Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(135)

Unified Diff: src/compiler/x64/instruction-selector-x64.cc

Issue 1405453003: CTZ instruction implemented as optional operator. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Fixed a bug when bmi1=false Created 5 years, 2 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
« no previous file with comments | « src/compiler/x64/instruction-codes-x64.h ('k') | src/compiler/x87/instruction-selector-x87.cc » ('j') | no next file with comments »
Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index 516a9a7691ca0d7c2ba9c33a47857bc07dec48e3..3cff64be727f014e5f79ca990b345f077b080613 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -578,6 +578,12 @@ void InstructionSelector::VisitWord32Clz(Node* node) {
}
+void InstructionSelector::VisitWord32Ctz(Node* node) {
+ X64OperandGenerator g(this);
+ Emit(kX64Tzcnt32, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
void InstructionSelector::VisitInt32Add(Node* node) {
X64OperandGenerator g(this);
@@ -1704,7 +1710,8 @@ InstructionSelector::SupportedMachineOperatorFlags() {
MachineOperatorBuilder::kFloat32Min |
MachineOperatorBuilder::kFloat64Max |
MachineOperatorBuilder::kFloat64Min |
- MachineOperatorBuilder::kWord32ShiftIsSafe;
+ MachineOperatorBuilder::kWord32ShiftIsSafe |
+ MachineOperatorBuilder::kWord32Ctz;
if (CpuFeatures::IsSupported(SSE4_1)) {
flags |= MachineOperatorBuilder::kFloat64RoundDown |
MachineOperatorBuilder::kFloat64RoundTruncate;
« no previous file with comments | « src/compiler/x64/instruction-codes-x64.h ('k') | src/compiler/x87/instruction-selector-x87.cc » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698