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diff src/cpu/x86/vm/macroAssembler_x86.cpp @ 17922:400709e275c1

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8029302: Performance regression in Math.pow intrinsic Summary: Added special case for x^y where y == 2 Reviewed-by: kvn
author adlertz
date Fri, 25 Apr 2014 12:48:34 +0200
parents 526acaf3626f
children 78bbf4d43a14
line wrap: on
line diff
--- a/src/cpu/x86/vm/macroAssembler_x86.cpp	Thu May 08 23:10:23 2014 -0700
+++ b/src/cpu/x86/vm/macroAssembler_x86.cpp	Fri Apr 25 12:48:34 2014 +0200
@@ -3152,10 +3152,12 @@
   // if fast computation is not possible, result is NaN. Requires
   // fallback from user of this macro.
   // increase precision for intermediate steps of the computation
+  BLOCK_COMMENT("fast_pow {");
   increase_precision();
   fyl2x();                 // Stack: (Y*log2(X)) ...
   pow_exp_core_encoding(); // Stack: exp(X) ...
   restore_precision();
+  BLOCK_COMMENT("} fast_pow");
 }
 
 void MacroAssembler::fast_exp() {