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c3a4f33cc1
Namely, check if the target allows to fold more that one register in the addressing mode and if yes, adjust the cost accordingly. Prior to this commit, reg1 + scale * reg2 accesses were artificially preferred to reg1 + reg2 accesses. Indeed, the cost model wrongly assumed that reg1 + reg2 needs a temporary register for the computation, whereas it was correctly estimated for reg1 + scale * reg2. <rdar://problem/13973908> llvm-svn: 183021
85 lines
3.3 KiB
LLVM
85 lines
3.3 KiB
LLVM
; RUN: opt -loop-reduce -S < %s | FileCheck %s
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;
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; LTO of clang, which mistakenly uses no TargetLoweringInfo, causes a
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; miscompile. ReuseOrCreateCast replace ptrtoint operand with undef.
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; Reproducing the miscompile requires no triple, hence no "TTI".
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; rdar://13007381
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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-S128"
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; Verify that nothing uses the "dead" ptrtoint from "undef".
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; CHECK: @VerifyDiagnosticConsumerTest
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; CHECK: bb:
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; "dead" ptrpoint not emitted (or dead code eliminated) with
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; current LSR cost model.
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; CHECK-NOT: = ptrtoint i8* undef to i64
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; CHECK: .lr.ph
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; CHECK: [[TMP:%[^ ]+]] = add i64 %tmp5, 1
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; CHECK: sub i64 [[TMP]], %tmp6
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; CHECK: ret void
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define void @VerifyDiagnosticConsumerTest() unnamed_addr nounwind uwtable align 2 {
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bb:
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%tmp3 = call i8* @getCharData() nounwind
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%tmp4 = call i8* @getCharData() nounwind
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%tmp5 = ptrtoint i8* %tmp4 to i64
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%tmp6 = ptrtoint i8* %tmp3 to i64
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%tmp7 = sub i64 %tmp5, %tmp6
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br i1 undef, label %bb87, label %.preheader
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.preheader: ; preds = %bb10, %bb
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br i1 undef, label %_ZNK4llvm9StringRef4findEcm.exit42.thread, label %bb10
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bb10: ; preds = %.preheader
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br i1 undef, label %_ZNK4llvm9StringRef4findEcm.exit42, label %.preheader
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_ZNK4llvm9StringRef4findEcm.exit42: ; preds = %bb10
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br i1 undef, label %_ZNK4llvm9StringRef4findEcm.exit42.thread, label %.lr.ph
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_ZNK4llvm9StringRef4findEcm.exit42.thread: ; preds = %_ZNK4llvm9StringRef4findEcm.exit42, %.preheader
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unreachable
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.lr.ph: ; preds = %_ZNK4llvm9StringRef4findEcm.exit42
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br label %bb36
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_ZNK4llvm9StringRef4findEcm.exit.loopexit: ; preds = %bb63
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%tmp21 = icmp eq i64 %i.0.i, -1
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br i1 %tmp21, label %_ZNK4llvm9StringRef4findEcm.exit._crit_edge, label %bb36
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_ZNK4llvm9StringRef4findEcm.exit._crit_edge: ; preds = %bb61, %_ZNK4llvm9StringRef4findEcm.exit.loopexit
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unreachable
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bb36: ; preds = %_ZNK4llvm9StringRef4findEcm.exit.loopexit, %.lr.ph
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%loc.063 = phi i64 [ undef, %.lr.ph ], [ %i.0.i, %_ZNK4llvm9StringRef4findEcm.exit.loopexit ]
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switch i8 undef, label %bb57 [
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i8 10, label %bb48
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i8 13, label %bb48
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]
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bb48: ; preds = %bb36, %bb36
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br label %bb58
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bb57: ; preds = %bb36
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br label %bb58
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bb58: ; preds = %bb57, %bb48
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%tmp59 = icmp ugt i64 %tmp7, undef
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%tmp60 = select i1 %tmp59, i64 undef, i64 %tmp7
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br label %bb61
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bb61: ; preds = %bb63, %bb58
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%i.0.i = phi i64 [ %tmp60, %bb58 ], [ %tmp67, %bb63 ]
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%tmp62 = icmp eq i64 %i.0.i, %tmp7
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br i1 %tmp62, label %_ZNK4llvm9StringRef4findEcm.exit._crit_edge, label %bb63
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bb63: ; preds = %bb61
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%tmp64 = getelementptr inbounds i8* %tmp3, i64 %i.0.i
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%tmp65 = load i8* %tmp64, align 1
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%tmp67 = add i64 %i.0.i, 1
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br i1 undef, label %_ZNK4llvm9StringRef4findEcm.exit.loopexit, label %bb61
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bb87: ; preds = %bb
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ret void
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}
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declare i8* @getCharData()
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