src/x64/assembler-x64.cc - Issue 9378006: Make sure that top bits are zero when storing untagged 32 bit values

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Unified Diff: src/x64/assembler-x64.cc

Issue 9378006: Make sure that top bits are zero when storing untagged 32 bit values (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/

Patch Set: '' Created 8 years, 10 months ago

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Index: src/x64/assembler-x64.cc

===================================================================

--- src/x64/assembler-x64.cc (revision 10650)

+++ src/x64/assembler-x64.cc (working copy)

@@ -1640,6 +1640,8 @@

void Assembler::movzxbq(Register dst, const Operand& src) {

EnsureSpace ensure_space(this);

+ // 32 bit operations zero the top 32 bits of 64 bit registers. Therefore

+ // there is no need to make this a 64 bit operation.

emit_optional_rex_32(dst, src);

emit(0x0F);

emit(0xB6);

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