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[SystemZ] Fix the cost function for vector zero extend. 

Zero extend of a vector is done with either a single unpack or a vector
permute, and the TTI cost function should reflect this.

Review: Ulrich Weigand
This commit is contained in:
Jonas Paulsson 2020-08-31 16:35:39 +02:00
parent e6ccb57bb3
commit bfca9a0b99
2 changed files with 23 additions and 19 deletions
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6
llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
View File

@ -818,7 +818,11 @@ InstructionCost SystemZTTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst,
if (Opcode == Instruction::ZExt || Opcode == Instruction::SExt) {
if (SrcScalarBits >= 8) {
// ZExt/SExt will be handled with one unpack per doubling of width.
// ZExt will use either a single unpack or a vector permute.
if (Opcode == Instruction::ZExt)
return NumDstVectors;
// SExt will be handled with one unpack per doubling of width.
unsigned NumUnpacks = getElSizeLog2Diff(Src, Dst);
// For types that spans multiple vector registers, some additional

36
llvm/test/Analysis/CostModel/SystemZ/int-cast.ll
View File

@ -105,29 +105,29 @@ define void @zext() {
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v4 = zext i16 undef to i64
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v5 = zext i32 undef to i64
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v6 = zext <2 x i8> undef to <2 x i16>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v7 = zext <2 x i8> undef to <2 x i32>
; CHECK: Cost Model: Found an estimated cost of 3 for instruction: %v8 = zext <2 x i8> undef to <2 x i64>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v7 = zext <2 x i8> undef to <2 x i32>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v8 = zext <2 x i8> undef to <2 x i64>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v9 = zext <2 x i16> undef to <2 x i32>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v10 = zext <2 x i16> undef to <2 x i64>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v10 = zext <2 x i16> undef to <2 x i64>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v11 = zext <2 x i32> undef to <2 x i64>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v12 = zext <4 x i8> undef to <4 x i16>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v13 = zext <4 x i8> undef to <4 x i32>
; CHECK: Cost Model: Found an estimated cost of 7 for instruction: %v14 = zext <4 x i8> undef to <4 x i64>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v13 = zext <4 x i8> undef to <4 x i32>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v14 = zext <4 x i8> undef to <4 x i64>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v15 = zext <4 x i16> undef to <4 x i32>
; CHECK: Cost Model: Found an estimated cost of 5 for instruction: %v16 = zext <4 x i16> undef to <4 x i64>
; CHECK: Cost Model: Found an estimated cost of 3 for instruction: %v17 = zext <4 x i32> undef to <4 x i64>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v16 = zext <4 x i16> undef to <4 x i64>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v17 = zext <4 x i32> undef to <4 x i64>
; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %v18 = zext <8 x i8> undef to <8 x i16>
; CHECK: Cost Model: Found an estimated cost of 5 for instruction: %v19 = zext <8 x i8> undef to <8 x i32>
; CHECK: Cost Model: Found an estimated cost of 15 for instruction: %v20 = zext <8 x i8> undef to <8 x i64>
; CHECK: Cost Model: Found an estimated cost of 3 for instruction: %v21 = zext <8 x i16> undef to <8 x i32>
; CHECK: Cost Model: Found an estimated cost of 11 for instruction: %v22 = zext <8 x i16> undef to <8 x i64>
; CHECK: Cost Model: Found an estimated cost of 6 for instruction: %v23 = zext <8 x i32> undef to <8 x i64>
; CHECK: Cost Model: Found an estimated cost of 3 for instruction: %v24 = zext <16 x i8> undef to <16 x i16>
; CHECK: Cost Model: Found an estimated cost of 11 for instruction: %v25 = zext <16 x i8> undef to <16 x i32>
; CHECK: Cost Model: Found an estimated cost of 31 for instruction: %v26 = zext <16 x i8> undef to <16 x i64>
; CHECK: Cost Model: Found an estimated cost of 6 for instruction: %v27 = zext <16 x i16> undef to <16 x i32>
; CHECK: Cost Model: Found an estimated cost of 22 for instruction: %v28 = zext <16 x i16> undef to <16 x i64>
; CHECK: Cost Model: Found an estimated cost of 12 for instruction: %v29 = zext <16 x i32> undef to <16 x i64>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v19 = zext <8 x i8> undef to <8 x i32>
; CHECK: Cost Model: Found an estimated cost of 4 for instruction: %v20 = zext <8 x i8> undef to <8 x i64>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v21 = zext <8 x i16> undef to <8 x i32>
; CHECK: Cost Model: Found an estimated cost of 4 for instruction: %v22 = zext <8 x i16> undef to <8 x i64>
; CHECK: Cost Model: Found an estimated cost of 4 for instruction: %v23 = zext <8 x i32> undef to <8 x i64>
; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %v24 = zext <16 x i8> undef to <16 x i16>
; CHECK: Cost Model: Found an estimated cost of 4 for instruction: %v25 = zext <16 x i8> undef to <16 x i32>
; CHECK: Cost Model: Found an estimated cost of 8 for instruction: %v26 = zext <16 x i8> undef to <16 x i64>
; CHECK: Cost Model: Found an estimated cost of 4 for instruction: %v27 = zext <16 x i16> undef to <16 x i32>
; CHECK: Cost Model: Found an estimated cost of 8 for instruction: %v28 = zext <16 x i16> undef to <16 x i64>
; CHECK: Cost Model: Found an estimated cost of 8 for instruction: %v29 = zext <16 x i32> undef to <16 x i64>
ret void
}