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deps: V8: backport 3f071e3e7e15
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Original commit message:

    PPC: Optimize clearing higher bits of mulhw/mulhwu

    Change-Id: Ie3e14a6ef4531349e81a8ae741bc7470c7e547ca
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2349468
    Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
    Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
    Cr-Commit-Position: refs/heads/master@{#69343}

Refs: v8/v8@3f071e3

Backport-PR-URL: #35305
PR-URL: #35305
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ash Cripps <acripps@redhat.com>
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miladfarca authored and addaleax committed Sep 23, 2020
1 parent 57564eb commit e9e3390
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Showing 2 changed files with 7 additions and 5 deletions.
2 changes: 1 addition & 1 deletion common.gypi
Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@

# Reset this number to 0 on major V8 upgrades.
# Increment by one for each non-official patch applied to deps/v8.
'v8_embedder_string': '-node.41',
'v8_embedder_string': '-node.42',

##### V8 defaults for Node.js #####

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10 changes: 6 additions & 4 deletions deps/v8/src/compiler/backend/ppc/code-generator-ppc.cc
Original file line number Diff line number Diff line change
Expand Up @@ -1480,12 +1480,14 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
}
break;
case kPPC_MulHigh32:
__ mulhw(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1),
i.OutputRCBit());
__ mulhw(r0, i.InputRegister(0), i.InputRegister(1), i.OutputRCBit());
// High 32 bits are undefined and need to be cleared.
__ clrldi(i.OutputRegister(), r0, Operand(32));
break;
case kPPC_MulHighU32:
__ mulhwu(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1),
i.OutputRCBit());
__ mulhwu(r0, i.InputRegister(0), i.InputRegister(1), i.OutputRCBit());
// High 32 bits are undefined and need to be cleared.
__ clrldi(i.OutputRegister(), r0, Operand(32));
break;
case kPPC_MulDouble:
ASSEMBLE_FLOAT_BINOP_RC(fmul, MiscField::decode(instr->opcode()));
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