var r2 = MyStringFromCharCode(65, 2);
+assertEquals(r1, r2);
=======================================
--- /branches/bleeding_edge/src/arm/lithium-arm.cc Thu Sep 12 12:12:01 2013
UTC
+++ /branches/bleeding_edge/src/arm/lithium-arm.cc Fri Sep 13 09:13:58 2013
UTC
@@ -1883,11 +1883,9 @@
LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
LOperand* string = UseRegister(instr->string());
- LOperand* index = UseRegister(instr->index());
- LOperand* value = UseTempRegister(instr->value());
- LSeqStringSetChar* result =
- new(zone()) LSeqStringSetChar(instr->encoding(), string, index,
value);
- return DefineAsRegister(result);
+ LOperand* index = UseRegisterOrConstant(instr->index());
+ LOperand* value = UseRegister(instr->value());
+ return new(zone()) LSeqStringSetChar(instr->encoding(), string, index,
value);
}
=======================================
--- /branches/bleeding_edge/src/arm/lithium-codegen-arm.cc Thu Sep 12
12:12:01 2013 UTC
+++ /branches/bleeding_edge/src/arm/lithium-codegen-arm.cc Fri Sep 13
09:13:58 2013 UTC
@@ -1975,32 +1975,42 @@
void LCodeGen::DoSeqStringSetChar(LSeqStringSetChar* instr) {
Register string = ToRegister(instr->string());
- Register index = ToRegister(instr->index());
+ LOperand* index_op = instr->index();
Register value = ToRegister(instr->value());
+ Register scratch = scratch0();
String::Encoding encoding = instr->encoding();
if (FLAG_debug_code) {
- __ ldr(ip, FieldMemOperand(string, HeapObject::kMapOffset));
- __ ldrb(ip, FieldMemOperand(ip, Map::kInstanceTypeOffset));
+ __ ldr(scratch, FieldMemOperand(string, HeapObject::kMapOffset));
+ __ ldrb(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
- __ and_(ip, ip, Operand(kStringRepresentationMask |
kStringEncodingMask));
+ __ and_(scratch, scratch,
+ Operand(kStringRepresentationMask | kStringEncodingMask));
static const uint32_t one_byte_seq_type = kSeqStringTag |
kOneByteStringTag;
static const uint32_t two_byte_seq_type = kSeqStringTag |
kTwoByteStringTag;
- __ cmp(ip, Operand(encoding == String::ONE_BYTE_ENCODING
- ? one_byte_seq_type : two_byte_seq_type));
+ __ cmp(scratch, Operand(encoding == String::ONE_BYTE_ENCODING
+ ? one_byte_seq_type : two_byte_seq_type));
__ Check(eq, kUnexpectedStringType);
}
- __ add(ip,
- string,
- Operand(SeqString::kHeaderSize - kHeapObjectTag));
- if (encoding == String::ONE_BYTE_ENCODING) {
- __ strb(value, MemOperand(ip, index));
+ if (index_op->IsConstantOperand()) {
+ int constant_index = ToInteger32(LConstantOperand::cast(index_op));
+ if (encoding == String::ONE_BYTE_ENCODING) {
+ __ strb(value,
+ FieldMemOperand(string, SeqString::kHeaderSize +
constant_index));
+ } else {
+ __ strh(value,
+ FieldMemOperand(string, SeqString::kHeaderSize + constant_index
* 2));
+ }
} else {
- // MemOperand with ip as the base register is not allowed for strh, so
- // we do the address calculation explicitly.
- __ add(ip, ip, Operand(index, LSL, 1));
- __ strh(value, MemOperand(ip));
+ Register index = ToRegister(index_op);
+ if (encoding == String::ONE_BYTE_ENCODING) {
+ __ add(scratch, string, Operand(index));
+ __ strb(value, FieldMemOperand(scratch, SeqString::kHeaderSize));
+ } else {
+ __ add(scratch, string, Operand(index, LSL, 1));
+ __ strh(value, FieldMemOperand(scratch, SeqString::kHeaderSize));
+ }
}
}
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