Mercurial > hg > graal-jvmci-8
changeset 3930:da6a29fb0da5
7054211: No loop unrolling done in jdk7b144 for a test update() while loop
Summary: restore unrolling code for CaffeineMark.
Reviewed-by: never
author | kvn |
---|---|
date | Wed, 07 Sep 2011 12:58:42 -0700 |
parents | c2d3caa64b3e |
children | 5432047c7db7 |
files | src/share/vm/opto/loopTransform.cpp |
diffstat | 1 files changed, 5 insertions(+), 1 deletions(-) [+] |
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--- a/src/share/vm/opto/loopTransform.cpp Wed Sep 07 09:35:52 2011 +0200 +++ b/src/share/vm/opto/loopTransform.cpp Wed Sep 07 12:58:42 2011 -0700 @@ -709,10 +709,13 @@ // Adjust body_size to determine if we unroll or not uint body_size = _body.size(); + // Key test to unroll loop in CRC32 java code + int xors_in_loop = 0; // Also count ModL, DivL and MulL which expand mightly for (uint k = 0; k < _body.size(); k++) { Node* n = _body.at(k); switch (n->Opcode()) { + case Op_XorI: xors_in_loop++; break; // CRC32 java code case Op_ModL: body_size += 30; break; case Op_DivL: body_size += 30; break; case Op_MulL: body_size += 10; break; @@ -729,7 +732,8 @@ // Check for being too big if (body_size > (uint)LoopUnrollLimit) { - // Normal case: loop too big + if (xors_in_loop >= 4 && body_size < (uint)LoopUnrollLimit*4) return true; + // Normal case: loop too big return false; }