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Fix for suspected Intel 2018.1 compiler bug under O3

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This commit is contained in:
Peter Boyle 2019-07-19 07:57:34 +01:00
parent 0fd2827d5d
commit 775eaee199
1 changed files with 7 additions and 4 deletions
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11
Grid/lattice/Lattice_rng.h
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@ -163,13 +163,16 @@ public:
//
/////////////////////////////////////////////////////////////////////////////////////
// uint64_t skip = site+1; // Old init Skipped then drew. Checked compat with faster init
const int shift = 30;
const int shift = 30;
uint64_t skip = site;
////////////////////////////////////////////////////////////////////
// Weird compiler bug in Intel 2018.1 under O3 was generating 32bit and not 64 bit left shift.
////////////////////////////////////////////////////////////////////
volatile uint64_t skip = site;
skip = skip<<shift;
skip = skip<<shift;
assert((skip >> shift)==site); // check for overflow
assert((skip >> shift)==site); // check for overflow
eng.discard(skip);
// std::cout << " Engine " <<site << " state " <<eng<<std::endl;