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7e22e3a1ea
When expanding neon pseudo stores, it may miss the implicit uses of sub
regs, which may cause post RA scheduler reorder instructions that
breakes anti dependency.
For example:
VST1d64QPseudo %R0<kill>, 16, %Q9_Q10, pred:14, pred:%noreg
will be expanded to
VST1d64Q %R0<kill>, 16, %D18, pred:14, pred:%noreg;
An instruction that defines %D20 may be scheduled before the store by
mistake.
This patches adds implicit uses for such case. For the example above, it
emits:
VST1d64Q %R0<kill>, 8, %D18, pred:14, pred:%noreg, %Q9_Q10<imp-use>
llvm-svn: 199282
56 lines
2.2 KiB
LLVM
56 lines
2.2 KiB
LLVM
; RUN: llc < %s -march=arm -mattr=+neon -print-before=post-RA-sched > %t 2>&1 && FileCheck < %t %s
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define void @vst(i8* %m, [4 x i64] %v) {
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entry:
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; CHECK: vst:
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; CHECK: VST1d64Q %R{{[0-9]+}}<kill>, 8, %D{{[0-9]+}}, pred:14, pred:%noreg, %Q{{[0-9]+}}_Q{{[0-9]+}}<imp-use>
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%v0 = extractvalue [4 x i64] %v, 0
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%v1 = extractvalue [4 x i64] %v, 1
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%v2 = extractvalue [4 x i64] %v, 2
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%v3 = extractvalue [4 x i64] %v, 3
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%t0 = bitcast i64 %v0 to <8 x i8>
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%t1 = bitcast i64 %v1 to <8 x i8>
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%t2 = bitcast i64 %v2 to <8 x i8>
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%t3 = bitcast i64 %v3 to <8 x i8>
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%s0 = bitcast <8 x i8> %t0 to <1 x i64>
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%s1 = bitcast <8 x i8> %t1 to <1 x i64>
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%s2 = bitcast <8 x i8> %t2 to <1 x i64>
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%s3 = bitcast <8 x i8> %t3 to <1 x i64>
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%tmp0 = bitcast <1 x i64> %s2 to i64
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%tmp1 = bitcast <1 x i64> %s3 to i64
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%n0 = insertelement <2 x i64> undef, i64 %tmp0, i32 0
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%n1 = insertelement <2 x i64> %n0, i64 %tmp1, i32 1
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call void @llvm.arm.neon.vst4.v1i64(i8* %m, <1 x i64> %s0, <1 x i64> %s1, <1 x i64> %s2, <1 x i64> %s3, i32 8)
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call void @bar(<2 x i64> %n1)
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ret void
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}
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%struct.__neon_int8x8x4_t = type { <8 x i8>, <8 x i8>, <8 x i8>, <8 x i8> }
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define <8 x i8> @vtbx4(<8 x i8>* %A, %struct.__neon_int8x8x4_t* %B, <8 x i8>* %C) nounwind {
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; CHECK: vtbx4:
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; CHECK: VTBX4 {{.*}}, pred:14, pred:%noreg, %Q{{[0-9]+}}_Q{{[0-9]+}}<imp-use>
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%tmp1 = load <8 x i8>* %A
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%tmp2 = load %struct.__neon_int8x8x4_t* %B
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%tmp3 = extractvalue %struct.__neon_int8x8x4_t %tmp2, 0
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%tmp4 = extractvalue %struct.__neon_int8x8x4_t %tmp2, 1
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%tmp5 = extractvalue %struct.__neon_int8x8x4_t %tmp2, 2
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%tmp6 = extractvalue %struct.__neon_int8x8x4_t %tmp2, 3
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%tmp7 = load <8 x i8>* %C
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%tmp8 = call <8 x i8> @llvm.arm.neon.vtbx4(<8 x i8> %tmp1, <8 x i8> %tmp3, <8 x i8> %tmp4, <8 x i8> %tmp5, <8 x i8> %tmp6, <8 x i8> %tmp7)
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call void @bar2(%struct.__neon_int8x8x4_t %tmp2, <8 x i8> %tmp8)
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ret <8 x i8> %tmp8
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}
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declare void @llvm.arm.neon.vst4.v1i64(i8*, <1 x i64>, <1 x i64>, <1 x i64>, <1 x i64>, i32)
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declare <8 x i8> @llvm.arm.neon.vtbx4(<8 x i8>, <8 x i8>, <8 x i8>, <8 x i8>, <8 x i8>, <8 x i8>) nounwind readnone
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declare void @bar2(%struct.__neon_int8x8x4_t, <8 x i8>)
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declare void @bar(<2 x i64> %arg)
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