runtime/vm/intrinsifier_mips.cc - Issue 1124173002: Implement Smi_bitLength intrinsic on mips, arm, and arm64.

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Unified Diff: runtime/vm/intrinsifier_mips.cc

Issue 1124173002: Implement Smi_bitLength intrinsic on mips, arm, and arm64. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/

Patch Set: Created 5 years, 7 months ago

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Index: runtime/vm/intrinsifier_mips.cc

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

--- runtime/vm/intrinsifier_mips.cc (revision 45551)

+++ runtime/vm/intrinsifier_mips.cc (working copy)

@@ -788,7 +788,16 @@

void Intrinsifier::Smi_bitLength(Assembler* assembler) {

- // TODO(sra): Implement.

+ __ lw(V0, Address(SP, 0 * kWordSize));

+ __ SmiUntag(V0);

+ // XOR with sign bit to complement bits if value is negative.

+ __ sra(T0, V0, 31);

+ __ xor_(V0, V0, T0);

+ __ clz(V0, V0);

+ __ LoadImmediate(T0, 32);

+ __ subu(V0, T0, V0);

+ __ Ret();

+ __ delay_slot()->SmiTag(V0);

}

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