c70f0b9d4a
Currently the SCEVExpander tries to re-use existing casts, even if they are not exactly at the insertion point it was asked to create the cast. To do so in some case, it creates a new cast at the insertion point and updates all users to use the new cast. This behavior is problematic, because it changes the IR outside of the instructions created during the expansion. Therefore we cannot completely undo all changes made during expansion. This re-use should be only an extra optimization, so only using the new cast in the expanded instructions should not be a correctness issue. There are many cases equivalent instructions are created during expansion. This patch also adjusts findInsertPointAfter to skip instructions inserted during expansion. This enables re-using existing casts without the renaming any uses, by picking a better insertion point. Reviewed By: efriedma, lebedev.ri Differential Revision: https://reviews.llvm.org/D84399
82 lines
3.5 KiB
LLVM
82 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -loop-reduce -S | FileCheck %s
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc18.0.0"
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%struct.L = type { i8, i8* }
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declare i32 @__CxxFrameHandler3(...)
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@GV1 = external global %struct.L*
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@GV2 = external global %struct.L
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define void @b_copy_ctor() personality i32 (...)* @__CxxFrameHandler3 {
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; CHECK-LABEL: @b_copy_ctor(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = load %struct.L*, %struct.L** @GV1, align 8
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; CHECK-NEXT: [[TMP1:%.*]] = ptrtoint %struct.L* [[TMP0]] to i64
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; CHECK-NEXT: br label [[FOR_COND:%.*]]
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; CHECK: for.cond:
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; CHECK-NEXT: [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[CALL_I_NOEXC:%.*]] ], [ 0, [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[TMP:%.*]] = inttoptr i64 [[LSR_IV]] to %struct.L*
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; CHECK-NEXT: invoke void @a_copy_ctor()
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; CHECK-NEXT: to label [[CALL_I_NOEXC]] unwind label [[CATCH_DISPATCH:%.*]]
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; CHECK: call.i.noexc:
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; CHECK-NEXT: [[LSR_IV_NEXT]] = add i64 [[LSR_IV]], 16
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; CHECK-NEXT: br label [[FOR_COND]]
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; CHECK: catch.dispatch:
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; CHECK-NEXT: [[TMP2:%.*]] = catchswitch within none [label %catch] unwind to caller
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; CHECK: catch:
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; CHECK-NEXT: [[TMP3:%.*]] = catchpad within [[TMP2]] [i8* null, i32 64, i8* null]
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; CHECK-NEXT: [[CMP16:%.*]] = icmp eq %struct.L* [[TMP]], null
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; CHECK-NEXT: [[TMP4:%.*]] = sub i64 0, [[TMP1]]
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; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, i8* getelementptr inbounds (%struct.L, %struct.L* @GV2, i32 0, i32 0), i64 [[TMP4]]
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; CHECK-NEXT: [[UGLYGEP1:%.*]] = bitcast i8* [[UGLYGEP]] to %struct.L*
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; CHECK-NEXT: br i1 [[CMP16]], label [[FOR_END:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
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; CHECK: for.body.preheader:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[TMP5:%.*]] = inttoptr i64 [[LSR_IV]] to %struct.L*
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq %struct.L* [[UGLYGEP1]], [[TMP5]]
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; CHECK-NEXT: br i1 [[CMP]], label [[FOR_END_LOOPEXIT:%.*]], label [[FOR_BODY]]
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; CHECK: for.end.loopexit:
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; CHECK-NEXT: br label [[FOR_END]]
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; CHECK: for.end:
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; CHECK-NEXT: catchret from [[TMP3]] to label [[TRY_CONT:%.*]]
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; CHECK: try.cont:
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; CHECK-NEXT: ret void
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;
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entry:
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%0 = load %struct.L*, %struct.L** @GV1, align 8
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br label %for.cond
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for.cond: ; preds = %call.i.noexc, %entry
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%d.0 = phi %struct.L* [ %0, %entry ], [ %incdec.ptr, %call.i.noexc ]
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invoke void @a_copy_ctor()
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to label %call.i.noexc unwind label %catch.dispatch
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call.i.noexc: ; preds = %for.cond
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%incdec.ptr = getelementptr inbounds %struct.L, %struct.L* %d.0, i64 1
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br label %for.cond
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catch.dispatch: ; preds = %for.cond
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%1 = catchswitch within none [label %catch] unwind to caller
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catch: ; preds = %catch.dispatch
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%2 = catchpad within %1 [i8* null, i32 64, i8* null]
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%cmp16 = icmp eq %struct.L* %0, %d.0
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br i1 %cmp16, label %for.end, label %for.body
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for.body: ; preds = %for.body, %catch
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%cmp = icmp eq %struct.L* @GV2, %d.0
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br i1 %cmp, label %for.end, label %for.body
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for.end: ; preds = %for.body, %catch
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catchret from %2 to label %try.cont
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try.cont: ; preds = %for.end
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ret void
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}
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declare void @a_copy_ctor()
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