commit e384547851a9d9e5d89ae5bb4c16bfd7d93cc12e
author Chris Larsen <chris.larsen@imgtec.com> Wed Nov 18 12:27:15 2015 -0800
committer Chris Larsen <chris.larsen@imgtec.com> Mon Nov 30 17:27:36 2015 -0800
tree 41ba461c62b6a89253b59117a68beae05df5006f
parent 70014c8af8d3a20c2987c308788bc86671bc39e9

MIPS32: int java.lang.*.numberOfLeadingZeros

- int java.lang.Integer.numberOfLeadingZeros(int)
- int java.lang.Long.numberOfLeadingZeros(long)

Change-Id: Icaf746cb807863f944ff4ebb5da6e6b2846eac58

compiler/optimizing/intrinsics_mips.cc

diff --git a/compiler/optimizing/intrinsics_mips.cc b/compiler/optimizing/intrinsics_mips.cc
index 9f16462..a974739 100644
--- a/compiler/optimizing/intrinsics_mips.cc
+++ b/compiler/optimizing/intrinsics_mips.cc
@@ -426,6 +426,60 @@
              GetAssembler());
 }
 
+static void GenNumberOfLeadingZeroes(LocationSummary* locations,
+                                     bool is64bit,
+                                     bool isR6,
+                                     MipsAssembler* assembler) {
+  Register out = locations->Out().AsRegister<Register>();
+  if (is64bit) {
+    Register in_lo = locations->InAt(0).AsRegisterPairLow<Register>();
+    Register in_hi = locations->InAt(0).AsRegisterPairHigh<Register>();
+
+    if (isR6) {
+      __ ClzR6(AT, in_hi);
+      __ ClzR6(TMP, in_lo);
+      __ Seleqz(TMP, TMP, in_hi);
+    } else {
+      __ ClzR2(AT, in_hi);
+      __ ClzR2(TMP, in_lo);
+      __ Movn(TMP, ZERO, in_hi);
+    }
+    __ Addu(out, AT, TMP);
+  } else {
+    Register in = locations->InAt(0).AsRegister<Register>();
+
+    if (isR6) {
+      __ ClzR6(out, in);
+    } else {
+      __ ClzR2(out, in);
+    }
+  }
+}
+
+// int java.lang.Integer.numberOfLeadingZeros(int i)
+void IntrinsicLocationsBuilderMIPS::VisitIntegerNumberOfLeadingZeros(HInvoke* invoke) {
+  CreateIntToIntLocations(arena_, invoke);
+}
+
+void IntrinsicCodeGeneratorMIPS::VisitIntegerNumberOfLeadingZeros(HInvoke* invoke) {
+  GenNumberOfLeadingZeroes(invoke->GetLocations(),
+                           false,
+                           codegen_->GetInstructionSetFeatures().IsR6(),
+                           GetAssembler());
+}
+
+// int java.lang.Long.numberOfLeadingZeros(long i)
+void IntrinsicLocationsBuilderMIPS::VisitLongNumberOfLeadingZeros(HInvoke* invoke) {
+  CreateIntToIntLocations(arena_, invoke);
+}
+
+void IntrinsicCodeGeneratorMIPS::VisitLongNumberOfLeadingZeros(HInvoke* invoke) {
+  GenNumberOfLeadingZeroes(invoke->GetLocations(),
+                           true,
+                           codegen_->GetInstructionSetFeatures().IsR6(),
+                           GetAssembler());
+}
+
 // int java.lang.Integer.reverse(int)
 void IntrinsicLocationsBuilderMIPS::VisitIntegerReverse(HInvoke* invoke) {
   CreateIntToIntLocations(arena_, invoke);
@@ -564,8 +618,6 @@
 void IntrinsicCodeGeneratorMIPS::Visit ## Name(HInvoke* invoke ATTRIBUTE_UNUSED) {    \
 }
 
-UNIMPLEMENTED_INTRINSIC(LongNumberOfLeadingZeros)
-UNIMPLEMENTED_INTRINSIC(IntegerNumberOfLeadingZeros)
 UNIMPLEMENTED_INTRINSIC(MathAbsDouble)
 UNIMPLEMENTED_INTRINSIC(MathAbsFloat)
 UNIMPLEMENTED_INTRINSIC(MathAbsInt)