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llvm-6502/test/CodeGen/ARM/vector-promotion.ll
Quentin Colombet 9b6ca9304c [CodeGenPrepare] Move extractelement close to store if they can be combined. 
This patch adds an optimization in CodeGenPrepare to move an extractelement
right before a store when the target can combine them.
The optimization may promote any scalar operations to vector operations in the
way to make that possible.


** Context **

Some targets use different register files for both vector and scalar operations.
This means that transitioning from one domain to another may incur copy from one
register file to another. These copies are not coalescable and may be expensive.
For example, according to the scheduling model, on cortex-A8 a vector to GPR
move is 20 cycles.


** Motivating Example **

Let us consider an example:
define void @foo(<2 x i32>* %addr1, i32* %dest) {
 %in1 = load <2 x i32>* %addr1, align 8
 %extract = extractelement <2 x i32> %in1, i32 1
 %out = or i32 %extract, 1
 store i32 %out, i32* %dest, align 4
 ret void
}

As it is, this IR generates the following assembly on armv7:
  vldr  d16, [r0]            @vector load  
  vmov.32 r0, d16[1]  @ cross-register-file copy: 20 cycles
  orr r0, r0, #1           @ scalar bitwise or
  str r0, [r1]               @ scalar store
  bx  lr

Whereas we could generate much faster code:
  vldr  d16, [r0]               @ vector load
  vorr.i32  d16, #0x1     @ vector bitwise or
  vst1.32 {d16[1]}, [r1:32] @ vector extract + store
  bx  lr

Half of the computation made in the vector is useless, but this allows to get
rid of the expensive cross-register-file copy.


** Proposed Solution **

To avoid this cross-register-copy penalty, we promote the scalar operations to
vector operations. The penalty will be removed if we manage to promote the whole
chain of computation in the vector domain.
Currently, we do that only when the chain of computation ends by a store and the
target is able to combine an extract with a store.

Stores are the most likely candidates, because other instructions produce values
that would need to be promoted and so, extracted as some point[1]. Moreover,
this is customary that targets feature stores that perform a vector extract (see
AArch64 and X86 for instance).

The proposed implementation relies on the TargetTransformInfo to decide whether
or not it is beneficial to promote a chain of computation in the vector domain.
Unfortunately, this interface is rather inaccurate for this level of details and
although this optimization may be beneficial for X86 and AArch64, the inaccuracy
will lead to the optimization being too aggressive.
Basically in TargetTransformInfo, everything that is legal has a cost of 1,
whereas, even if a vector type is legal, usually a vector operation is slightly
more expensive than its scalar counterpart. That will lead to too many
promotions that may not be counter balanced by the saving of the
cross-register-file copy. For instance, on AArch64 this penalty is just 4
cycles.

For now, the optimization is just enabled for ARM prior than v8, since those
processors have a larger penalty on cross-register-file copies, and the scope is
limited to basic blocks. Because of these two factors, we limit the effects of
the inaccuracy. Indeed, I did not want to build up a fancy cost model with block
frequency and everything on top of that.

[1] We can imagine targets that can combine an extractelement with  other
instructions than just stores. If we want to go into that direction, the current
interfaces must be augmented and, moreover, I think this becomes a global isel
problem.

Differential Revision: http://reviews.llvm.org/D5921

<rdar://problem/14170854>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220978 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-31 17:52:53 +00:00

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; RUN: opt -codegenprepare -mtriple=thumbv7-apple-ios %s -o - -mattr=+neon -S | FileCheck --check-prefix=IR-BOTH --check-prefix=IR-NORMAL %s
; RUN: opt -codegenprepare -mtriple=thumbv7-apple-ios %s -o - -mattr=+neon -S -stress-cgp-store-extract | FileCheck --check-prefix=IR-BOTH --check-prefix=IR-STRESS %s
; RUN: llc -mtriple=thumbv7-apple-ios %s -o - -mattr=+neon | FileCheck --check-prefix=ASM %s
; IR-BOTH-LABEL: @simpleOneInstructionPromotion
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; IR-BOTH-NEXT: [[VECTOR_OR:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[LOAD]], <i32 undef, i32 1>
; IR-BOTH-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[VECTOR_OR]], i32 1
; IR-BOTH-NEXT: store i32 [[EXTRACT]], i32* %dest
; IR-BOTH-NEXT: ret
;
; Make sure we got rid of any expensive vmov.32 instructions.
; ASM-LABEL: simpleOneInstructionPromotion:
; ASM: vldr [[LOAD:d[0-9]+]], [r0]
; ASM-NEXT: vorr.i32 [[LOAD]], #0x1
; ASM-NEXT: vst1.32 {[[LOAD]][1]}, [r1:32]
; ASM-NEXT: bx
define void @simpleOneInstructionPromotion(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 1
%out = or i32 %extract, 1
store i32 %out, i32* %dest, align 4
ret void
}
; IR-BOTH-LABEL: @unsupportedInstructionForPromotion
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; IR-BOTH-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 0
; IR-BOTH-NEXT: [[CMP:%[a-zA-Z_0-9-]+]] = icmp eq i32 [[EXTRACT]], %in2
; IR-BOTH-NEXT: store i1 [[CMP]], i1* %dest
; IR-BOTH-NEXT: ret
;
; ASM-LABEL: unsupportedInstructionForPromotion:
; ASM: vldr [[LOAD:d[0-9]+]], [r0]
; ASM: vmov.32 {{r[0-9]+}}, [[LOAD]]
; ASM: bx
define void @unsupportedInstructionForPromotion(<2 x i32>* %addr1, i32 %in2, i1* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 0
%out = icmp eq i32 %extract, %in2
store i1 %out, i1* %dest, align 4
ret void
}
; IR-BOTH-LABEL: @unsupportedChainInDifferentBBs
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; IR-BOTH-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 0
; IR-BOTH-NEXT: br i1 %bool, label %bb2, label %end
; BB2
; IR-BOTH: [[OR:%[a-zA-Z_0-9-]+]] = or i32 [[EXTRACT]], 1
; IR-BOTH-NEXT: store i32 [[OR]], i32* %dest, align 4
; IR-BOTH: ret
;
; ASM-LABEL: unsupportedChainInDifferentBBs:
; ASM: vldrne [[LOAD:d[0-9]+]], [r0]
; ASM: vmovne.32 {{r[0-9]+}}, [[LOAD]]
; ASM: bx
define void @unsupportedChainInDifferentBBs(<2 x i32>* %addr1, i32* %dest, i1 %bool) {
bb1:
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 0
br i1 %bool, label %bb2, label %end
bb2:
%out = or i32 %extract, 1
store i32 %out, i32* %dest, align 4
br label %end
end:
ret void
}
; IR-LABEL: @chainOfInstructionsToPromote
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; IR-BOTH-NEXT: [[VECTOR_OR1:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[LOAD]], <i32 1, i32 undef>
; IR-BOTH-NEXT: [[VECTOR_OR2:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[VECTOR_OR1]], <i32 1, i32 undef>
; IR-BOTH-NEXT: [[VECTOR_OR3:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[VECTOR_OR2]], <i32 1, i32 undef>
; IR-BOTH-NEXT: [[VECTOR_OR4:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[VECTOR_OR3]], <i32 1, i32 undef>
; IR-BOTH-NEXT: [[VECTOR_OR5:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[VECTOR_OR4]], <i32 1, i32 undef>
; IR-BOTH-NEXT: [[VECTOR_OR6:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[VECTOR_OR5]], <i32 1, i32 undef>
; IR-BOTH-NEXT: [[VECTOR_OR7:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[VECTOR_OR6]], <i32 1, i32 undef>
; IR-BOTH-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[VECTOR_OR7]], i32 0
; IR-BOTH-NEXT: store i32 [[EXTRACT]], i32* %dest
; IR-BOTH-NEXT: ret
;
; ASM-LABEL: chainOfInstructionsToPromote:
; ASM: vldr [[LOAD:d[0-9]+]], [r0]
; ASM-NOT: vmov.32 {{r[0-9]+}}, [[LOAD]]
; ASM: bx
define void @chainOfInstructionsToPromote(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 0
%out1 = or i32 %extract, 1
%out2 = or i32 %out1, 1
%out3 = or i32 %out2, 1
%out4 = or i32 %out3, 1
%out5 = or i32 %out4, 1
%out6 = or i32 %out5, 1
%out7 = or i32 %out6, 1
store i32 %out7, i32* %dest, align 4
ret void
}
; IR-BOTH-LABEL: @unsupportedMultiUses
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; IR-BOTH-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 1
; IR-BOTH-NEXT: [[OR:%[a-zA-Z_0-9-]+]] = or i32 [[EXTRACT]], 1
; IR-BOTH-NEXT: store i32 [[OR]], i32* %dest
; IR-BOTH-NEXT: ret i32 [[OR]]
;
; ASM-LABEL: unsupportedMultiUses:
; ASM: vldr [[LOAD:d[0-9]+]], [r0]
; ASM: vmov.32 {{r[0-9]+}}, [[LOAD]]
; ASM: bx
define i32 @unsupportedMultiUses(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 1
%out = or i32 %extract, 1
store i32 %out, i32* %dest, align 4
ret i32 %out
}
; Check that we promote we a splat constant when this is a division.
; The NORMAL mode does not promote anything as divisions are not legal.
; IR-BOTH-LABEL: @udivCase
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = udiv i32 [[EXTRACT]], 7
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = udiv <2 x i32> [[LOAD]], <i32 7, i32 7>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store i32 [[RES]], i32* %dest
; IR-BOTH-NEXT: ret
define void @udivCase(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 1
%out = udiv i32 %extract, 7
store i32 %out, i32* %dest, align 4
ret void
}
; IR-BOTH-LABEL: @uremCase
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = urem i32 [[EXTRACT]], 7
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = urem <2 x i32> [[LOAD]], <i32 7, i32 7>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store i32 [[RES]], i32* %dest
; IR-BOTH-NEXT: ret
define void @uremCase(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 1
%out = urem i32 %extract, 7
store i32 %out, i32* %dest, align 4
ret void
}
; IR-BOTH-LABEL: @sdivCase
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = sdiv i32 [[EXTRACT]], 7
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = sdiv <2 x i32> [[LOAD]], <i32 7, i32 7>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store i32 [[RES]], i32* %dest
; IR-BOTH-NEXT: ret
define void @sdivCase(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 1
%out = sdiv i32 %extract, 7
store i32 %out, i32* %dest, align 4
ret void
}
; IR-BOTH-LABEL: @sremCase
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = srem i32 [[EXTRACT]], 7
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = srem <2 x i32> [[LOAD]], <i32 7, i32 7>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store i32 [[RES]], i32* %dest
; IR-BOTH-NEXT: ret
define void @sremCase(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 1
%out = srem i32 %extract, 7
store i32 %out, i32* %dest, align 4
ret void
}
; IR-BOTH-LABEL: @fdivCase
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x float>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = fdiv float [[EXTRACT]], 7.0
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = fdiv <2 x float> [[LOAD]], <float 7.000000e+00, float 7.000000e+00>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store float [[RES]], float* %dest
; IR-BOTH-NEXT: ret
define void @fdivCase(<2 x float>* %addr1, float* %dest) {
%in1 = load <2 x float>* %addr1, align 8
%extract = extractelement <2 x float> %in1, i32 1
%out = fdiv float %extract, 7.0
store float %out, float* %dest, align 4
ret void
}
; IR-BOTH-LABEL: @fremCase
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x float>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = frem float [[EXTRACT]], 7.0
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = frem <2 x float> [[LOAD]], <float 7.000000e+00, float 7.000000e+00>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store float [[RES]], float* %dest
; IR-BOTH-NEXT: ret
define void @fremCase(<2 x float>* %addr1, float* %dest) {
%in1 = load <2 x float>* %addr1, align 8
%extract = extractelement <2 x float> %in1, i32 1
%out = frem float %extract, 7.0
store float %out, float* %dest, align 4
ret void
}
; Check that we do not promote when we may introduce undefined behavior
; like division by zero.
; IR-BOTH-LABEL: @undefDivCase
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; IR-BOTH-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 1
; IR-BOTH-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = udiv i32 7, [[EXTRACT]]
; IR-BOTH-NEXT: store i32 [[RES]], i32* %dest
; IR-BOTH-NEXT: ret
define void @undefDivCase(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 1
%out = udiv i32 7, %extract
store i32 %out, i32* %dest, align 4
ret void
}
; Check that we do not promote when we may introduce undefined behavior
; like division by zero.
; IR-BOTH-LABEL: @undefRemCase
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; IR-BOTH-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 1
; IR-BOTH-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = srem i32 7, [[EXTRACT]]
; IR-BOTH-NEXT: store i32 [[RES]], i32* %dest
; IR-BOTH-NEXT: ret
define void @undefRemCase(<2 x i32>* %addr1, i32* %dest) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 1
%out = srem i32 7, %extract
store i32 %out, i32* %dest, align 4
ret void
}
; Check that we use an undef mask for undefined behavior if the fast-math
; flag is set.
; IR-BOTH-LABEL: @undefConstantFRemCaseWithFastMath
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x float>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = frem nnan float [[EXTRACT]], 7.0
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = frem nnan <2 x float> [[LOAD]], <float undef, float 7.000000e+00>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store float [[RES]], float* %dest
; IR-BOTH-NEXT: ret
define void @undefConstantFRemCaseWithFastMath(<2 x float>* %addr1, float* %dest) {
%in1 = load <2 x float>* %addr1, align 8
%extract = extractelement <2 x float> %in1, i32 1
%out = frem nnan float %extract, 7.0
store float %out, float* %dest, align 4
ret void
}
; Check that we use an undef mask for undefined behavior if the fast-math
; flag is set.
; IR-BOTH-LABEL: @undefVectorFRemCaseWithFastMath
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x float>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = frem nnan float 7.000000e+00, [[EXTRACT]]
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = frem nnan <2 x float> <float undef, float 7.000000e+00>, [[LOAD]]
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store float [[RES]], float* %dest
; IR-BOTH-NEXT: ret
define void @undefVectorFRemCaseWithFastMath(<2 x float>* %addr1, float* %dest) {
%in1 = load <2 x float>* %addr1, align 8
%extract = extractelement <2 x float> %in1, i32 1
%out = frem nnan float 7.0, %extract
store float %out, float* %dest, align 4
ret void
}
; Check that we are able to promote floating point value.
; This requires the STRESS mode, as floating point value are
; not promote on armv7.
; IR-BOTH-LABEL: @simpleOneInstructionPromotionFloat
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x float>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = fadd float [[EXTRACT]], 1.0
; Vector version:
; IR-STRESS-NEXT: [[DIV:%[a-zA-Z_0-9-]+]] = fadd <2 x float> [[LOAD]], <float undef, float 1.000000e+00>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x float> [[DIV]], i32 1
;
; IR-BOTH-NEXT: store float [[RES]], float* %dest
; IR-BOTH-NEXT: ret
define void @simpleOneInstructionPromotionFloat(<2 x float>* %addr1, float* %dest) {
%in1 = load <2 x float>* %addr1, align 8
%extract = extractelement <2 x float> %in1, i32 1
%out = fadd float %extract, 1.0
store float %out, float* %dest, align 4
ret void
}
; Check that we correctly use a splat constant when we cannot
; determine at compile time the index of the extract.
; This requires the STRESS modes, as variable index are expensive
; to lower.
; IR-BOTH-LABEL: @simpleOneInstructionPromotionVariableIdx
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <2 x i32>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[LOAD]], i32 %idx
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = or i32 [[EXTRACT]], 1
; Vector version:
; IR-STRESS-NEXT: [[OR:%[a-zA-Z_0-9-]+]] = or <2 x i32> [[LOAD]], <i32 1, i32 1>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <2 x i32> [[OR]], i32 %idx
;
; IR-BOTH-NEXT: store i32 [[RES]], i32* %dest
; IR-BOTH-NEXT: ret
define void @simpleOneInstructionPromotionVariableIdx(<2 x i32>* %addr1, i32* %dest, i32 %idx) {
%in1 = load <2 x i32>* %addr1, align 8
%extract = extractelement <2 x i32> %in1, i32 %idx
%out = or i32 %extract, 1
store i32 %out, i32* %dest, align 4
ret void
}
; Check a vector with more than 2 elements.
; This requires the STRESS mode because currently 'or v8i8' is not marked
; as legal or custom, althought the actual assembly is better if we were
; promoting it.
; IR-BOTH-LABEL: @simpleOneInstructionPromotion8x8
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <8 x i8>* %addr1
; Scalar version:
; IR-NORMAL-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <8 x i8> [[LOAD]], i32 1
; IR-NORMAL-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = or i8 [[EXTRACT]], 1
; Vector version:
; IR-STRESS-NEXT: [[OR:%[a-zA-Z_0-9-]+]] = or <8 x i8> [[LOAD]], <i8 undef, i8 1, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef>
; IR-STRESS-NEXT: [[RES:%[a-zA-Z_0-9-]+]] = extractelement <8 x i8> [[OR]], i32 1
;
; IR-BOTH-NEXT: store i8 [[RES]], i8* %dest
; IR-BOTH-NEXT: ret
define void @simpleOneInstructionPromotion8x8(<8 x i8>* %addr1, i8* %dest) {
%in1 = load <8 x i8>* %addr1, align 8
%extract = extractelement <8 x i8> %in1, i32 1
%out = or i8 %extract, 1
store i8 %out, i8* %dest, align 4
ret void
}
; Check that we optimized the sequence correctly when it can be
; lowered on a Q register.
; IR-BOTH-LABEL: @simpleOneInstructionPromotion
; IR-BOTH: [[LOAD:%[a-zA-Z_0-9-]+]] = load <4 x i32>* %addr1
; IR-BOTH-NEXT: [[VECTOR_OR:%[a-zA-Z_0-9-]+]] = or <4 x i32> [[LOAD]], <i32 undef, i32 1, i32 undef, i32 undef>
; IR-BOTH-NEXT: [[EXTRACT:%[a-zA-Z_0-9-]+]] = extractelement <4 x i32> [[VECTOR_OR]], i32 1
; IR-BOTH-NEXT: store i32 [[EXTRACT]], i32* %dest
; IR-BOTH-NEXT: ret
;
; Make sure we got rid of any expensive vmov.32 instructions.
; ASM-LABEL: simpleOneInstructionPromotion4x32:
; ASM: vld1.64 {[[LOAD:d[0-9]+]], d{{[0-9]+}}}, [r0]
; The Q register used here must be [[LOAD]] / 2, but we cannot express that.
; ASM-NEXT: vorr.i32 q{{[[0-9]+}}, #0x1
; ASM-NEXT: vst1.32 {[[LOAD]][1]}, [r1]
; ASM-NEXT: bx
define void @simpleOneInstructionPromotion4x32(<4 x i32>* %addr1, i32* %dest) {
%in1 = load <4 x i32>* %addr1, align 8
%extract = extractelement <4 x i32> %in1, i32 1
%out = or i32 %extract, 1
store i32 %out, i32* %dest, align 1
ret void
}
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