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[PowerPC] Select the D-Form load if we know its offset meets the requirement 

The LD/STD likewise instruction are selected only when the alignment in
the load/store >= 4 to deal with the case that the offset might not be
known(i.e. relocations). That means we have to select the X-Form load
for %0 = load i64, i64* %arrayidx, align 2 In fact, we can still select
the D-Form load if the offset is known. So, we only query the load/store
alignment when we don't know if the offset is a multiple of 4.

Reviewed By: jji, Nemanjai

Differential Revision: https://reviews.llvm.org/D93099
This commit is contained in:
QingShan Zhang 2020-12-18 07:27:26 +00:00
parent 4b388859f5
commit 477b6505fa
9 changed files with 44 additions and 42 deletions
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14
llvm/lib/Target/PowerPC/PPCInstr64Bit.td
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@ -1062,7 +1062,7 @@ def LHA8: DForm_1<42, (outs g8rc:$rD), (ins memri:$src),
def LWA : DSForm_1<58, 2, (outs g8rc:$rD), (ins memrix:$src),
"lwa $rD, $src", IIC_LdStLWA,
[(set i64:$rD,
(aligned4sextloadi32 iaddrX4:$src))]>, isPPC64,
(DSFormSextLoadi32 iaddrX4:$src))]>, isPPC64,
PPC970_DGroup_Cracked;
let Interpretation64Bit = 1, isCodeGenOnly = 1 in
def LHAX8: XForm_1_memOp<31, 343, (outs g8rc:$rD), (ins memrr:$src),
@ -1173,7 +1173,7 @@ def LWZUX8 : XForm_1_memOp<31, 55, (outs g8rc:$rD, ptr_rc_nor0:$ea_result),
let PPC970_Unit = 2 in {
def LD : DSForm_1<58, 0, (outs g8rc:$rD), (ins memrix:$src),
"ld $rD, $src", IIC_LdStLD,
[(set i64:$rD, (aligned4load iaddrX4:$src))]>, isPPC64;
[(set i64:$rD, (DSFormLoad iaddrX4:$src))]>, isPPC64;
// The following four definitions are selected for small code model only.
// Otherwise, we need to create two instructions to form a 32-bit offset,
// so we have a custom matcher for TOC_ENTRY in PPCDAGToDAGIsel::Select().
@ -1380,7 +1380,7 @@ def STWX8 : XForm_8_memOp<31, 151, (outs), (ins g8rc:$rS, memrr:$dst),
// Normal 8-byte stores.
def STD : DSForm_1<62, 0, (outs), (ins g8rc:$rS, memrix:$dst),
"std $rS, $dst", IIC_LdStSTD,
[(aligned4store i64:$rS, iaddrX4:$dst)]>, isPPC64;
[(DSFormStore i64:$rS, iaddrX4:$dst)]>, isPPC64;
def STDX : XForm_8_memOp<31, 149, (outs), (ins g8rc:$rS, memrr:$dst),
"stdx $rS, $dst", IIC_LdStSTD,
[(store i64:$rS, xaddrX4:$dst)]>, isPPC64,
@ -1447,7 +1447,7 @@ def : Pat<(pre_truncsti16 i64:$rS, iPTR:$ptrreg, iaddroff:$ptroff),
(STHU8 $rS, iaddroff:$ptroff, $ptrreg)>;
def : Pat<(pre_truncsti32 i64:$rS, iPTR:$ptrreg, iaddroff:$ptroff),
(STWU8 $rS, iaddroff:$ptroff, $ptrreg)>;
def : Pat<(aligned4pre_store i64:$rS, iPTR:$ptrreg, iaddroff:$ptroff),
def : Pat<(DSFormPreStore i64:$rS, iPTR:$ptrreg, iaddroff:$ptroff),
(STDU $rS, iaddroff:$ptroff, $ptrreg)>;
def : Pat<(pre_truncsti8 i64:$rS, iPTR:$ptrreg, iPTR:$ptroff),
@ -1591,11 +1591,11 @@ def : Pat<(add i64:$in, (PPChi tblockaddress:$g, 0)),
// Patterns to match r+r indexed loads and stores for
// addresses without at least 4-byte alignment.
def : Pat<(i64 (unaligned4sextloadi32 xoaddr:$src)),
def : Pat<(i64 (NonDSFormSextLoadi32 xoaddr:$src)),
(LWAX xoaddr:$src)>;
def : Pat<(i64 (unaligned4load xoaddr:$src)),
def : Pat<(i64 (NonDSFormLoad xoaddr:$src)),
(LDX xoaddr:$src)>;
def : Pat<(unaligned4store i64:$rS, xoaddr:$dst),
def : Pat<(NonDSFormStore i64:$rS, xoaddr:$dst),
(STDX $rS, xoaddr:$dst)>;
// 64-bits atomic loads and stores

34
llvm/lib/Target/PowerPC/PPCInstrInfo.td
View File

@ -495,37 +495,41 @@ def imm64ZExt32 : Operand<i64>, ImmLeaf<i64, [{
return isUInt<32>(Imm);
}]>;
// Some r+i load/store instructions (such as LD, STD, LDU, etc.) that require
// This is a somewhat weaker condition than actually checking for 4-byte
// alignment. It is simply checking that the displacement can be represented
// as an immediate that is a multiple of 4 (i.e. the requirements for DS-Form
// instructions).
// But some r+i load/store instructions (such as LD, STD, LDU, etc.) that require
// restricted memrix (4-aligned) constants are alignment sensitive. If these
// offsets are hidden behind TOC entries than the values of the lower-order
// bits cannot be checked directly. As a result, we need to also incorporate
// an alignment check into the relevant patterns.
def aligned4load : PatFrag<(ops node:$ptr), (load node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() >= 4;
def DSFormLoad : PatFrag<(ops node:$ptr), (load node:$ptr), [{
return isOffsetMultipleOf(N, 4) || cast<LoadSDNode>(N)->getAlignment() >= 4;
}]>;
def aligned4store : PatFrag<(ops node:$val, node:$ptr),
def DSFormStore : PatFrag<(ops node:$val, node:$ptr),
(store node:$val, node:$ptr), [{
return cast<StoreSDNode>(N)->getAlignment() >= 4;
return isOffsetMultipleOf(N, 4) || cast<StoreSDNode>(N)->getAlignment() >= 4;
}]>;
def aligned4sextloadi32 : PatFrag<(ops node:$ptr), (sextloadi32 node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() >= 4;
def DSFormSextLoadi32 : PatFrag<(ops node:$ptr), (sextloadi32 node:$ptr), [{
return isOffsetMultipleOf(N, 4) || cast<LoadSDNode>(N)->getAlignment() >= 4;
}]>;
def aligned4pre_store : PatFrag<
def DSFormPreStore : PatFrag<
(ops node:$val, node:$base, node:$offset),
(pre_store node:$val, node:$base, node:$offset), [{
return cast<StoreSDNode>(N)->getAlignment() >= 4;
return isOffsetMultipleOf(N, 4) || cast<StoreSDNode>(N)->getAlignment() >= 4;
}]>;
def unaligned4load : PatFrag<(ops node:$ptr), (load node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() < 4;
def NonDSFormLoad : PatFrag<(ops node:$ptr), (load node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() < 4 && !isOffsetMultipleOf(N, 4);
}]>;
def unaligned4store : PatFrag<(ops node:$val, node:$ptr),
def NonDSFormStore : PatFrag<(ops node:$val, node:$ptr),
(store node:$val, node:$ptr), [{
return cast<StoreSDNode>(N)->getAlignment() < 4;
return cast<StoreSDNode>(N)->getAlignment() < 4 && !isOffsetMultipleOf(N, 4);
}]>;
def unaligned4sextloadi32 : PatFrag<(ops node:$ptr), (sextloadi32 node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() < 4;
def NonDSFormSextLoadi32 : PatFrag<(ops node:$ptr), (sextloadi32 node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() < 4 && !isOffsetMultipleOf(N, 4);
}]>;
// This is a somewhat weaker condition than actually checking for 16-byte

8
llvm/test/CodeGen/PowerPC/ldst-align.ll
View File

@ -6,9 +6,8 @@ define i64 @load(i64* %p) {
; CHECK: bb.0.entry:
; CHECK: liveins: $x3
; CHECK: [[COPY:%[0-9]+]]:g8rc_and_g8rc_nox0 = COPY $x3
; CHECK: [[ADDI8_:%[0-9]+]]:g8rc = nuw ADDI8 [[COPY]], 24
; CHECK: [[LDX:%[0-9]+]]:g8rc = LDX $zero8, killed [[ADDI8_]] :: (load 8 from %ir.arrayidx, align 2)
; CHECK: $x3 = COPY [[LDX]]
; CHECK: [[LD:%[0-9]+]]:g8rc = LD 24, [[COPY]] :: (load 8 from %ir.arrayidx, align 2)
; CHECK: $x3 = COPY [[LD]]
; CHECK: BLR8 implicit $lr8, implicit $rm, implicit $x3
entry:
%arrayidx = getelementptr inbounds i64, i64* %p, i64 3
@ -21,9 +20,8 @@ define void @store(i64* %p) {
; CHECK: bb.0.entry:
; CHECK: liveins: $x3
; CHECK: [[COPY:%[0-9]+]]:g8rc_and_g8rc_nox0 = COPY $x3
; CHECK: [[ADDI8_:%[0-9]+]]:g8rc = nuw ADDI8 [[COPY]], 16
; CHECK: [[LI8_:%[0-9]+]]:g8rc = LI8 9
; CHECK: STDX killed [[LI8_]], $zero8, killed [[ADDI8_]] :: (store 8 into %ir.arrayidx, align 1)
; CHECK: STD killed [[LI8_]], 16, [[COPY]] :: (store 8 into %ir.arrayidx, align 1)
; CHECK: BLR8 implicit $lr8, implicit $rm
entry:
%arrayidx = getelementptr inbounds i64, i64* %p, i64 2

6
llvm/test/CodeGen/PowerPC/memCmpUsedInZeroEqualityComparison.ll
View File

@ -35,8 +35,8 @@ define signext i32 @zeroEqualityTest02(i8* %x, i8* %y) {
define signext i32 @zeroEqualityTest01(i8* %x, i8* %y) {
; CHECK-LABEL: zeroEqualityTest01:
; CHECK: # %bb.0:
; CHECK-NEXT: ldx 5, 0, 3
; CHECK-NEXT: ldx 6, 0, 4
; CHECK-NEXT: ld 5, 0(3)
; CHECK-NEXT: ld 6, 0(4)
; CHECK-NEXT: cmpld 5, 6
; CHECK-NEXT: bne 0, .LBB1_2
; CHECK-NEXT: # %bb.1: # %loadbb1
@ -125,7 +125,7 @@ define signext i32 @equalityFoldTwoConstants() {
define signext i32 @equalityFoldOneConstant(i8* %X) {
; CHECK-LABEL: equalityFoldOneConstant:
; CHECK: # %bb.0:
; CHECK-NEXT: ldx 4, 0, 3
; CHECK-NEXT: ld 4, 0(3)
; CHECK-NEXT: li 5, 1
; CHECK-NEXT: sldi 5, 5, 32
; CHECK-NEXT: cmpld 4, 5

4
llvm/test/CodeGen/PowerPC/memcmp-mergeexpand.ll
View File

@ -8,8 +8,8 @@
define zeroext i1 @opeq1(
; PPC64LE-LABEL: opeq1:
; PPC64LE: # %bb.0: # %"entry+land.rhs.i"
; PPC64LE-NEXT: ldx 3, 0, 3
; PPC64LE-NEXT: ldx 4, 0, 4
; PPC64LE-NEXT: ld 3, 0(3)
; PPC64LE-NEXT: ld 4, 0(4)
; PPC64LE-NEXT: xor 3, 3, 4
; PPC64LE-NEXT: cntlzd 3, 3
; PPC64LE-NEXT: rldicl 3, 3, 58, 63

2
llvm/test/CodeGen/PowerPC/pr45186.ll
View File

@ -9,7 +9,7 @@
define i64 @e(i8* nocapture readonly %f) local_unnamed_addr #0 {
; CHECK-LABEL: e:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: ldx r3, 0, r3
; CHECK-NEXT: ld r3, 0(r3)
; CHECK-NEXT: blr
entry:
%0 = load i8, i8* %f, align 1

6
llvm/test/CodeGen/PowerPC/store-combine.ll
View File

@ -80,7 +80,7 @@ entry:
define void @store_i64_by_i8(i64 %m, i8* %p) {
; CHECK-PPC64LE-LABEL: store_i64_by_i8:
; CHECK-PPC64LE: # %bb.0: # %entry
; CHECK-PPC64LE-NEXT: stdx 3, 0, 4
; CHECK-PPC64LE-NEXT: std 3, 0(4)
; CHECK-PPC64LE-NEXT: blr
;
; CHECK-PPC64-LABEL: store_i64_by_i8:
@ -138,7 +138,7 @@ define void @store_i64_by_i8_bswap(i64 %m, i8* %p) {
;
; CHECK-PPC64-LABEL: store_i64_by_i8_bswap:
; CHECK-PPC64: # %bb.0: # %entry
; CHECK-PPC64-NEXT: stdx 3, 0, 4
; CHECK-PPC64-NEXT: std 3, 0(4)
; CHECK-PPC64-NEXT: blr
entry:
%conv = trunc i64 %m to i8
@ -198,7 +198,7 @@ define void @store_i64_by_i8_bswap_uses(i32 signext %t, i8* %p) {
; CHECK-PPC64-NEXT: slwi 5, 3, 3
; CHECK-PPC64-NEXT: sub 3, 5, 3
; CHECK-PPC64-NEXT: extsw 3, 3
; CHECK-PPC64-NEXT: stdx 3, 0, 4
; CHECK-PPC64-NEXT: std 3, 0(4)
; CHECK-PPC64-NEXT: blr
entry:
%mul = mul nsw i32 %t, 7

2
llvm/test/CodeGen/PowerPC/unal4-std.ll
View File

@ -13,7 +13,7 @@ define void @copy_to_conceal(<8 x i16>* %inp) #0 {
; CHECK-NEXT: ld 4, -8(1)
; CHECK-NEXT: std 4, 8(3)
; CHECK-NEXT: ld 4, -16(1)
; CHECK-NEXT: stdx 4, 0, 3
; CHECK-NEXT: std 4, 0(3)
; CHECK-NEXT: blr
;
; CHECK-VSX-LABEL: copy_to_conceal:

10
llvm/test/CodeGen/PowerPC/unaligned.ll
View File

@ -46,14 +46,14 @@ entry:
define void @foo3(i64* %p, i64* %r) nounwind {
; CHECK-LABEL: foo3:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: ldx 3, 0, 3
; CHECK-NEXT: stdx 3, 0, 4
; CHECK-NEXT: ld 3, 0(3)
; CHECK-NEXT: std 3, 0(4)
; CHECK-NEXT: blr
;
; CHECK-VSX-LABEL: foo3:
; CHECK-VSX: # %bb.0: # %entry
; CHECK-VSX-NEXT: ldx 3, 0, 3
; CHECK-VSX-NEXT: stdx 3, 0, 4
; CHECK-VSX-NEXT: ld 3, 0(3)
; CHECK-VSX-NEXT: std 3, 0(4)
; CHECK-VSX-NEXT: blr
entry:
%v = load i64, i64* %p, align 1
@ -118,7 +118,7 @@ define void @foo6(<4 x float>* %p, <4 x float>* %r) nounwind {
; CHECK-NEXT: ld 3, -8(1)
; CHECK-NEXT: std 3, 8(4)
; CHECK-NEXT: ld 3, -16(1)
; CHECK-NEXT: stdx 3, 0, 4
; CHECK-NEXT: std 3, 0(4)
; CHECK-NEXT: blr
;
; CHECK-VSX-LABEL: foo6: