[SystemZ::TTI] Improve accuracy of costs for vector fp <-> int conversions
Improve getCastInstrCost() by respecting the different types of Src and Dst
for vector integer <-> fp conversions.
This means that extracting from integer becomes more expensive (by the
extraction penalty), and the extraction from fp becomes cheaper (no longer
has a false extraction penalty).
Review: Ulrich Weigand
https://reviews.llvm.org/D54423
llvm-svn: 346663
diff --git a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
index f296d80..b25059e 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
@@ -718,7 +718,8 @@
(Opcode == Instruction::FPToSI || Opcode == Instruction::FPToUI))
NeedsExtracts = false;
- TotCost += getScalarizationOverhead(Dst, NeedsInserts, NeedsExtracts);
+ TotCost += getScalarizationOverhead(Src, false, NeedsExtracts);
+ TotCost += getScalarizationOverhead(Dst, NeedsInserts, false);
// FIXME: VF 2 for float<->i32 is currently just as expensive as for VF 4.
if (VF == 2 && SrcScalarBits == 32 && DstScalarBits == 32)