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diff src/cpu/x86/vm/assembler_x86.hpp @ 23050:e8260b6328fb

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8068945: Use RBP register as proper frame pointer in JIT compiled code on x86 Summary: Introduce the PreserveFramePointer flag to control if RBP is used as the frame pointer or as a general purpose register. Reviewed-by: kvn, roland, dlong, enevill, shade
author zmajo
date Fri, 29 May 2015 10:58:45 +0200
parents 166d744df0de
children dd9cc155639c daaf806995b3
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line diff
--- a/src/cpu/x86/vm/assembler_x86.hpp	Fri Mar 27 10:57:42 2015 +0100
+++ b/src/cpu/x86/vm/assembler_x86.hpp	Fri May 29 10:58:45 2015 +0200
@@ -141,8 +141,10 @@
 
 #endif // _LP64
 
-// JSR 292 fixed register usages:
-REGISTER_DECLARATION(Register, rbp_mh_SP_save, rbp);
+// JSR 292
+// On x86, the SP does not have to be saved when invoking method handle intrinsics
+// or compiled lambda forms. We indicate that by setting rbp_mh_SP_save to noreg.
+REGISTER_DECLARATION(Register, rbp_mh_SP_save, noreg);
 
 // Address is an abstraction used to represent a memory location
 // using any of the amd64 addressing modes with one object.