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This patch lets the llvm tools handle the new HVX target features that
are added by frontend (clang). The target-features are of the form
"hvx-length64b" for 64 Byte HVX mode, "hvx-length128b" for 128 Byte mode HVX.
"hvx-double" is an alias to "hvx-length128b" and is soon will be deprecated.
The hvx version target feature is upgated form "+hvx" to "+hvxv{version_number}.
Eg: "+hvxv62"
For the correct HVX code generation, the user must use the following
target features.
For 64B mode: "+hvxv62" "+hvx-length64b"
For 128B mode: "+hvxv62" "+hvx-length128b"
Clang picks a default length if none is specified. If for some reason,
no hvx-length is specified to llvm, the compilation will bail out.
There is a corresponding clang patch.
Differential Revision: https://reviews.llvm.org/D38851
llvm-svn: 316101
38 lines
1.2 KiB
LLVM
38 lines
1.2 KiB
LLVM
; RUN: llc -march=hexagon < %s | FileCheck %s
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; REQUIRES: asserts
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; Hexagon early if-conversion used to crash on this testcase due to not
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; recognizing vector predicate registers.
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target triple = "hexagon"
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; Check that the early if-conversion has not happened.
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; CHECK-LABEL: fred
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; CHECK: q{{[0-3]}} = not
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; CHECK: LBB
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; CHECK: if (q{{[0-3]}}) vmem
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define void @fred(i32 %a0) #0 {
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b1:
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%v2 = tail call <1024 x i1> @llvm.hexagon.V6.pred.scalar2.128B(i32 %a0) #2
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br i1 undef, label %b3, label %b5
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b3: ; preds = %b1
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%v4 = tail call <1024 x i1> @llvm.hexagon.V6.pred.not.128B(<1024 x i1> %v2) #2
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br label %b5
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b5: ; preds = %b3, %b1
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%v6 = phi <1024 x i1> [ %v4, %b3 ], [ %v2, %b1 ]
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%v7 = bitcast <1024 x i1> %v6 to <32 x i32>
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tail call void asm sideeffect "if ($0) vmem($1) = $2;", "q,r,v,~{memory}"(<32 x i32> %v7, <32 x i32>* undef, <32 x i32> undef) #2
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ret void
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}
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declare <1024 x i1> @llvm.hexagon.V6.pred.scalar2.128B(i32) #1
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declare <1024 x i1> @llvm.hexagon.V6.pred.not.128B(<1024 x i1>) #1
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attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+hvx,+hvx-length128b" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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