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Code Model: Improve the accuracy of the zext/sext/trunc vector cost estimation.

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llvm-svn: 167412
This commit is contained in:
Nadav Rotem 2012-11-05 22:20:53 +00:00
parent 0befa1c4e0
commit 8ddfd47801
3 changed files with 46 additions and 5 deletions
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13
lib/Target/TargetTransformImpl.cpp
View File

@ -101,7 +101,7 @@ int VectorTargetTransformImpl::InstructionOpcodeToISD(unsigned Opcode) const {
case AtomicRMW: return 0;
case Trunc: return ISD::TRUNCATE;
case ZExt: return ISD::ZERO_EXTEND;
case SExt: return ISD::SEXTLOAD;
case SExt: return ISD::SIGN_EXTEND;
case FPToUI: return ISD::FP_TO_UINT;
case FPToSI: return ISD::FP_TO_SINT;
case UIToFP: return ISD::UINT_TO_FP;
@ -235,9 +235,17 @@ unsigned VectorTargetTransformImpl::getCastInstrCost(unsigned Opcode, Type *Dst,
SrcLT.second.getSizeInBits() == DstLT.second.getSizeInBits()) {
// Bitcast between types that are legalized to the same type are free.
if (Opcode == Instruction::BitCast)
if (Opcode == Instruction::BitCast || Opcode == Instruction::Trunc)
return 0;
// Assume that Zext is done using AND.
if (Opcode == Instruction::ZExt)
return 1;
// Assume that sext is done using SHL and SRA.
if (Opcode == Instruction::SExt)
return 2;
// Just check the op cost. If the operation is legal then assume it costs
// 1 and multiply by the type-legalization overhead.
if (!TLI->isOperationExpand(ISD, DstLT.second))
@ -310,7 +318,6 @@ unsigned VectorTargetTransformImpl::getCmpSelInstrCost(unsigned Opcode,
return 1;
}
/// Returns the expected cost of Vector Insert and Extract.
unsigned VectorTargetTransformImpl::getVectorInstrCost(unsigned Opcode,
Type *Val,
unsigned Index) const {

34
test/Analysis/CostModel/X86/cast.ll Normal file
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@ -0,0 +1,34 @@
; RUN: opt < %s -cost-model -analyze -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
define i32 @add(i32 %arg) {
; -- Same size registeres --
;CHECK: cost of 1 {{.*}} zext
%A = zext <4 x i1> undef to <4 x i32>
;CHECK: cost of 2 {{.*}} sext
%B = sext <4 x i1> undef to <4 x i32>
;CHECK: cost of 0 {{.*}} trunc
%C = trunc <4 x i32> undef to <4 x i1>
; -- Different size registers --
;CHECK-NOT: cost of 1 {{.*}} zext
%D = zext <8 x i1> undef to <8 x i32>
;CHECK-NOT: cost of 2 {{.*}} sext
%E = sext <8 x i1> undef to <8 x i32>
;CHECK-NOT: cost of 2 {{.*}} trunc
%F = trunc <8 x i32> undef to <8 x i1>
; -- scalars --
;CHECK: cost of 1 {{.*}} zext
%G = zext i1 undef to i32
;CHECK: cost of 0 {{.*}} trunc
%H = trunc i32 undef to i1
;CHECK: cost of 1 {{.*}} ret
ret i32 undef
}

4
test/Transforms/LoopVectorize/X86/conversion-cost.ll
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@ -4,7 +4,7 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
target triple = "x86_64-apple-macosx10.8.0"
;CHECK: @conversion_cost1
;CHECK: store <8 x i8>
;CHECK: store <2 x i8>
;CHECK: ret
define i32 @conversion_cost1(i32 %n, i8* nocapture %A, float* nocapture %B) nounwind uwtable ssp {
%1 = icmp sgt i32 %n, 3
@ -25,7 +25,7 @@ define i32 @conversion_cost1(i32 %n, i8* nocapture %A, float* nocapture %B) noun
}
;CHECK: @conversion_cost2
;CHECK-NOT: <8 x float>
;CHECK: <2 x float>
;CHECK: ret
define i32 @conversion_cost2(i32 %n, i8* nocapture %A, float* nocapture %B) nounwind uwtable ssp {
%1 = icmp sgt i32 %n, 9