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[SystemZ::TTI] Recognize the higher cost of scalar i1 -> fp conversion

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Scalar i1 to fp conversions are done with a branch sequence, so it should
have a higher cost.

Review: Ulrich Weigand
https://reviews.llvm.org/D53924

llvm-svn: 345818
This commit is contained in:
Jonas Paulsson 2018-11-01 09:05:32 +00:00
parent 32a4de4d92
commit fcbde114fe
2 changed files with 26 additions and 1 deletions
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4
lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
View File

@ -749,7 +749,9 @@ int SystemZTTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src,
assert (!Dst->isVectorTy());
if (Opcode == Instruction::SIToFP || Opcode == Instruction::UIToFP)
return (SrcScalarBits >= 32 ? 1 : 2 /*i8/i16 extend*/);
return (SrcScalarBits >= 32
? 1
: SrcScalarBits > 1 ? 2 /*i8/i16 extend*/ : 5 /*branch seq.*/);
if ((Opcode == Instruction::ZExt || Opcode == Instruction::SExt) &&
Src->isIntegerTy(1)) {

23
test/Analysis/CostModel/SystemZ/cmp-tofp-scalar.ll Normal file
View File

@ -0,0 +1,23 @@
; RUN: opt < %s -cost-model -analyze -mtriple=systemz-unknown -mcpu=z13 | FileCheck %s
;
; Costs for conversion of i1 to fp.
define float @fun0(i64 %val1, i64 %val2) {
%cmp = icmp eq i64 %val1, %val2
%v = uitofp i1 %cmp to float
ret float %v
; CHECK: fun0
; CHECK: cost of 1 for instruction: %cmp = icmp eq i64 %val1, %val2
; CHECK: cost of 5 for instruction: %v = uitofp i1 %cmp to float
}
define double @fun1(i64 %val1, i64 %val2) {
%cmp = icmp eq i64 %val1, %val2
%v = uitofp i1 %cmp to double
ret double %v
; CHECK: fun1
; CHECK: cost of 1 for instruction: %cmp = icmp eq i64 %val1, %val2
; CHECK: cost of 5 for instruction: %v = uitofp i1 %cmp to double
}