diff options
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp index 4003b1b0812..e1d46f72542 100644 --- a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp +++ b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp @@ -226,6 +226,12 @@ unsigned PPCTTIImpl::getMaxInterleaveFactor() { if (Directive == PPC::DIR_E500mc || Directive == PPC::DIR_E5500) return 1; + // For P7 and P8, floating-point instructions have a 6-cycle latency and + // there are two execution units, so unroll by 12x for latency hiding. + if (Directive == PPC::DIR_PWR7 || + Directive == PPC::DIR_PWR8) + return 12; + // For most things, modern systems have two execution units (and // out-of-order execution). return 2; |
