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ARM cost model: Fix costs for some vector selects

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I was too pessimistic in r177105. Vector selects that fit into a legal register
type lower just fine. I was mislead by the code fragment that I was using. The
stores/loads that I saw in those cases came from lowering the conditional off
an address.

Changing the code fragment to:

%T0_3 = type <8 x i18>
%T1_3 = type <8 x i1>

define void @func_blend3(%T0_3* %loadaddr, %T0_3* %loadaddr2,
                         %T1_3* %blend, %T0_3* %storeaddr) {
  %v0 = load %T0_3* %loadaddr
  %v1 = load %T0_3* %loadaddr2
==> FROM:
  ;%c = load %T1_3* %blend
==> TO:
  %c = icmp slt %T0_3 %v0, %v1
==> USE:
  %r = select %T1_3 %c, %T0_3 %v0, %T0_3 %v1

  store %T0_3 %r, %T0_3* %storeaddr
  ret void
}

revealed this mistake.

radar://13403975

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177170 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2013-03-15 18:31:01 +00:00
parent bcbf3fddef
commit 5193e4ebe2
3 changed files with 15 additions and 116 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
test/Analysis/CostModel/ARM/select.ll
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@@ -21,18 +21,18 @@ define void @casts() {
; Vector values
; CHECK: cost of 1 {{.*}} select
%v7 = select <2 x i1> undef, <2 x i8> undef, <2 x i8> undef
; CHECK: cost of 10 {{.*}} select
; CHECK: cost of 1 {{.*}} select
%v8 = select <4 x i1> undef, <4 x i8> undef, <4 x i8> undef
; CHECK: cost of 17 {{.*}} select
; CHECK: cost of 1 {{.*}} select
%v9 = select <8 x i1> undef, <8 x i8> undef, <8 x i8> undef
; CHECK: cost of 33 {{.*}} select
; CHECK: cost of 1 {{.*}} select
%v10 = select <16 x i1> undef, <16 x i8> undef, <16 x i8> undef
; CHECK: cost of 1 {{.*}} select
%v11 = select <2 x i1> undef, <2 x i16> undef, <2 x i16> undef
; CHECK: cost of 9 {{.*}} select
; CHECK: cost of 1 {{.*}} select
%v12 = select <4 x i1> undef, <4 x i16> undef, <4 x i16> undef
; CHECK: cost of 17 {{.*}} select
; CHECK: cost of 1 {{.*}} select
%v13 = select <8 x i1> undef, <8 x i16> undef, <8 x i16> undef
; CHECK: cost of 40 {{.*}} select
%v13b = select <16 x i1> undef, <16 x i16> undef, <16 x i16> undef