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43 lines
1.4 KiB
LLVM
43 lines
1.4 KiB
LLVM
; RUN: opt -verify-loop-info -irce -S < %s | FileCheck %s
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define void @decrementing_loop(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
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entry:
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%len = load i32, i32* %a_len_ptr, !range !0
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%first.itr.check = icmp sgt i32 %n, 0
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%start = sub i32 %n, 1
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br i1 %first.itr.check, label %loop, label %exit
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loop:
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%idx = phi i32 [ %start, %entry ] , [ %idx.dec, %in.bounds ]
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%idx.dec = sub i32 %idx, 1
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%abc.high = icmp slt i32 %idx, %len
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%abc.low = icmp sge i32 %idx, 0
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%abc = and i1 %abc.low, %abc.high
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br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
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in.bounds:
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%addr = getelementptr i32, i32* %arr, i32 %idx
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store i32 0, i32* %addr
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%next = icmp sgt i32 %idx.dec, -1
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br i1 %next, label %loop, label %exit
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out.of.bounds:
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ret void
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exit:
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ret void
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; CHECK: loop.preheader:
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; CHECK: [[not_len:[^ ]+]] = sub i32 -1, %len
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; CHECK: [[not_n:[^ ]+]] = sub i32 -1, %n
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; CHECK: [[not_len_hiclamp_cmp:[^ ]+]] = icmp sgt i32 [[not_len]], [[not_n]]
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; CHECK: [[not_len_hiclamp:[^ ]+]] = select i1 [[not_len_hiclamp_cmp]], i32 [[not_len]], i32 [[not_n]]
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; CHECK: [[len_hiclamp:[^ ]+]] = sub i32 -1, [[not_len_hiclamp]]
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; CHECK: [[not_exit_preloop_at_cmp:[^ ]+]] = icmp sgt i32 [[len_hiclamp]], 0
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; CHECK: [[not_exit_preloop_at:[^ ]+]] = select i1 [[not_exit_preloop_at_cmp]], i32 [[len_hiclamp]], i32 0
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; CHECK: %exit.preloop.at = add i32 [[not_exit_preloop_at]], -1
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}
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!0 = !{i32 0, i32 2147483647}
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!1 = !{!"branch_weights", i32 64, i32 4}
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