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8038297: Avoid placing CTI immediately following cbcond instruction on T4

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Insert a nop between cbcond and CTI

Reviewed-by: kvn, twisti
This commit is contained in:
Igor Veresov 2014-04-10 23:15:13 -07:00
parent b3c9d243d3
commit e6456ff2a4
8 changed files with 125 additions and 65 deletions
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10
hotspot/src/cpu/sparc/vm/assembler_sparc.hpp
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@ -630,11 +630,20 @@ class Assembler : public AbstractAssembler {
}
protected:
// Insert a nop if the previous is cbcond
void insert_nop_after_cbcond() {
if (UseCBCond && cbcond_before()) {
nop();
}
}
// Delay slot helpers
// cti is called when emitting control-transfer instruction,
// BEFORE doing the emitting.
// Only effective when assertion-checking is enabled.
void cti() {
// A cbcond instruction immediately followed by a CTI
// instruction introduces pipeline stalls, we need to avoid that.
no_cbcond_before();
#ifdef CHECK_DELAY
assert_not_delayed("cti should not be in delay slot");
#endif
@ -658,7 +667,6 @@ class Assembler : public AbstractAssembler {
void no_cbcond_before() {
assert(offset() == 0 || !cbcond_before(), "cbcond should not follow an other cbcond");
}
public:
bool use_cbcond(Label& L) {