runtime/vm/intrinsifier_arm64.cc - Issue 1124173002: Implement Smi_bitLength intrinsic on mips, arm, and arm64.

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Unified Diff: runtime/vm/intrinsifier_arm64.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_arm64.cc

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

--- runtime/vm/intrinsifier_arm64.cc (revision 45551)

+++ runtime/vm/intrinsifier_arm64.cc (working copy)

@@ -692,7 +692,15 @@

void Intrinsifier::Smi_bitLength(Assembler* assembler) {

- // TODO(sra): Implement as word-length - CLZ.

+ __ ldr(R0, Address(SP, 0 * kWordSize));

+ __ SmiUntag(R0);

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

+ __ eor(R0, R0, Operand(R0, ASR, 63));

+ __ clz(R0, R0);

+ __ LoadImmediate(R1, 64, kNoPP);

+ __ sub(R0, R1, Operand(R0));

+ __ SmiTag(R0);

+ __ ret();

}

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