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[arm] Change fp_fixed registers to be allocatable registers

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fp_fixed1 and fp_fixed2 are used by the S8x16Shuffle operation. They
need to be allocatable, so that they can be correctly marked as fixed
and spilled as required. The previous value of fp_fixed2, d29, is not in
the list of allocatable double registers, and not marked as fixed
appropriately.

One fix could be to extend the list of allocatable double registers, but
there is a comment there saying that the list is kept even-length to
make stack alignment easier. So rather than messing with that, we
instead change what fp_fixed1 and fp_fixed2 is, since S8x16Shuffle is
the only user, this is a simpler change.

Bug: chromium:1070078
Change-Id: Id7de9b256bad2cfb11b0f06b66eb80a48ff7827c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2161565
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67372}
This commit is contained in:
Ng Zhi An 2020-04-22 10:16:11 -07:00 committed by Commit Bot
parent 00604cd280
commit 390ed4b934
3 changed files with 47 additions and 2 deletions
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5
src/codegen/arm64/register-arm64.h
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@ -470,8 +470,9 @@ ALIAS_REGISTER(Register, padreg, x31);
// Keeps the 0 double value.
ALIAS_REGISTER(VRegister, fp_zero, d15);
// MacroAssembler fixed V Registers.
ALIAS_REGISTER(VRegister, fp_fixed1, d28);
ALIAS_REGISTER(VRegister, fp_fixed2, d29);
// d29 is not part of ALLOCATABLE_DOUBLE_REGISTERS, so use 27 and 28.
ALIAS_REGISTER(VRegister, fp_fixed1, d27);
ALIAS_REGISTER(VRegister, fp_fixed2, d28);
// MacroAssembler scratch V registers.
ALIAS_REGISTER(VRegister, fp_scratch, d30);

39
test/mjsunit/regress/wasm/regress-1070078.js Normal file
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@ -0,0 +1,39 @@
// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --experimental-wasm-simd
load('test/mjsunit/wasm/wasm-module-builder.js');
const builder = new WasmModuleBuilder();
builder.addMemory(16, 32, false);
builder.addType(makeSig([kWasmI32, kWasmI32, kWasmI32], [kWasmI32]));
// Generate function 1 (out of 4).
builder.addFunction(undefined, 0 /* sig */).addBodyWithEnd([
// signature: i_iii
// body:
kExprI32Const, 0x00, // i32.const
kExprMemoryGrow, 0x00, // memory.grow
kExprI32Const, 0xd3, 0xe7, 0x03, // i32.const
kSimdPrefix, kExprI8x16Splat, // i8x16.splat
kExprI32Const, 0x84, 0x80, 0xc0, 0x05, // i32.const
kSimdPrefix, kExprI8x16Splat, // i8x16.splat
kExprI32Const, 0x84, 0x81, 0x80, 0xc8, 0x01, // i32.const
kSimdPrefix, kExprI8x16Splat, // i8x16.splat
kExprI32Const, 0x19, // i32.const
kSimdPrefix, kExprI8x16Splat, // i8x16.splat
kSimdPrefix, kExprS8x16Shuffle,
0x00, 0x00, 0x17, 0x00, 0x04, 0x04, 0x04, 0x04,
0x04, 0x10, 0x01, 0x00, 0x04, 0x04, 0x04, 0x04, // s8x16.shuffle
kSimdPrefix, kExprS8x16Shuffle,
0x04, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // s8x16.shuffle
kSimdPrefix, kExprI16x8LeU, // i16x8.le_u
kSimdPrefix, kExprS1x4AnyTrue, // s1x4.any_true
kExprMemoryGrow, 0x00, // memory.grow
kExprDrop,
kExprEnd, // end @233
]);
builder.addExport('main', 0);
builder.instantiate();

5
test/mjsunit/wasm/wasm-module-builder.js
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@ -469,14 +469,19 @@ let kExprI64AtomicCompareExchange32U = 0x4e;
// Simd opcodes.
let kExprS128LoadMem = 0x00;
let kExprS128StoreMem = 0x01;
let kExprS8x16Shuffle = 0x03;
let kExprI8x16Splat = 0x04;
let kExprI16x8Splat = 0x08;
let kExprI32x4Splat = 0x0c;
let kExprF32x4Splat = 0x12;
let kExprI8x16LtU = 0x1b;
let kExprI16x8LeU = 0x29;
let kExprI32x4Eq = 0x2c;
let kExprS1x16AnyTrue = 0x52;
let kExprS1x8AnyTrue = 0x63;
let kExprI16x8ShrS = 0x66;
let kExprS1x4AllTrue = 0x75;
let kExprS1x4AnyTrue = 0x74;
let kExprI32x4Add = 0x79;
let kExprF32x4Min = 0x9e;
let kExprS8x16LoadSplat = [0xc2, 0x1];