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Unified Diff: runtime/vm/intermediate_language_arm64.cc

Issue 425083003: Use (more) xor on FP register to load it with 0.0. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 6 years, 5 months ago
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Index: runtime/vm/intermediate_language_arm64.cc
===================================================================
--- runtime/vm/intermediate_language_arm64.cc (revision 38628)
+++ runtime/vm/intermediate_language_arm64.cc (working copy)
@@ -296,8 +296,13 @@
void UnboxedConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
if (!locs()->out(0).IsInvalid()) {
- const VRegister dst = locs()->out(0).fpu_reg();
- __ LoadDImmediate(dst, Double::Cast(value()).value(), PP);
+ if (Utils::DoublesBitEqual(Double::Cast(value()).value(), 0.0)) {
+ const VRegister dst = locs()->out(0).fpu_reg();
+ __ veor(dst, dst, dst);
+ } else {
+ const VRegister dst = locs()->out(0).fpu_reg();
+ __ LoadDImmediate(dst, Double::Cast(value()).value(), PP);
+ }
}
}
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