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https://github.com/c64scene-ar/llvm-6502.git
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03d3d3b361
cleanup and overdue test cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132038 91177308-0d34-0410-b5e6-96231b3b80d8
94 lines
2.9 KiB
LLVM
94 lines
2.9 KiB
LLVM
; RUN: opt < %s -indvars -disable-iv-rewrite -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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; Tests sign extend elimination in the inner and outer loop.
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; %outercount is straightforward to widen, besides being in an outer loop.
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; %innercount is currently blocked by lcssa, so is not widened.
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; %inneriv can be widened only after proving it has no signed-overflow
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; based on the loop test.
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define void @nestedIV(i8* %address, i32 %limit) nounwind {
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entry:
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%limitdec = add i32 %limit, -1
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br label %outerloop
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; CHECK: outerloop:
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;
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; Eliminate %ofs1 after widening outercount.
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; CHECK-NOT: sext
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; CHECK: getelementptr
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;
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; IV rewriting hoists a gep into this block. We don't like that.
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; CHECK-NOT: getelementptr
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outerloop:
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%outercount = phi i32 [ %outerpostcount, %outermerge ], [ 0, %entry ]
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%innercount = phi i32 [ %innercount.merge, %outermerge ], [ 0, %entry ]
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%outercountdec = add i32 %outercount, -1
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%ofs1 = sext i32 %outercountdec to i64
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%adr1 = getelementptr i8* %address, i64 %ofs1
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store i8 0, i8* %adr1
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br label %innerpreheader
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innerpreheader:
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%innerprecmp = icmp sgt i32 %limitdec, %innercount
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br i1 %innerprecmp, label %innerloop, label %outermerge
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; CHECK: innerloop:
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;
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; Eliminate %ofs2 after widening inneriv.
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; CHECK-NOT: sext
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; CHECK: getelementptr
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;
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; FIXME: We should not increase the number of IVs in this loop.
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; sext elimination plus LFTR results in 3 final IVs.
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;
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; FIXME: eliminate %ofs3 based the loop pre/post conditions
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; even though innerpostiv is not NSW, thus sign extending innerpostiv
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; does not yield the same expression as incrementing the widened inneriv.
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innerloop:
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%inneriv = phi i32 [ %innerpostiv, %innerloop ], [ %innercount, %innerpreheader ]
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%innerpostiv = add i32 %inneriv, 1
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%ofs2 = sext i32 %inneriv to i64
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%adr2 = getelementptr i8* %address, i64 %ofs2
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store i8 0, i8* %adr2
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%ofs3 = sext i32 %innerpostiv to i64
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%adr3 = getelementptr i8* %address, i64 %ofs3
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store i8 0, i8* %adr3
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%innercmp = icmp sgt i32 %limitdec, %innerpostiv
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br i1 %innercmp, label %innerloop, label %innerexit
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innerexit:
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%innercount.lcssa = phi i32 [ %innerpostiv, %innerloop ]
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br label %outermerge
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; CHECK: outermerge:
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;
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; Eliminate %ofs4 after widening outercount
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; CHECK-NOT: sext
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; CHECK: getelementptr
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;
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; TODO: Eliminate %ofs5 after removing lcssa
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outermerge:
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%innercount.merge = phi i32 [ %innercount.lcssa, %innerexit ], [ %innercount, %innerpreheader ]
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%ofs4 = sext i32 %outercount to i64
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%adr4 = getelementptr i8* %address, i64 %ofs4
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store i8 0, i8* %adr3
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%ofs5 = sext i32 %innercount.merge to i64
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%adr5 = getelementptr i8* %address, i64 %ofs5
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store i8 0, i8* %adr4
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%outerpostcount = add i32 %outercount, 1
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%tmp47 = icmp slt i32 %outerpostcount, %limit
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br i1 %tmp47, label %outerloop, label %return
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return:
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ret void
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}
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