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ARM cost model: Correct cost for some cheap float to integer conversions

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Fix cost of some "cheap" cast instructions. Before this patch we used to
estimate for example:
  cost of 16 for instruction:   %r = fptoui <4 x float> %v0 to <4 x i16>

While we would emit:
  vcvt.s32.f32  q8, q8
  vmovn.i32 d16, q8
  vuzp.8  d16, d17

All other costs are left to the values assigned by the fallback logic. Theses
costs are mostly reasonable in the sense that they get progressively more
expensive as the instruction sequences emitted get longer.

radar://13434072

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177333 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer 2013-03-18 22:47:06 +00:00
parent e572809aa1
commit 01f2571014
2 changed files with 179 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
lib/Target/ARM/ARMTargetTransformInfo.cpp
View File

@ -224,12 +224,20 @@ unsigned ARMTTI::getCastInstrCost(unsigned Opcode, Type *Dst,
{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 },
{ ISD::FP_TO_SINT, MVT::v4i32, MVT::v4f32, 1 },
{ ISD::FP_TO_UINT, MVT::v4i32, MVT::v4f32, 1 },
{ ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 3 },
{ ISD::FP_TO_UINT, MVT::v4i8, MVT::v4f32, 3 },
{ ISD::FP_TO_SINT, MVT::v4i16, MVT::v4f32, 2 },
{ ISD::FP_TO_UINT, MVT::v4i16, MVT::v4f32, 2 },
// Vector double <-> i32 conversions.
{ ISD::SINT_TO_FP, MVT::v2f64, MVT::v2i32, 2 },
{ ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i32, 2 },
{ ISD::FP_TO_SINT, MVT::v2i32, MVT::v2f64, 2 },
{ ISD::FP_TO_UINT, MVT::v2i32, MVT::v2f64, 2 }
{ ISD::FP_TO_UINT, MVT::v2i32, MVT::v2f64, 2 },
{ ISD::FP_TO_SINT, MVT::v8i16, MVT::v8f32, 4 },
{ ISD::FP_TO_UINT, MVT::v8i16, MVT::v8f32, 4 },
{ ISD::FP_TO_SINT, MVT::v16i16, MVT::v16f32, 8 },
{ ISD::FP_TO_UINT, MVT::v16i16, MVT::v16f32, 8 }
};
if (SrcTy.isVector() && ST->hasNEON()) {

171
test/Analysis/CostModel/ARM/cast.ll
View File

@ -1,4 +1,4 @@
; RUN: opt < %s -cost-model -analyze -mtriple=thumbv7-apple-ios6.0.0 -mcpu=swift | FileCheck %s
; RUN: opt < %s -cost-model -analyze -mtriple=thumbv7-apple-ios6.0.0 -mcpu=cortex-a8 | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"
target triple = "thumbv7-apple-ios6.0.0"
@ -190,6 +190,175 @@ define i32 @casts() {
; CHECK: cost of 16 {{.*}} fpext <16 x float
%r89 = fpext <16 x float> undef to <16 x double>
;; Floating point to integer vector casts.
; CHECK: cost of 1 {{.*}} fptoui
%r90 = fptoui <2 x float> undef to <2 x i1>
; CHECK: cost of 1 {{.*}} fptosi
%r91 = fptosi <2 x float> undef to <2 x i1>
; CHECK: cost of 1 {{.*}} fptoui
%r92 = fptoui <2 x float> undef to <2 x i8>
; CHECK: cost of 1 {{.*}} fptosi
%r93 = fptosi <2 x float> undef to <2 x i8>
; CHECK: cost of 1 {{.*}} fptoui
%r94 = fptoui <2 x float> undef to <2 x i16>
; CHECK: cost of 1 {{.*}} fptosi
%r95 = fptosi <2 x float> undef to <2 x i16>
; CHECK: cost of 1 {{.*}} fptoui
%r96 = fptoui <2 x float> undef to <2 x i32>
; CHECK: cost of 1 {{.*}} fptosi
%r97 = fptosi <2 x float> undef to <2 x i32>
; CHECK: cost of 24 {{.*}} fptoui
%r98 = fptoui <2 x float> undef to <2 x i64>
; CHECK: cost of 24 {{.*}} fptosi
%r99 = fptosi <2 x float> undef to <2 x i64>
; CHECK: cost of 8 {{.*}} fptoui
%r100 = fptoui <2 x double> undef to <2 x i1>
; CHECK: cost of 8 {{.*}} fptosi
%r101 = fptosi <2 x double> undef to <2 x i1>
; CHECK: cost of 8 {{.*}} fptoui
%r102 = fptoui <2 x double> undef to <2 x i8>
; CHECK: cost of 8 {{.*}} fptosi
%r103 = fptosi <2 x double> undef to <2 x i8>
; CHECK: cost of 8 {{.*}} fptoui
%r104 = fptoui <2 x double> undef to <2 x i16>
; CHECK: cost of 8 {{.*}} fptosi
%r105 = fptosi <2 x double> undef to <2 x i16>
; CHECK: cost of 2 {{.*}} fptoui
%r106 = fptoui <2 x double> undef to <2 x i32>
; CHECK: cost of 2 {{.*}} fptosi
%r107 = fptosi <2 x double> undef to <2 x i32>
; CHECK: cost of 24 {{.*}} fptoui
%r108 = fptoui <2 x double> undef to <2 x i64>
; CHECK: cost of 24 {{.*}} fptosi
%r109 = fptosi <2 x double> undef to <2 x i64>
; CHECK: cost of 16 {{.*}} fptoui
%r110 = fptoui <4 x float> undef to <4 x i1>
; CHECK: cost of 16 {{.*}} fptosi
%r111 = fptosi <4 x float> undef to <4 x i1>
; CHECK: cost of 3 {{.*}} fptoui
%r112 = fptoui <4 x float> undef to <4 x i8>
; CHECK: cost of 3 {{.*}} fptosi
%r113 = fptosi <4 x float> undef to <4 x i8>
; CHECK: cost of 2 {{.*}} fptoui
%r114 = fptoui <4 x float> undef to <4 x i16>
; CHECK: cost of 2 {{.*}} fptosi
%r115 = fptosi <4 x float> undef to <4 x i16>
; CHECK: cost of 1 {{.*}} fptoui
%r116 = fptoui <4 x float> undef to <4 x i32>
; CHECK: cost of 1 {{.*}} fptosi
%r117 = fptosi <4 x float> undef to <4 x i32>
; CHECK: cost of 48 {{.*}} fptoui
%r118 = fptoui <4 x float> undef to <4 x i64>
; CHECK: cost of 48 {{.*}} fptosi
%r119 = fptosi <4 x float> undef to <4 x i64>
; CHECK: cost of 16 {{.*}} fptoui
%r120 = fptoui <4 x double> undef to <4 x i1>
; CHECK: cost of 16 {{.*}} fptosi
%r121 = fptosi <4 x double> undef to <4 x i1>
; CHECK: cost of 16 {{.*}} fptoui
%r122 = fptoui <4 x double> undef to <4 x i8>
; CHECK: cost of 16 {{.*}} fptosi
%r123 = fptosi <4 x double> undef to <4 x i8>
; CHECK: cost of 16 {{.*}} fptoui
%r124 = fptoui <4 x double> undef to <4 x i16>
; CHECK: cost of 16 {{.*}} fptosi
%r125 = fptosi <4 x double> undef to <4 x i16>
; CHECK: cost of 16 {{.*}} fptoui
%r126 = fptoui <4 x double> undef to <4 x i32>
; CHECK: cost of 16 {{.*}} fptosi
%r127 = fptosi <4 x double> undef to <4 x i32>
; CHECK: cost of 48 {{.*}} fptoui
%r128 = fptoui <4 x double> undef to <4 x i64>
; CHECK: cost of 48 {{.*}} fptosi
%r129 = fptosi <4 x double> undef to <4 x i64>
; CHECK: cost of 32 {{.*}} fptoui
%r130 = fptoui <8 x float> undef to <8 x i1>
; CHECK: cost of 32 {{.*}} fptosi
%r131 = fptosi <8 x float> undef to <8 x i1>
; CHECK: cost of 32 {{.*}} fptoui
%r132 = fptoui <8 x float> undef to <8 x i8>
; CHECK: cost of 32 {{.*}} fptosi
%r133 = fptosi <8 x float> undef to <8 x i8>
; CHECK: cost of 4 {{.*}} fptoui
%r134 = fptoui <8 x float> undef to <8 x i16>
; CHECK: cost of 4 {{.*}} fptosi
%r135 = fptosi <8 x float> undef to <8 x i16>
; CHECK: cost of 2 {{.*}} fptoui
%r136 = fptoui <8 x float> undef to <8 x i32>
; CHECK: cost of 2 {{.*}} fptosi
%r137 = fptosi <8 x float> undef to <8 x i32>
; CHECK: cost of 96 {{.*}} fptoui
%r138 = fptoui <8 x float> undef to <8 x i64>
; CHECK: cost of 96 {{.*}} fptosi
%r139 = fptosi <8 x float> undef to <8 x i64>
; CHECK: cost of 32 {{.*}} fptoui
%r140 = fptoui <8 x double> undef to <8 x i1>
; CHECK: cost of 32 {{.*}} fptosi
%r141 = fptosi <8 x double> undef to <8 x i1>
; CHECK: cost of 32 {{.*}} fptoui
%r142 = fptoui <8 x double> undef to <8 x i8>
; CHECK: cost of 32 {{.*}} fptosi
%r143 = fptosi <8 x double> undef to <8 x i8>
; CHECK: cost of 32 {{.*}} fptoui
%r144 = fptoui <8 x double> undef to <8 x i16>
; CHECK: cost of 32 {{.*}} fptosi
%r145 = fptosi <8 x double> undef to <8 x i16>
; CHECK: cost of 32 {{.*}} fptoui
%r146 = fptoui <8 x double> undef to <8 x i32>
; CHECK: cost of 32 {{.*}} fptosi
%r147 = fptosi <8 x double> undef to <8 x i32>
; CHECK: cost of 96 {{.*}} fptoui
%r148 = fptoui <8 x double> undef to <8 x i64>
; CHECK: cost of 96 {{.*}} fptosi
%r149 = fptosi <8 x double> undef to <8 x i64>
; CHECK: cost of 64 {{.*}} fptoui
%r150 = fptoui <16 x float> undef to <16 x i1>
; CHECK: cost of 64 {{.*}} fptosi
%r151 = fptosi <16 x float> undef to <16 x i1>
; CHECK: cost of 64 {{.*}} fptoui
%r152 = fptoui <16 x float> undef to <16 x i8>
; CHECK: cost of 64 {{.*}} fptosi
%r153 = fptosi <16 x float> undef to <16 x i8>
; CHECK: cost of 8 {{.*}} fptoui
%r154 = fptoui <16 x float> undef to <16 x i16>
; CHECK: cost of 8 {{.*}} fptosi
%r155 = fptosi <16 x float> undef to <16 x i16>
; CHECK: cost of 4 {{.*}} fptoui
%r156 = fptoui <16 x float> undef to <16 x i32>
; CHECK: cost of 4 {{.*}} fptosi
%r157 = fptosi <16 x float> undef to <16 x i32>
; CHECK: cost of 192 {{.*}} fptoui
%r158 = fptoui <16 x float> undef to <16 x i64>
; CHECK: cost of 192 {{.*}} fptosi
%r159 = fptosi <16 x float> undef to <16 x i64>
; CHECK: cost of 64 {{.*}} fptoui
%r160 = fptoui <16 x double> undef to <16 x i1>
; CHECK: cost of 64 {{.*}} fptosi
%r161 = fptosi <16 x double> undef to <16 x i1>
; CHECK: cost of 64 {{.*}} fptoui
%r162 = fptoui <16 x double> undef to <16 x i8>
; CHECK: cost of 64 {{.*}} fptosi
%r163 = fptosi <16 x double> undef to <16 x i8>
; CHECK: cost of 64 {{.*}} fptoui
%r164 = fptoui <16 x double> undef to <16 x i16>
; CHECK: cost of 64 {{.*}} fptosi
%r165 = fptosi <16 x double> undef to <16 x i16>
; CHECK: cost of 64 {{.*}} fptoui
%r166 = fptoui <16 x double> undef to <16 x i32>
; CHECK: cost of 64 {{.*}} fptosi
%r167 = fptosi <16 x double> undef to <16 x i32>
; CHECK: cost of 192 {{.*}} fptoui
%r168 = fptoui <16 x double> undef to <16 x i64>
; CHECK: cost of 192 {{.*}} fptosi
%r169 = fptosi <16 x double> undef to <16 x i64>
;CHECK: cost of 0 {{.*}} ret
ret i32 undef
}