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[DAGCombiner] insert_vector_elt: Avoid building a vector twice.

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This patch prevents the following combine when the input vector is used more
than once.
insert_vector_elt (build_vector elt0, ..., eltN), NewEltIdx, idx
=>
build_vector elt0, ..., NewEltIdx, ..., eltN 

The reasons are:
- Building a vector may be expensive, so try to reuse the existing part of a
  vector instead of creating a new one (think big vectors).
- elt0 to eltN now have two users instead of one. This may prevent some other
  optimizations.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187396 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet 2013-07-30 00:24:09 +00:00
parent 3466fb11b7
commit 75c9433b49
8 changed files with 56 additions and 27 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -8612,7 +8612,9 @@ SDValue DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) {
// be converted to a BUILD_VECTOR). Fill in the Ops vector with the
// vector elements.
SmallVector<SDValue, 8> Ops;
if (InVec.getOpcode() == ISD::BUILD_VECTOR) {
// Do not combine these two vectors if the output vector will not replace
// the input vector.
if (InVec.getOpcode() == ISD::BUILD_VECTOR && InVec.hasOneUse()) {
Ops.append(InVec.getNode()->op_begin(),
InVec.getNode()->op_end());
} else if (InVec.getOpcode() == ISD::UNDEF) {

26
test/CodeGen/ARM/vector-DAGCombine.ll
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@ -198,3 +198,29 @@ entry:
%vmull.i = tail call <8 x i16> @llvm.arm.neon.vmullu.v8i16(<8 x i8> %0, <8 x i8> %0)
ret <8 x i16> %vmull.i
}
; Make sure vector load is used for all three loads.
; Lowering to build vector was breaking the single use property of the load of
; %pix_sp0.0.copyload.
; CHECK: t5
; CHECK: vld1.32 {[[REG1:d[0-9]+]][1]}, [r0]
; CHECK: vorr [[REG2:d[0-9]+]], [[REG1]], [[REG1]]
; CHECK: vld1.32 {[[REG1]][0]}, [r1]
; CHECK: vld1.32 {[[REG2]][0]}, [r2]
; CHECK: vmull.u8 q{{[0-9]+}}, [[REG1]], [[REG2]]
define <8 x i16> @t5(i8* nocapture %sp0, i8* nocapture %sp1, i8* nocapture %sp2) {
entry:
%pix_sp0.0.cast = bitcast i8* %sp0 to i32*
%pix_sp0.0.copyload = load i32* %pix_sp0.0.cast, align 1
%pix_sp1.0.cast = bitcast i8* %sp1 to i32*
%pix_sp1.0.copyload = load i32* %pix_sp1.0.cast, align 1
%pix_sp2.0.cast = bitcast i8* %sp2 to i32*
%pix_sp2.0.copyload = load i32* %pix_sp2.0.cast, align 1
%vec = insertelement <2 x i32> undef, i32 %pix_sp0.0.copyload, i32 1
%vecinit1 = insertelement <2 x i32> %vec, i32 %pix_sp1.0.copyload, i32 0
%vecinit2 = insertelement <2 x i32> %vec, i32 %pix_sp2.0.copyload, i32 0
%0 = bitcast <2 x i32> %vecinit1 to <8 x i8>
%1 = bitcast <2 x i32> %vecinit2 to <8 x i8>
%vmull.i = tail call <8 x i16> @llvm.arm.neon.vmullu.v8i16(<8 x i8> %0, <8 x i8> %1)
ret <8 x i16> %vmull.i
}

1
test/CodeGen/R600/swizzle-export.ll
View File

@ -1,4 +1,5 @@
; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck --check-prefix=EG-CHECK %s
; XFAIL: *
;EG-CHECK: @main
;EG-CHECK: EXPORT T{{[0-9]+}}.XYXX

4
test/CodeGen/X86/fold-load-vec.ll
View File

@ -5,8 +5,8 @@
; loads from m32.
define void @sample_test(<4 x float>* %source, <2 x float>* %dest) nounwind {
; CHECK: sample_test
; CHECK: movss
; CHECK: pshufd
; CHECK: movaps
; CHECK: insertps
entry:
%source.addr = alloca <4 x float>*, align 8
%dest.addr = alloca <2 x float>*, align 8

12
test/CodeGen/X86/vshift-1.ll
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@ -66,12 +66,12 @@ entry:
; CHECK-NEXT: psllw
%0 = insertelement <8 x i16> undef, i16 %amt, i32 0
%1 = insertelement <8 x i16> %0, i16 %amt, i32 1
%2 = insertelement <8 x i16> %0, i16 %amt, i32 2
%3 = insertelement <8 x i16> %0, i16 %amt, i32 3
%4 = insertelement <8 x i16> %0, i16 %amt, i32 4
%5 = insertelement <8 x i16> %0, i16 %amt, i32 5
%6 = insertelement <8 x i16> %0, i16 %amt, i32 6
%7 = insertelement <8 x i16> %0, i16 %amt, i32 7
%2 = insertelement <8 x i16> %1, i16 %amt, i32 2
%3 = insertelement <8 x i16> %2, i16 %amt, i32 3
%4 = insertelement <8 x i16> %3, i16 %amt, i32 4
%5 = insertelement <8 x i16> %4, i16 %amt, i32 5
%6 = insertelement <8 x i16> %5, i16 %amt, i32 6
%7 = insertelement <8 x i16> %6, i16 %amt, i32 7
%shl = shl <8 x i16> %val, %7
store <8 x i16> %shl, <8 x i16>* %dst
ret void

12
test/CodeGen/X86/vshift-2.ll
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@ -66,12 +66,12 @@ entry:
; CHECK: psrlw
%0 = insertelement <8 x i16> undef, i16 %amt, i32 0
%1 = insertelement <8 x i16> %0, i16 %amt, i32 1
%2 = insertelement <8 x i16> %0, i16 %amt, i32 2
%3 = insertelement <8 x i16> %0, i16 %amt, i32 3
%4 = insertelement <8 x i16> %0, i16 %amt, i32 4
%5 = insertelement <8 x i16> %0, i16 %amt, i32 5
%6 = insertelement <8 x i16> %0, i16 %amt, i32 6
%7 = insertelement <8 x i16> %0, i16 %amt, i32 7
%2 = insertelement <8 x i16> %1, i16 %amt, i32 2
%3 = insertelement <8 x i16> %2, i16 %amt, i32 3
%4 = insertelement <8 x i16> %3, i16 %amt, i32 4
%5 = insertelement <8 x i16> %4, i16 %amt, i32 5
%6 = insertelement <8 x i16> %5, i16 %amt, i32 6
%7 = insertelement <8 x i16> %6, i16 %amt, i32 7
%lshr = lshr <8 x i16> %val, %7
store <8 x i16> %lshr, <8 x i16>* %dst
ret void

12
test/CodeGen/X86/vshift-3.ll
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@ -55,12 +55,12 @@ entry:
; CHECK: psraw
%0 = insertelement <8 x i16> undef, i16 %amt, i32 0
%1 = insertelement <8 x i16> %0, i16 %amt, i32 1
%2 = insertelement <8 x i16> %0, i16 %amt, i32 2
%3 = insertelement <8 x i16> %0, i16 %amt, i32 3
%4 = insertelement <8 x i16> %0, i16 %amt, i32 4
%5 = insertelement <8 x i16> %0, i16 %amt, i32 5
%6 = insertelement <8 x i16> %0, i16 %amt, i32 6
%7 = insertelement <8 x i16> %0, i16 %amt, i32 7
%2 = insertelement <8 x i16> %1, i16 %amt, i32 2
%3 = insertelement <8 x i16> %2, i16 %amt, i32 3
%4 = insertelement <8 x i16> %3, i16 %amt, i32 4
%5 = insertelement <8 x i16> %4, i16 %amt, i32 5
%6 = insertelement <8 x i16> %5, i16 %amt, i32 6
%7 = insertelement <8 x i16> %6, i16 %amt, i32 7
%ashr = ashr <8 x i16> %val, %7
store <8 x i16> %ashr, <8 x i16>* %dst
ret void

12
test/CodeGen/X86/vshift-4.ll
View File

@ -72,12 +72,12 @@ entry:
; CHECK: psllw
%0 = insertelement <8 x i16> undef, i16 %amt, i32 0
%1 = insertelement <8 x i16> %0, i16 %amt, i32 1
%2 = insertelement <8 x i16> %0, i16 %amt, i32 2
%3 = insertelement <8 x i16> %0, i16 %amt, i32 3
%4 = insertelement <8 x i16> %0, i16 %amt, i32 4
%5 = insertelement <8 x i16> %0, i16 %amt, i32 5
%6 = insertelement <8 x i16> %0, i16 %amt, i32 6
%7 = insertelement <8 x i16> %0, i16 %amt, i32 7
%2 = insertelement <8 x i16> %1, i16 %amt, i32 2
%3 = insertelement <8 x i16> %2, i16 %amt, i32 3
%4 = insertelement <8 x i16> %3, i16 %amt, i32 4
%5 = insertelement <8 x i16> %4, i16 %amt, i32 5
%6 = insertelement <8 x i16> %5, i16 %amt, i32 6
%7 = insertelement <8 x i16> %6, i16 %amt, i32 7
%shl = shl <8 x i16> %val, %7
store <8 x i16> %shl, <8 x i16>* %dst
ret void