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Use vld1/vst1 to load/store f64 if alignment is < 4 and the target allows unaligned access. rdar://12091029

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llvm-svn: 161962
This commit is contained in:
Evan Cheng 2012-08-15 17:44:53 +00:00
parent a39979db7d
commit 625c0ca5ee
5 changed files with 98 additions and 18 deletions
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2
lib/Target/ARM/ARMISelLowering.cpp
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@ -8808,6 +8808,8 @@ bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
case MVT::i16:
case MVT::i32:
return true;
case MVT::f64:
return Subtarget->hasNEON();
// FIXME: VLD1 etc with standard alignment is legal.
}
}

3
lib/Target/ARM/ARMInstrInfo.td
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@ -242,6 +242,9 @@ def UseFusedMAC : Predicate<"(TM.Options.AllowFPOpFusion =="
def DontUseFusedMAC : Predicate<"!Subtarget->hasVFP4() || "
"Subtarget->isTargetDarwin()">;
def IsLE : Predicate<"TLI.isLittleEndian()">;
def IsBE : Predicate<"TLI.isBigEndian()">;
//===----------------------------------------------------------------------===//
// ARM Flag Definitions.

34
lib/Target/ARM/ARMInstrNEON.td
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@ -398,6 +398,27 @@ def VecListFourQWordIndexed : Operand<i32> {
let MIOperandInfo = (ops DPR:$Vd, i32imm:$idx);
}
def hword_alignedload : PatFrag<(ops node:$ptr), (load node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() == 2;
}]>;
def hword_alignedstore : PatFrag<(ops node:$val, node:$ptr),
(store node:$val, node:$ptr), [{
return cast<StoreSDNode>(N)->getAlignment() == 2;
}]>;
def byte_alignedload : PatFrag<(ops node:$ptr), (load node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() == 1;
}]>;
def byte_alignedstore : PatFrag<(ops node:$val, node:$ptr),
(store node:$val, node:$ptr), [{
return cast<StoreSDNode>(N)->getAlignment() == 1;
}]>;
def non_word_alignedload : PatFrag<(ops node:$ptr), (load node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() < 4;
}]>;
def non_word_alignedstore : PatFrag<(ops node:$val, node:$ptr),
(store node:$val, node:$ptr), [{
return cast<StoreSDNode>(N)->getAlignment() < 4;
}]>;
//===----------------------------------------------------------------------===//
// NEON-specific DAG Nodes.
@ -2238,6 +2259,19 @@ def VST4LNq32Pseudo_UPD : VSTQQQQLNWBPseudo<IIC_VST4lnu>;
} // mayStore = 1, neverHasSideEffects = 1, hasExtraSrcRegAllocReq = 1
// Use vld1/vst1 for unaligned f64 load / store
def : Pat<(f64 (hword_alignedload addrmode6:$addr)),
(VLD1d16 addrmode6:$addr)>, Requires<[IsLE]>;
def : Pat<(hword_alignedstore (f64 DPR:$value), addrmode6:$addr),
(VST1d16 addrmode6:$addr, DPR:$value)>, Requires<[IsLE]>;
def : Pat<(f64 (byte_alignedload addrmode6:$addr)),
(VLD1d8 addrmode6:$addr)>, Requires<[IsLE]>;
def : Pat<(byte_alignedstore (f64 DPR:$value), addrmode6:$addr),
(VST1d8 addrmode6:$addr, DPR:$value)>, Requires<[IsLE]>;
def : Pat<(f64 (non_word_alignedload addrmode6:$addr)),
(VLD1d64 addrmode6:$addr)>, Requires<[IsBE]>;
def : Pat<(non_word_alignedstore (f64 DPR:$value), addrmode6:$addr),
(VST1d64 addrmode6:$addr, DPR:$value)>, Requires<[IsBE]>;
//===----------------------------------------------------------------------===//
// NEON pattern fragments

13
lib/Target/ARM/ARMInstrVFP.td
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@ -61,6 +61,15 @@ def vfp_f64imm : Operand<f64>,
let ParserMatchClass = FPImmOperand;
}
def alignedload32 : PatFrag<(ops node:$ptr), (load node:$ptr), [{
return cast<LoadSDNode>(N)->getAlignment() >= 4;
}]>;
def alignedstore32 : PatFrag<(ops node:$val, node:$ptr),
(store node:$val, node:$ptr), [{
return cast<StoreSDNode>(N)->getAlignment() >= 4;
}]>;
// The VCVT to/from fixed-point instructions encode the 'fbits' operand
// (the number of fixed bits) differently than it appears in the assembly
// source. It's encoded as "Size - fbits" where Size is the size of the
@ -86,7 +95,7 @@ let canFoldAsLoad = 1, isReMaterializable = 1 in {
def VLDRD : ADI5<0b1101, 0b01, (outs DPR:$Dd), (ins addrmode5:$addr),
IIC_fpLoad64, "vldr", "\t$Dd, $addr",
[(set DPR:$Dd, (f64 (load addrmode5:$addr)))]>;
[(set DPR:$Dd, (f64 (alignedload32 addrmode5:$addr)))]>;
def VLDRS : ASI5<0b1101, 0b01, (outs SPR:$Sd), (ins addrmode5:$addr),
IIC_fpLoad32, "vldr", "\t$Sd, $addr",
@ -100,7 +109,7 @@ def VLDRS : ASI5<0b1101, 0b01, (outs SPR:$Sd), (ins addrmode5:$addr),
def VSTRD : ADI5<0b1101, 0b00, (outs), (ins DPR:$Dd, addrmode5:$addr),
IIC_fpStore64, "vstr", "\t$Dd, $addr",
[(store (f64 DPR:$Dd), addrmode5:$addr)]>;
[(alignedstore32 (f64 DPR:$Dd), addrmode5:$addr)]>;
def VSTRS : ASI5<0b1101, 0b00, (outs), (ins SPR:$Sd, addrmode5:$addr),
IIC_fpStore32, "vstr", "\t$Sd, $addr",

64
test/CodeGen/ARM/unaligned_load_store.ll
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@ -1,25 +1,25 @@
; RUN: llc < %s -march=arm -pre-RA-sched=source | FileCheck %s -check-prefix=GENERIC
; RUN: llc < %s -mtriple=armv6-apple-darwin | FileCheck %s -check-prefix=DARWIN_V6
; RUN: llc < %s -mtriple=armv6-apple-darwin -arm-strict-align | FileCheck %s -check-prefix=GENERIC
; RUN: llc < %s -mtriple=armv6-linux | FileCheck %s -check-prefix=GENERIC
; RUN: llc < %s -march=arm -pre-RA-sched=source | FileCheck %s -check-prefix=EXPANDED
; RUN: llc < %s -mtriple=armv6-apple-darwin -mcpu=cortex-a8 -arm-strict-align -pre-RA-sched=source | FileCheck %s -check-prefix=EXPANDED
; RUN: llc < %s -mtriple=armv6-apple-darwin -mcpu=cortex-a8 | FileCheck %s -check-prefix=UNALIGNED
; rdar://7113725
; rdar://12091029
define void @t(i8* nocapture %a, i8* nocapture %b) nounwind {
entry:
; GENERIC: t:
; GENERIC: ldrb [[R2:r[0-9]+]]
; GENERIC: ldrb [[R3:r[0-9]+]]
; GENERIC: ldrb [[R12:r[0-9]+]]
; GENERIC: ldrb [[R1:r[0-9]+]]
; GENERIC: strb [[R1]]
; GENERIC: strb [[R12]]
; GENERIC: strb [[R3]]
; GENERIC: strb [[R2]]
; EXPANDED: t:
; EXPANDED: ldrb [[R2:r[0-9]+]]
; EXPANDED: ldrb [[R3:r[0-9]+]]
; EXPANDED: ldrb [[R12:r[0-9]+]]
; EXPANDED: ldrb [[R1:r[0-9]+]]
; EXPANDED: strb [[R1]]
; EXPANDED: strb [[R12]]
; EXPANDED: strb [[R3]]
; EXPANDED: strb [[R2]]
; DARWIN_V6: t:
; DARWIN_V6: ldr r1
; DARWIN_V6: str r1
; UNALIGNED: t:
; UNALIGNED: ldr r1
; UNALIGNED: str r1
%__src1.i = bitcast i8* %b to i32* ; <i32*> [#uses=1]
%__dest2.i = bitcast i8* %a to i32* ; <i32*> [#uses=1]
@ -27,3 +27,35 @@ entry:
store i32 %tmp.i, i32* %__dest2.i, align 1
ret void
}
define void @hword(double* %a, double* %b) nounwind {
entry:
; EXPANDED: hword:
; EXPANDED-NOT: vld1
; EXPANDED: ldrh
; EXPANDED-NOT: str1
; EXPANDED: strh
; UNALIGNED: hword:
; UNALIGNED: vld1.16
; UNALIGNED: vst1.16
%tmp = load double* %a, align 2
store double %tmp, double* %b, align 2
ret void
}
define void @byte(double* %a, double* %b) nounwind {
entry:
; EXPANDED: byte:
; EXPANDED-NOT: vld1
; EXPANDED: ldrb
; EXPANDED-NOT: str1
; EXPANDED: strb
; UNALIGNED: byte:
; UNALIGNED: vld1.8
; UNALIGNED: vst1.8
%tmp = load double* %a, align 1
store double %tmp, double* %b, align 1
ret void
}