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[PowerPC] Disable permuted SCALAR_TO_VECTOR on LE without direct moves 

There are some patterns involving the permuted scalar to vector node
for which we don't have patterns without direct moves on little endian
subtargets. This causes selection errors. While we can of course add
the missing patterns, any additional effort to make this work is not
useful since there is no support for any CPU that can run in
little endian mode and does not support direct moves.
This commit is contained in:
Nemanja Ivanovic 2021-07-07 13:38:47 -05:00
parent 84c15bc018
commit 6a06dbafa1
3 changed files with 108 additions and 19 deletions
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10
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
View File

@ -14496,10 +14496,12 @@ SDValue PPCTargetLowering::combineVectorShuffle(ShuffleVectorSDNode *SVN,
SDLoc dl(SVN);
bool IsLittleEndian = Subtarget.isLittleEndian();
// On little endian targets, do these combines on all VSX targets since
// canonical shuffles match efficient permutes. On big endian targets,
// this is only useful for targets with direct moves.
if (!Subtarget.hasDirectMove() && !(IsLittleEndian && Subtarget.hasVSX()))
// On big endian targets this is only useful for subtargets with direct moves.
// On little endian targets it would be useful for all subtargets with VSX.
// However adding special handling for LE subtargets without direct moves
// would be wasted effort since the minimum arch for LE is ISA 2.07 (Power8)
// which includes direct moves.
if (!Subtarget.hasDirectMove())
return Res;
// If this is not a shuffle of a shuffle and the first element comes from

109
llvm/test/CodeGen/PowerPC/canonical-merge-shuffles.ll
View File

@ -70,7 +70,10 @@ define dso_local <16 x i8> @testmrghb2(<16 x i8> %a, <16 x i8> %b) local_unnamed
;
; CHECK-P7-LABEL: testmrghb2:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: vmrghb v2, v2, v3
; CHECK-P7-NEXT: addis r3, r2, .LCPI1_0@toc@ha
; CHECK-P7-NEXT: addi r3, r3, .LCPI1_0@toc@l
; CHECK-P7-NEXT: lvx v4, 0, r3
; CHECK-P7-NEXT: vperm v2, v3, v2, v4
; CHECK-P7-NEXT: blr
entry:
%shuffle = shufflevector <16 x i8> %a, <16 x i8> %b, <16 x i32> <i32 24, i32 8, i32 25, i32 9, i32 26, i32 10, i32 27, i32 11, i32 28, i32 12, i32 29, i32 13, i32 30, i32 14, i32 31, i32 15>
@ -131,7 +134,10 @@ define dso_local <16 x i8> @testmrghh2(<16 x i8> %a, <16 x i8> %b) local_unnamed
;
; CHECK-P7-LABEL: testmrghh2:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: vmrghh v2, v2, v3
; CHECK-P7-NEXT: addis r3, r2, .LCPI3_0@toc@ha
; CHECK-P7-NEXT: addi r3, r3, .LCPI3_0@toc@l
; CHECK-P7-NEXT: lvx v4, 0, r3
; CHECK-P7-NEXT: vperm v2, v3, v2, v4
; CHECK-P7-NEXT: blr
entry:
%shuffle = shufflevector <16 x i8> %a, <16 x i8> %b, <16 x i32> <i32 24, i32 25, i32 8, i32 9, i32 26, i32 27, i32 10, i32 11, i32 28, i32 29, i32 12, i32 13, i32 30, i32 31, i32 14, i32 15>
@ -192,7 +198,10 @@ define dso_local <16 x i8> @testmrglb2(<16 x i8> %a, <16 x i8> %b) local_unnamed
;
; CHECK-P7-LABEL: testmrglb2:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: vmrglb v2, v2, v3
; CHECK-P7-NEXT: addis r3, r2, .LCPI5_0@toc@ha
; CHECK-P7-NEXT: addi r3, r3, .LCPI5_0@toc@l
; CHECK-P7-NEXT: lvx v4, 0, r3
; CHECK-P7-NEXT: vperm v2, v3, v2, v4
; CHECK-P7-NEXT: blr
entry:
%shuffle = shufflevector <16 x i8> %a, <16 x i8> %b, <16 x i32> <i32 16, i32 0, i32 17, i32 1, i32 18, i32 2, i32 19, i32 3, i32 20, i32 4, i32 21, i32 5, i32 22, i32 6, i32 23, i32 7>
@ -253,7 +262,10 @@ define dso_local <16 x i8> @testmrglh2(<16 x i8> %a, <16 x i8> %b) local_unnamed
;
; CHECK-P7-LABEL: testmrglh2:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: vmrglh v2, v2, v3
; CHECK-P7-NEXT: addis r3, r2, .LCPI7_0@toc@ha
; CHECK-P7-NEXT: addi r3, r3, .LCPI7_0@toc@l
; CHECK-P7-NEXT: lvx v4, 0, r3
; CHECK-P7-NEXT: vperm v2, v3, v2, v4
; CHECK-P7-NEXT: blr
entry:
%shuffle = shufflevector <16 x i8> %a, <16 x i8> %b, <16 x i32> <i32 16, i32 17, i32 0, i32 1, i32 18, i32 19, i32 2, i32 3, i32 20, i32 21, i32 4, i32 5, i32 22, i32 23, i32 6, i32 7>
@ -314,7 +326,10 @@ define dso_local <16 x i8> @testmrghw2(<16 x i8> %a, <16 x i8> %b) local_unnamed
;
; CHECK-P7-LABEL: testmrghw2:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: vmrghw v2, v2, v3
; CHECK-P7-NEXT: addis r3, r2, .LCPI9_0@toc@ha
; CHECK-P7-NEXT: addi r3, r3, .LCPI9_0@toc@l
; CHECK-P7-NEXT: lvx v4, 0, r3
; CHECK-P7-NEXT: vperm v2, v3, v2, v4
; CHECK-P7-NEXT: blr
entry:
%shuffle = shufflevector <16 x i8> %a, <16 x i8> %b, <16 x i32> <i32 24, i32 25, i32 26, i32 27, i32 8, i32 9, i32 10, i32 11, i32 28, i32 29, i32 30, i32 31, i32 12, i32 13, i32 14, i32 15>
@ -375,7 +390,10 @@ define dso_local <16 x i8> @testmrglw2(<16 x i8> %a, <16 x i8> %b) local_unnamed
;
; CHECK-P7-LABEL: testmrglw2:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: vmrglw v2, v2, v3
; CHECK-P7-NEXT: addis r3, r2, .LCPI11_0@toc@ha
; CHECK-P7-NEXT: addi r3, r3, .LCPI11_0@toc@l
; CHECK-P7-NEXT: lvx v4, 0, r3
; CHECK-P7-NEXT: vperm v2, v3, v2, v4
; CHECK-P7-NEXT: blr
entry:
%shuffle = shufflevector <16 x i8> %a, <16 x i8> %b, <16 x i32> <i32 16, i32 17, i32 18, i32 19, i32 0, i32 1, i32 2, i32 3, i32 20, i32 21, i32 22, i32 23, i32 4, i32 5, i32 6, i32 7>
@ -422,9 +440,16 @@ define dso_local <8 x i16> @testmrglb3(<8 x i8>* nocapture readonly %a) local_un
;
; CHECK-P7-LABEL: testmrglb3:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: lxsdx v2, 0, r3
; CHECK-P7-NEXT: xxlxor v3, v3, v3
; CHECK-P7-NEXT: vmrghb v2, v3, v2
; CHECK-P7-NEXT: ld r3, 0(r3)
; CHECK-P7-NEXT: addi r4, r1, -16
; CHECK-P7-NEXT: xxlxor v4, v4, v4
; CHECK-P7-NEXT: std r3, -16(r1)
; CHECK-P7-NEXT: addis r3, r2, .LCPI12_0@toc@ha
; CHECK-P7-NEXT: lxvd2x vs0, 0, r4
; CHECK-P7-NEXT: addi r3, r3, .LCPI12_0@toc@l
; CHECK-P7-NEXT: lvx v3, 0, r3
; CHECK-P7-NEXT: xxswapd v2, vs0
; CHECK-P7-NEXT: vperm v2, v2, v4, v3
; CHECK-P7-NEXT: blr
entry:
%0 = load <8 x i8>, <8 x i8>* %a, align 8
@ -706,8 +731,12 @@ define dso_local <4 x i32> @testSplat4Low(<8 x i8>* nocapture readonly %ptr) loc
;
; CHECK-P7-LABEL: testSplat4Low:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: lfdx f0, 0, r3
; CHECK-P7-NEXT: xxspltw v2, vs0, 0
; CHECK-P7-NEXT: ld r3, 0(r3)
; CHECK-P7-NEXT: addi r4, r1, -16
; CHECK-P7-NEXT: std r3, -16(r1)
; CHECK-P7-NEXT: lxvd2x vs0, 0, r4
; CHECK-P7-NEXT: xxswapd v2, vs0
; CHECK-P7-NEXT: xxspltw v2, v2, 2
; CHECK-P7-NEXT: blr
entry:
%0 = load <8 x i8>, <8 x i8>* %ptr, align 8
@ -745,8 +774,12 @@ define dso_local <4 x i32> @testSplat4hi(<8 x i8>* nocapture readonly %ptr) loca
;
; CHECK-P7-LABEL: testSplat4hi:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: lfdx f0, 0, r3
; CHECK-P7-NEXT: xxspltw v2, vs0, 1
; CHECK-P7-NEXT: ld r3, 0(r3)
; CHECK-P7-NEXT: addi r4, r1, -16
; CHECK-P7-NEXT: std r3, -16(r1)
; CHECK-P7-NEXT: lxvd2x vs0, 0, r4
; CHECK-P7-NEXT: xxswapd v2, vs0
; CHECK-P7-NEXT: xxspltw v2, v2, 3
; CHECK-P7-NEXT: blr
entry:
%0 = load <8 x i8>, <8 x i8>* %ptr, align 8
@ -795,5 +828,55 @@ entry:
ret <2 x i64> %1
}
define dso_local void @testByteSplat() #0 {
; CHECK-P8-LABEL: testByteSplat:
; CHECK-P8: # %bb.0: # %entry
; CHECK-P8-NEXT: lbz r3, 0(r3)
; CHECK-P8-NEXT: mtvsrd v2, r3
; CHECK-P8-NEXT: vspltb v2, v2, 7
; CHECK-P8-NEXT: stvx v2, 0, r3
; CHECK-P8-NEXT: blr
;
; CHECK-P9-LABEL: testByteSplat:
; CHECK-P9: # %bb.0: # %entry
; CHECK-P9-NEXT: lxsibzx v2, 0, r3
; CHECK-P9-NEXT: vspltb v2, v2, 7
; CHECK-P9-NEXT: stxvx v2, 0, r3
; CHECK-P9-NEXT: blr
;
; CHECK-P9-BE-LABEL: testByteSplat:
; CHECK-P9-BE: # %bb.0: # %entry
; CHECK-P9-BE-NEXT: lxsibzx v2, 0, r3
; CHECK-P9-BE-NEXT: vspltb v2, v2, 7
; CHECK-P9-BE-NEXT: stxvx v2, 0, r3
; CHECK-P9-BE-NEXT: blr
;
; CHECK-NOVSX-LABEL: testByteSplat:
; CHECK-NOVSX: # %bb.0: # %entry
; CHECK-NOVSX-NEXT: lbz r3, 0(r3)
; CHECK-NOVSX-NEXT: stb r3, -16(r1)
; CHECK-NOVSX-NEXT: addi r3, r1, -16
; CHECK-NOVSX-NEXT: lvx v2, 0, r3
; CHECK-NOVSX-NEXT: vspltb v2, v2, 15
; CHECK-NOVSX-NEXT: stvx v2, 0, r3
; CHECK-NOVSX-NEXT: blr
;
; CHECK-P7-LABEL: testByteSplat:
; CHECK-P7: # %bb.0: # %entry
; CHECK-P7-NEXT: lbz r3, 0(r3)
; CHECK-P7-NEXT: stb r3, -16(r1)
; CHECK-P7-NEXT: addi r3, r1, -16
; CHECK-P7-NEXT: lvx v2, 0, r3
; CHECK-P7-NEXT: vspltb v2, v2, 15
; CHECK-P7-NEXT: stvx v2, 0, r3
; CHECK-P7-NEXT: blr
entry:
%0 = load i8, i8* undef, align 1
%splat.splatinsert.i = insertelement <16 x i8> poison, i8 %0, i32 0
%splat.splat.i = shufflevector <16 x i8> %splat.splatinsert.i, <16 x i8> poison, <16 x i32> zeroinitializer
store <16 x i8> %splat.splat.i, <16 x i8>* undef, align 16
ret void
}
declare double @dummy() local_unnamed_addr
attributes #0 = { nounwind }

8
llvm/test/CodeGen/PowerPC/pr47916.ll
View File

@ -4,8 +4,12 @@
define dso_local void @_Z1jjPiPj() local_unnamed_addr #0 {
; CHECK-LABEL: _Z1jjPiPj:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: lxsdx v2, 0, r3
; CHECK-NEXT: vmrghw v2, v2, v2
; CHECK-NEXT: ld r3, 0(r3)
; CHECK-NEXT: std r3, -16(r1)
; CHECK-NEXT: addi r3, r1, -16
; CHECK-NEXT: lxvd2x vs0, 0, r3
; CHECK-NEXT: xxswapd v2, vs0
; CHECK-NEXT: vmrglw v2, v2, v2
; CHECK-NEXT: xxswapd vs0, v2
; CHECK-NEXT: stxvd2x vs0, 0, r3
; CHECK-NEXT: blr