Don't emit address size prefixes for native x86-64 ABI.

Address size prefixes are used in 64-bit x86 for PNaCl's use of the x32 ABI with ILP32 data model. Don't emit them for any other ABI. BUG=swiftshader:9 Change-Id: I1351db086d44ce4b144b3428866a54e84637b9a4 Reviewed-on: https://chromium-review.googlesource.com/390409Reviewed-by: Jim Stichnoth <stichnot@chromium.org> Tested-by: Nicolas Capens <nicolascapens@google.com>

Don't emit address size prefixes for native x86-64 ABI.
f53580b0 · Nicolas Capens · Nicolas Capens · fe93fdd5 · f53580b0
Commit f53580b0 authored Sep 28, 2016 by Nicolas Capens Committed by Nicolas Capens Sep 29, 2016
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IceTargetLoweringX8664.h src/IceTargetLoweringX8664.h +3 -1

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--- a/src/IceTargetLoweringX8664.h
+++ b/src/IceTargetLoweringX8664.h
@@ -42,7 +42,9 @@ public:
  }
  std::unique_ptr<::Ice::Assembler> createAssembler() const override {
-    const bool EmitAddrSizeOverridePrefix = !NeedSandboxing;
+    const bool EmitAddrSizeOverridePrefix =
+        !NeedSandboxing &&
+        getFlags().getApplicationBinaryInterface() == ABI_PNaCl;
    return makeUnique<X8664::AssemblerX8664>(EmitAddrSizeOverridePrefix);
  }