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bug #1636: fix gemm performance issue with gcc>=6 and no FMA

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(grafted from 4e7746fe2234ccaa10cb0c9431d68ee72a1d1d40
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This commit is contained in:
Gael Guennebaud 2018-12-07 09:15:46 +01:00
parent c4ea9a916f
commit 9d56215db8
1 changed files with 10 additions and 2 deletions
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12
Eigen/src/Core/products/GeneralBlockPanelKernel.h
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@ -1197,10 +1197,18 @@ void gebp_kernel<LhsScalar,RhsScalar,Index,DataMapper,mr,nr,ConjugateLhs,Conjuga
EIGEN_ASM_COMMENT("begin gebp micro kernel 2pX4"); EIGEN_ASM_COMMENT("begin gebp micro kernel 2pX4");
RhsPacket B_0, B1, B2, B3, T0; RhsPacket B_0, B1, B2, B3, T0;
#define EIGEN_GEBGP_ONESTEP(K) \
// NOTE: the begin/end asm comments below work around bug 935!
// but they are not enough for gcc>=6 without FMA (bug 1637)
#if EIGEN_GNUC_AT_LEAST(6,0)
#define EIGEN_GEBP_2PX4_SPILLING_WORKAROUND asm("" : [a0] "+x" (A0), [a1] "+x" (A1) );
#else
#define EIGEN_GEBP_2PX4_SPILLING_WORKAROUND
#endif
#define EIGEN_GEBGP_ONESTEP(K) \
do { \ do { \
EIGEN_ASM_COMMENT("begin step of gebp micro kernel 2pX4"); \ EIGEN_ASM_COMMENT("begin step of gebp micro kernel 2pX4"); \
EIGEN_ASM_COMMENT("Note: these asm comments work around bug 935!"); \ EIGEN_GEBP_2PX4_SPILLING_WORKAROUND \
traits.loadLhs(&blA[(0+2*K)*LhsProgress], A0); \ traits.loadLhs(&blA[(0+2*K)*LhsProgress], A0); \
traits.loadLhs(&blA[(1+2*K)*LhsProgress], A1); \ traits.loadLhs(&blA[(1+2*K)*LhsProgress], A1); \
traits.broadcastRhs(&blB[(0+4*K)*RhsProgress], B_0, B1, B2, B3); \ traits.broadcastRhs(&blB[(0+4*K)*RhsProgress], B_0, B1, B2, B3); \