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Add minnum / maxnum intrinsics

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These are named following the IEEE-754 names for these
functions, rather than the libm fmin / fmax to avoid
possible ambiguities. Some languages may implement something
resembling fmin / fmax which return NaN if either operand is
to propagate errors. These implement the IEEE-754 semantics
of returning the other operand if either is a NaN representing
missing data.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-10-21 23:00:20 +00:00
parent cb3866e72e
commit 252134602f
14 changed files with 773 additions and 2 deletions
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56
test/Transforms/LoopVectorize/intrinsic.ll
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@@ -1192,3 +1192,59 @@ for.body: ; preds = %entry, %for.body
for.end: ; preds = %for.body, %entry
ret void
}
declare float @llvm.minnum.f32(float, float) nounwind readnone
;CHECK-LABEL: @minnum_f32(
;CHECK: llvm.minnum.v4f32
;CHECK: ret void
define void @minnum_f32(i32 %n, float* noalias %y, float* noalias %x, float* noalias %z) nounwind uwtable {
entry:
%cmp9 = icmp sgt i32 %n, 0
br i1 %cmp9, label %for.body, label %for.end
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds float* %y, i64 %indvars.iv
%0 = load float* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds float* %z, i64 %indvars.iv
%1 = load float* %arrayidx2, align 4
%call = tail call float @llvm.minnum.f32(float %0, float %1) nounwind readnone
%arrayidx4 = getelementptr inbounds float* %x, i64 %indvars.iv
store float %call, float* %arrayidx4, align 4
%indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}
declare float @llvm.maxnum.f32(float, float) nounwind readnone
;CHECK-LABEL: @maxnum_f32(
;CHECK: llvm.maxnum.v4f32
;CHECK: ret void
define void @maxnum_f32(i32 %n, float* noalias %y, float* noalias %x, float* noalias %z) nounwind uwtable {
entry:
%cmp9 = icmp sgt i32 %n, 0
br i1 %cmp9, label %for.body, label %for.end
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds float* %y, i64 %indvars.iv
%0 = load float* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds float* %z, i64 %indvars.iv
%1 = load float* %arrayidx2, align 4
%call = tail call float @llvm.maxnum.f32(float %0, float %1) nounwind readnone
%arrayidx4 = getelementptr inbounds float* %x, i64 %indvars.iv
store float %call, float* %arrayidx4, align 4
%indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}