c4a60c9d34
This is an attempt to reland D42600 and enabling this optimisation by default. This also resolves the issue pointed out in the context of PGO build. Differential Revision: https://reviews.llvm.org/D42600
95 lines
3.8 KiB
LLVM
95 lines
3.8 KiB
LLVM
; REQUIRES: asserts
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; RUN: llc -mtriple=arm64-unknown-linux-gnu -debug-only=tailduplication %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=LINUX
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; RUN: llc -mtriple=arm64-apple-darwin -debug-only=tailduplication %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=DARWIN
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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@g = common local_unnamed_addr global i32 0, align 4
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@f = common local_unnamed_addr global i32 0, align 4
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@a = common local_unnamed_addr global i32 0, align 4
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@m = common local_unnamed_addr global i32 0, align 4
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@l = common local_unnamed_addr global i32 0, align 4
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@j = common local_unnamed_addr global i32 0, align 4
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@k = common local_unnamed_addr global i32 0, align 4
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@i = common local_unnamed_addr global i32 0, align 4
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@d = common local_unnamed_addr global i32 0, align 4
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@c = common local_unnamed_addr global i32 0, align 4
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@e = common local_unnamed_addr global i32 0, align 4
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@h = common local_unnamed_addr global i32 0, align 4
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; Function Attrs: norecurse nounwind uwtable
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define void @n(i32 %o, ptr nocapture readonly %b) local_unnamed_addr #0 {
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entry:
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%0 = load i32, ptr @g, align 4, !tbaa !2
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %entry.if.end_crit_edge, label %if.then
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entry.if.end_crit_edge: ; preds = %entry
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%.pre = load i32, ptr @f, align 4, !tbaa !2
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br label %if.end
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if.then: ; preds = %entry
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store i32 0, ptr @f, align 4, !tbaa !2
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br label %if.end
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; DARWIN: Merging into block
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; LINUX: Merging into block
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if.end: ; preds = %entry.if.end_crit_edge, %if.then
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%1 = phi i32 [ %.pre, %entry.if.end_crit_edge ], [ 0, %if.then ]
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%cmp6 = icmp slt i32 %1, %o
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br i1 %cmp6, label %for.body.lr.ph, label %for.end
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for.body.lr.ph: ; preds = %if.end
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%.pre7 = load i32, ptr @a, align 4, !tbaa !2
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%.pre8 = load i32, ptr @l, align 4, !tbaa !2
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%.pre9 = load i32, ptr @j, align 4, !tbaa !2
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%.pre10 = load i32, ptr @k, align 4, !tbaa !2
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%.pre11 = load i32, ptr @i, align 4, !tbaa !2
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br label %for.body
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for.body: ; preds = %if.end5, %for.body.lr.ph
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%2 = phi i32 [ %.pre11, %for.body.lr.ph ], [ %7, %if.end5 ]
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%3 = phi i32 [ %.pre10, %for.body.lr.ph ], [ %8, %if.end5 ]
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%4 = phi i32 [ %.pre9, %for.body.lr.ph ], [ %9, %if.end5 ]
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%5 = phi i32 [ %1, %for.body.lr.ph ], [ %inc, %if.end5 ]
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store i32 %.pre7, ptr @m, align 4, !tbaa !2
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%mul = mul nsw i32 %3, %4
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%cmp1 = icmp sgt i32 %.pre8, %mul
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%conv = zext i1 %cmp1 to i32
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%cmp2 = icmp slt i32 %2, %conv
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br i1 %cmp2, label %if.then4, label %if.end5
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if.then4: ; preds = %for.body
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%6 = load i32, ptr @d, align 4, !tbaa !2
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store i32 %6, ptr @k, align 4, !tbaa !2
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store i32 %6, ptr @i, align 4, !tbaa !2
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store i32 %6, ptr @j, align 4, !tbaa !2
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br label %if.end5
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if.end5: ; preds = %if.then4, %for.body
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%7 = phi i32 [ %6, %if.then4 ], [ %2, %for.body ]
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%8 = phi i32 [ %6, %if.then4 ], [ %3, %for.body ]
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%9 = phi i32 [ %6, %if.then4 ], [ %4, %for.body ]
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%10 = load i32, ptr @c, align 4, !tbaa !2
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%idxprom = sext i32 %10 to i64
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%arrayidx = getelementptr inbounds i32, ptr %b, i64 %idxprom
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%11 = load i32, ptr %arrayidx, align 4, !tbaa !2
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%12 = load i32, ptr @e, align 4, !tbaa !2
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%sub = sub nsw i32 %11, %12
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store i32 %sub, ptr @h, align 4, !tbaa !2
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%inc = add nsw i32 %5, 1
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store i32 %inc, ptr @f, align 4, !tbaa !2
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%exitcond = icmp eq i32 %inc, %o
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %if.end5, %if.end
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ret void
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}
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attributes #0 = { norecurse nounwind uwtable }
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!2 = !{!3, !3, i64 0}
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!3 = !{!"int", !4, i64 0}
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!4 = !{}
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