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6747051: Improve code and implicit null check generation for compressed oops

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Push DecodeN node below the Null check to the non-null path to use the mach node without 0 test.

Reviewed-by: rasbold, never
This commit is contained in:
Vladimir Kozlov 2008-09-23 12:29:06 -07:00
parent 4b1e242299
commit b15796424e
6 changed files with 209 additions and 32 deletions
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3
hotspot/src/share/vm/asm/assembler.cpp
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@ -249,8 +249,6 @@ void AbstractAssembler::block_comment(const char* comment) {
bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {
// Exception handler checks the nmethod's implicit null checks table
// only when this method returns false.
#ifndef SPARC
// Sparc does not have based addressing
if (UseCompressedOops) {
// The first page after heap_base is unmapped and
// the 'offset' is equal to [heap_base + offset] for
@ -261,7 +259,6 @@ bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {
offset = (intptr_t)(pointer_delta((void*)offset, (void*)heap_base, 1));
}
}
#endif // SPARC
return offset < 0 || os::vm_page_size() <= offset;
}