efe4e7a026
SCEV currently preserves the nsw flag when performing an nsw multiply of an nsw addrec. While this is legal for nuw, this is not generally the case for nsw. This is because nsw mul does not distribute over nsw add: https://alive2.llvm.org/ce/z/mergCt Instead, we need either both nuw and nsw to be set (https://alive2.llvm.org/ce/z/7wpgGc) or explicitly prove that the distributed multiplications are also nsw (https://alive2.llvm.org/ce/z/wef9su). Fixes https://github.com/llvm/llvm-project/issues/66066.
81 lines
4.1 KiB
LLVM
81 lines
4.1 KiB
LLVM
; RUN: opt -passes='print<delinearization>' -disable-output < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; CHECK: Inst: %tmp = load float, ptr %arrayidx, align 4
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; CHECK-NEXT: In Loop with Header: for.inc
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; CHECK-NEXT: AccessFunction: {(4 * %N * %call),+,4}<%for.inc>
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; CHECK-NEXT: Base offset: %A
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; CHECK-NEXT: ArrayDecl[UnknownSize][%N] with elements of 4 bytes.
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; CHECK-NEXT: ArrayRef[%call][{0,+,1}<nuw><nsw><%for.inc>]
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; CHECK: Inst: %tmp5 = load float, ptr %arrayidx4, align 4
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; CHECK-NEXT: In Loop with Header: for.inc
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; CHECK-NEXT: AccessFunction: {(4 * %call1),+,(4 * %N)}<%for.inc>
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; CHECK-NEXT: Base offset: %B
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; CHECK-NEXT: ArrayDecl[UnknownSize][%N] with elements of 4 bytes.
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; CHECK-NEXT: ArrayRef[{0,+,1}<nuw><nsw><%for.inc>][%call1]
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; Function Attrs: noinline nounwind uwtable
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define void @mat_mul(ptr %C, ptr %A, ptr %B, i64 %N) #0 !kernel_arg_addr_space !2 !kernel_arg_access_qual !3 !kernel_arg_type !4 !kernel_arg_base_type !4 !kernel_arg_type_qual !5 {
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entry:
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br label %entry.split
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entry.split: ; preds = %entry
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%call = tail call i64 @_Z13get_global_idj(i32 0) #3
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%call1 = tail call i64 @_Z13get_global_idj(i32 1) #3
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%cmp1 = icmp sgt i64 %N, 0
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%mul = mul nsw i64 %call, %N
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br i1 %cmp1, label %for.inc.lr.ph, label %for.end
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for.inc.lr.ph: ; preds = %entry.split
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br label %for.inc
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for.inc: ; preds = %for.inc.lr.ph, %for.inc
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%acc.03 = phi float [ 0.000000e+00, %for.inc.lr.ph ], [ %tmp6, %for.inc ]
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%m.02 = phi i64 [ 0, %for.inc.lr.ph ], [ %inc, %for.inc ]
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%add = add nsw i64 %m.02, %mul
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%arrayidx = getelementptr inbounds float, ptr %A, i64 %add
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%tmp = load float, ptr %arrayidx, align 4
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%mul2 = mul nsw i64 %m.02, %N
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%add3 = add nsw i64 %mul2, %call1
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%arrayidx4 = getelementptr inbounds float, ptr %B, i64 %add3
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%tmp5 = load float, ptr %arrayidx4, align 4
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%tmp6 = tail call float @llvm.fmuladd.f32(float %tmp, float %tmp5, float %acc.03)
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%inc = add nuw nsw i64 %m.02, 1
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%exitcond = icmp ne i64 %inc, %N
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br i1 %exitcond, label %for.inc, label %for.cond.for.end_crit_edge
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for.cond.for.end_crit_edge: ; preds = %for.inc
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%.lcssa = phi float [ %tmp6, %for.inc ]
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br label %for.end
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for.end: ; preds = %for.cond.for.end_crit_edge, %entry.split
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%acc.0.lcssa = phi float [ %.lcssa, %for.cond.for.end_crit_edge ], [ 0.000000e+00, %entry.split ]
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%add7 = add nsw i64 %mul, %call1
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%arrayidx8 = getelementptr inbounds float, ptr %C, i64 %add7
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store float %acc.0.lcssa, ptr %arrayidx8, align 4
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ret void
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}
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; Function Attrs: nounwind readnone
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declare i64 @_Z13get_global_idj(i32) #1
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; Function Attrs: nounwind readnone speculatable
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declare float @llvm.fmuladd.f32(float, float, float) #2
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attributes #0 = { noinline nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { nounwind readnone }
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!llvm.module.flags = !{!0}
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!llvm.ident = !{!1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{!"clang version 5.0.0 (trunk 303846) (llvm/trunk 303834)"}
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!2 = !{i32 1, i32 1, i32 1, i32 0}
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!3 = !{!"none", !"none", !"none", !"none"}
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!4 = !{!"float*", !"float*", !"float*", !"long"}
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!5 = !{!"", !"", !"", !""}
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