RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-22 18:54:02 +01:00
Code Issues Projects Releases Wiki Activity
4ce16022d3
llvm-mirror/test/Transforms/InstCombine/shufflevec-bitcast.ll
Sanjay Patel 8343401f13 [InstCombine] canonicalize cast before unary shuffle 
We could go either direction on this transform. VectorCombine already goes this
way for bitcasts (and handles more complicated cases using the cost model), so
let's try cast-first.

Deferring completely to VectorCombine is another possibility. But the backend
should be able to invert this easily when the vectors have the same shape, so
it doesn't seem like a transform that we need to avoid.

The motivating example from https://llvm.org/PR49081 has an int-to-float
sandwiched between 2 shuffles, and the backend currently does not reduce that,
so on x86, we get something like:

  pshufd	$249, %xmm0, %xmm0]
  cvtdq2ps	%xmm0, %xmm0
  shufps	$144, %xmm0, %xmm0

...instead of just a single conversion instruction.

Differential Revision: https://reviews.llvm.org/D103038
2021-05-25 08:43:09 -04:00

239 lines
11 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
declare void @use(<4 x i16>)
define void @test(<16 x i8> %w, i32* %o1, float* %o2) {
; CHECK-LABEL: @test(
; CHECK-NEXT: [[V_BC:%.*]] = bitcast <16 x i8> [[W:%.*]] to <4 x i32>
; CHECK-NEXT: [[V_EXTRACT:%.*]] = extractelement <4 x i32> [[V_BC]], i32 3
; CHECK-NEXT: [[V_BC1:%.*]] = bitcast <16 x i8> [[W]] to <4 x float>
; CHECK-NEXT: [[V_EXTRACT2:%.*]] = extractelement <4 x float> [[V_BC1]], i32 3
; CHECK-NEXT: store i32 [[V_EXTRACT]], i32* [[O1:%.*]], align 4
; CHECK-NEXT: store float [[V_EXTRACT2]], float* [[O2:%.*]], align 4
; CHECK-NEXT: ret void
;
%v = shufflevector <16 x i8> %w, <16 x i8> undef, <4 x i32> <i32 12, i32 13, i32 14, i32 15>
%f = bitcast <4 x i8> %v to float
%i = bitcast <4 x i8> %v to i32
store i32 %i, i32* %o1, align 4
store float %f, float* %o2, align 4
ret void
}
; Shuffle-of-bitcast-splat --> splat-bitcast
define <4 x i16> @splat_bitcast_operand(<8 x i8> %x) {
; CHECK-LABEL: @splat_bitcast_operand(
; CHECK-NEXT: [[S1:%.*]] = shufflevector <8 x i8> [[X:%.*]], <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
; CHECK-NEXT: [[S2:%.*]] = bitcast <8 x i8> [[S1]] to <4 x i16>
; CHECK-NEXT: ret <4 x i16> [[S2]]
;
%s1 = shufflevector <8 x i8> %x, <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
%bc = bitcast <8 x i8> %s1 to <4 x i16>
%s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <4 x i32> <i32 0, i32 2, i32 1, i32 0>
ret <4 x i16> %s2
}
; Shuffle-of-bitcast-splat --> splat-bitcast
define <4 x i16> @splat_bitcast_operand_uses(<8 x i8> %x) {
; CHECK-LABEL: @splat_bitcast_operand_uses(
; CHECK-NEXT: [[S1:%.*]] = shufflevector <8 x i8> [[X:%.*]], <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
; CHECK-NEXT: [[BC:%.*]] = bitcast <8 x i8> [[S1]] to <4 x i16>
; CHECK-NEXT: call void @use(<4 x i16> [[BC]])
; CHECK-NEXT: [[S2:%.*]] = bitcast <8 x i8> [[S1]] to <4 x i16>
; CHECK-NEXT: ret <4 x i16> [[S2]]
;
%s1 = shufflevector <8 x i8> %x, <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
%bc = bitcast <8 x i8> %s1 to <4 x i16>
call void @use(<4 x i16> %bc)
%s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <4 x i32> <i32 0, i32 2, i32 1, i32 0>
ret <4 x i16> %s2
}
; Shuffle-of-bitcast-splat --> splat-bitcast
define <4 x i32> @splat_bitcast_operand_same_size_src_elt(<4 x float> %x) {
; CHECK-LABEL: @splat_bitcast_operand_same_size_src_elt(
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <4 x float> [[X:%.*]] to <4 x i32>
; CHECK-NEXT: [[BC:%.*]] = shufflevector <4 x i32> [[TMP1]], <4 x i32> undef, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
; CHECK-NEXT: ret <4 x i32> [[BC]]
;
%s1 = shufflevector <4 x float> %x, <4 x float> undef, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
%bc = bitcast <4 x float> %s1 to <4 x i32>
%s2 = shufflevector <4 x i32> %bc, <4 x i32> undef, <4 x i32> <i32 0, i32 2, i32 1, i32 0>
ret <4 x i32> %s2
}
; Scaled mask is inverse of first mask.
define <4 x i32> @shuf_bitcast_operand(<16 x i8> %x) {
; CHECK-LABEL: @shuf_bitcast_operand(
; CHECK-NEXT: [[S2:%.*]] = bitcast <16 x i8> [[X:%.*]] to <4 x i32>
; CHECK-NEXT: ret <4 x i32> [[S2]]
;
%s1 = shufflevector <16 x i8> %x, <16 x i8> undef, <16 x i32> <i32 12, i32 13, i32 14, i32 15, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
%bc = bitcast <16 x i8> %s1 to <4 x i32>
%s2 = shufflevector <4 x i32> %bc, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
ret <4 x i32> %s2
}
; TODO: Could allow fold for length-changing shuffles.
define <5 x i16> @splat_bitcast_operand_change_type(<8 x i8> %x) {
; CHECK-LABEL: @splat_bitcast_operand_change_type(
; CHECK-NEXT: [[S1:%.*]] = shufflevector <8 x i8> [[X:%.*]], <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
; CHECK-NEXT: [[BC:%.*]] = bitcast <8 x i8> [[S1]] to <4 x i16>
; CHECK-NEXT: [[S2:%.*]] = shufflevector <4 x i16> [[BC]], <4 x i16> undef, <5 x i32> <i32 0, i32 2, i32 1, i32 0, i32 3>
; CHECK-NEXT: ret <5 x i16> [[S2]]
;
%s1 = shufflevector <8 x i8> %x, <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
%bc = bitcast <8 x i8> %s1 to <4 x i16>
%s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <5 x i32> <i32 0, i32 2, i32 1, i32 0, i32 3>
ret <5 x i16> %s2
}
; Shuffle-of-bitcast-splat --> splat-bitcast
define <4 x i16> @splat_bitcast_operand_wider_src_elt(<2 x i32> %x) {
; CHECK-LABEL: @splat_bitcast_operand_wider_src_elt(
; CHECK-NEXT: [[S1:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> undef, <2 x i32> <i32 1, i32 1>
; CHECK-NEXT: [[S2:%.*]] = bitcast <2 x i32> [[S1]] to <4 x i16>
; CHECK-NEXT: ret <4 x i16> [[S2]]
;
%s1 = shufflevector <2 x i32> %x, <2 x i32> undef, <2 x i32> <i32 1, i32 1>
%bc = bitcast <2 x i32> %s1 to <4 x i16>
%s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
ret <4 x i16> %s2
}
; Shuffle-of-bitcast-splat --> splat-bitcast
define <4 x i16> @splat_bitcast_operand_wider_src_elt_uses(<2 x i32> %x) {
; CHECK-LABEL: @splat_bitcast_operand_wider_src_elt_uses(
; CHECK-NEXT: [[S1:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> undef, <2 x i32> <i32 1, i32 1>
; CHECK-NEXT: [[BC:%.*]] = bitcast <2 x i32> [[S1]] to <4 x i16>
; CHECK-NEXT: call void @use(<4 x i16> [[BC]])
; CHECK-NEXT: [[S2:%.*]] = bitcast <2 x i32> [[S1]] to <4 x i16>
; CHECK-NEXT: ret <4 x i16> [[S2]]
;
%s1 = shufflevector <2 x i32> %x, <2 x i32> undef, <2 x i32> <i32 1, i32 1>
%bc = bitcast <2 x i32> %s1 to <4 x i16>
call void @use(<4 x i16> %bc)
%s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
ret <4 x i16> %s2
}
; Scaled mask is inverse of first mask.
define <16 x i8> @shuf_bitcast_operand_wider_src(<4 x i32> %x) {
; CHECK-LABEL: @shuf_bitcast_operand_wider_src(
; CHECK-NEXT: [[S2:%.*]] = bitcast <4 x i32> [[X:%.*]] to <16 x i8>
; CHECK-NEXT: ret <16 x i8> [[S2]]
;
%s1 = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
%bc = bitcast <4 x i32> %s1 to <16 x i8>
%s2 = shufflevector <16 x i8> %bc, <16 x i8> undef, <16 x i32> <i32 12, i32 13, i32 14, i32 15, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
ret <16 x i8> %s2
}
; Negative test - the 2nd mask can't be widened
define <16 x i8> @shuf_bitcast_operand_cannot_widen(<4 x i32> %x) {
; CHECK-LABEL: @shuf_bitcast_operand_cannot_widen(
; CHECK-NEXT: [[S1:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: [[BC:%.*]] = bitcast <4 x i32> [[S1]] to <16 x i8>
; CHECK-NEXT: [[S2:%.*]] = shufflevector <16 x i8> [[BC]], <16 x i8> undef, <16 x i32> <i32 12, i32 13, i32 12, i32 13, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT: ret <16 x i8> [[S2]]
;
%s1 = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
%bc = bitcast <4 x i32> %s1 to <16 x i8>
%s2 = shufflevector <16 x i8> %bc, <16 x i8> undef, <16 x i32> <i32 12, i32 13, i32 12, i32 13, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
ret <16 x i8> %s2
}
; Negative test - the 2nd mask can't be widened
define <16 x i8> @shuf_bitcast_operand_cannot_widen_undef(<4 x i32> %x) {
; CHECK-LABEL: @shuf_bitcast_operand_cannot_widen_undef(
; CHECK-NEXT: [[S1:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: [[BC:%.*]] = bitcast <4 x i32> [[S1]] to <16 x i8>
; CHECK-NEXT: [[S2:%.*]] = shufflevector <16 x i8> [[BC]], <16 x i8> undef, <16 x i32> <i32 12, i32 undef, i32 14, i32 15, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT: ret <16 x i8> [[S2]]
;
%s1 = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
%bc = bitcast <4 x i32> %s1 to <16 x i8>
%s2 = shufflevector <16 x i8> %bc, <16 x i8> undef, <16 x i32> <i32 12, i32 undef, i32 14, i32 15, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
ret <16 x i8> %s2
}
define <2 x i4> @shuf_bitcast_insert(<2 x i8> %v, i8 %x) {
; CHECK-LABEL: @shuf_bitcast_insert(
; CHECK-NEXT: [[R:%.*]] = bitcast i8 [[X:%.*]] to <2 x i4>
; CHECK-NEXT: ret <2 x i4> [[R]]
;
%i = insertelement <2 x i8> %v, i8 %x, i32 0
%b = bitcast <2 x i8> %i to <4 x i4>
%r = shufflevector <4 x i4> %b, <4 x i4> undef, <2 x i32> <i32 0, i32 1>
ret <2 x i4> %r
}
define <2 x i4> @shuf_bitcast_inserti_use1(<2 x i8> %v, i8 %x, <2 x i8>* %p) {
; CHECK-LABEL: @shuf_bitcast_inserti_use1(
; CHECK-NEXT: [[I:%.*]] = insertelement <2 x i8> [[V:%.*]], i8 [[X:%.*]], i32 0
; CHECK-NEXT: store <2 x i8> [[I]], <2 x i8>* [[P:%.*]], align 2
; CHECK-NEXT: [[R:%.*]] = bitcast i8 [[X]] to <2 x i4>
; CHECK-NEXT: ret <2 x i4> [[R]]
;
%i = insertelement <2 x i8> %v, i8 %x, i32 0
store <2 x i8> %i, <2 x i8>* %p
%b = bitcast <2 x i8> %i to <4 x i4>
%r = shufflevector <4 x i4> %b, <4 x i4> undef, <2 x i32> <i32 0, i32 1>
ret <2 x i4> %r
}
define <2 x i4> @shuf_bitcast_insert_use2(<2 x i8> %v, i8 %x, <4 x i4>* %p) {
; CHECK-LABEL: @shuf_bitcast_insert_use2(
; CHECK-NEXT: [[I:%.*]] = insertelement <2 x i8> [[V:%.*]], i8 [[X:%.*]], i32 0
; CHECK-NEXT: [[TMP1:%.*]] = bitcast <4 x i4>* [[P:%.*]] to <2 x i8>*
; CHECK-NEXT: store <2 x i8> [[I]], <2 x i8>* [[TMP1]], align 4
; CHECK-NEXT: [[R:%.*]] = bitcast i8 [[X]] to <2 x i4>
; CHECK-NEXT: ret <2 x i4> [[R]]
;
%i = insertelement <2 x i8> %v, i8 %x, i32 0
%b = bitcast <2 x i8> %i to <4 x i4>
store <4 x i4> %b, <4 x i4>* %p
%r = shufflevector <4 x i4> %b, <4 x i4> undef, <2 x i32> <i32 0, i32 1>
ret <2 x i4> %r
}
; negative test - but demanded elements reduces this.
define <2 x i4> @shuf_bitcast_insert_wrong_index(<2 x i8> %v, i8 %x) {
; CHECK-LABEL: @shuf_bitcast_insert_wrong_index(
; CHECK-NEXT: [[B:%.*]] = bitcast <2 x i8> [[V:%.*]] to <4 x i4>
; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i4> [[B]], <4 x i4> undef, <2 x i32> <i32 0, i32 1>
; CHECK-NEXT: ret <2 x i4> [[R]]
;
%i = insertelement <2 x i8> %v, i8 %x, i32 1
%b = bitcast <2 x i8> %i to <4 x i4>
%r = shufflevector <4 x i4> %b, <4 x i4> undef, <2 x i32> <i32 0, i32 1>
ret <2 x i4> %r
}
; negative test
define <3 x i4> @shuf_bitcast_wrong_size(<2 x i8> %v, i8 %x) {
; CHECK-LABEL: @shuf_bitcast_wrong_size(
; CHECK-NEXT: [[I:%.*]] = insertelement <2 x i8> [[V:%.*]], i8 [[X:%.*]], i32 0
; CHECK-NEXT: [[B:%.*]] = bitcast <2 x i8> [[I]] to <4 x i4>
; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i4> [[B]], <4 x i4> undef, <3 x i32> <i32 0, i32 1, i32 2>
; CHECK-NEXT: ret <3 x i4> [[R]]
;
%i = insertelement <2 x i8> %v, i8 %x, i32 0
%b = bitcast <2 x i8> %i to <4 x i4>
%r = shufflevector <4 x i4> %b, <4 x i4> undef, <3 x i32> <i32 0, i32 1, i32 2>
ret <3 x i4> %r
}
Reference in New Issue View Git Blame Copy Permalink