92 lines
4.9 KiB
LLVM
92 lines
4.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -unroll-runtime -unroll-count=2 -loop-unroll -unroll-runtime-epilog=true | FileCheck %s -check-prefix=EPILOG
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; RUN: opt < %s -S -unroll-runtime -unroll-count=2 -loop-unroll -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; This test case documents how runtime loop unrolling handles the case
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; when the backedge-count is -1.
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; If %N, the backedge-taken count, is -1 then %0 unsigned-overflows
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; and is 0. %xtraiter too is 0, signifying that the total trip-count
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; is divisible by 2. The prologue then branches to the unrolled loop
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; and executes the 2^32 iterations there, in groups of 2.
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define i32 @foo(i32 %N) {
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; EPILOG-LABEL: @foo(
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; EPILOG-NEXT: entry:
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; EPILOG-NEXT: [[TMP0:%.*]] = add i32 [[N:%.*]], 1
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; EPILOG-NEXT: [[XTRAITER:%.*]] = and i32 [[TMP0]], 1
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; EPILOG-NEXT: [[TMP1:%.*]] = icmp ult i32 [[N]], 1
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; EPILOG-NEXT: br i1 [[TMP1]], label [[WHILE_END_UNR_LCSSA:%.*]], label [[ENTRY_NEW:%.*]]
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; EPILOG: entry.new:
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; EPILOG-NEXT: [[UNROLL_ITER:%.*]] = sub i32 [[TMP0]], [[XTRAITER]]
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; EPILOG-NEXT: br label [[WHILE_BODY:%.*]]
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; EPILOG: while.body:
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; EPILOG-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY_NEW]] ], [ [[INC_1:%.*]], [[WHILE_BODY]] ]
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; EPILOG-NEXT: [[NITER:%.*]] = phi i32 [ 0, [[ENTRY_NEW]] ], [ [[NITER_NEXT_1:%.*]], [[WHILE_BODY]] ]
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; EPILOG-NEXT: [[INC:%.*]] = add nuw nsw i32 [[I]], 1
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; EPILOG-NEXT: [[NITER_NEXT:%.*]] = add nuw nsw i32 [[NITER]], 1
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; EPILOG-NEXT: [[INC_1]] = add i32 [[INC]], 1
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; EPILOG-NEXT: [[NITER_NEXT_1]] = add i32 [[NITER_NEXT]], 1
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; EPILOG-NEXT: [[NITER_NCMP_1:%.*]] = icmp eq i32 [[NITER_NEXT_1]], [[UNROLL_ITER]]
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; EPILOG-NEXT: br i1 [[NITER_NCMP_1]], label [[WHILE_END_UNR_LCSSA_LOOPEXIT:%.*]], label [[WHILE_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; EPILOG: while.end.unr-lcssa.loopexit:
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; EPILOG-NEXT: [[I_LCSSA_PH_PH:%.*]] = phi i32 [ [[INC]], [[WHILE_BODY]] ]
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; EPILOG-NEXT: [[I_UNR_PH:%.*]] = phi i32 [ [[INC_1]], [[WHILE_BODY]] ]
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; EPILOG-NEXT: br label [[WHILE_END_UNR_LCSSA]]
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; EPILOG: while.end.unr-lcssa:
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; EPILOG-NEXT: [[I_LCSSA_PH:%.*]] = phi i32 [ undef, [[ENTRY:%.*]] ], [ [[I_LCSSA_PH_PH]], [[WHILE_END_UNR_LCSSA_LOOPEXIT]] ]
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; EPILOG-NEXT: [[I_UNR:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[I_UNR_PH]], [[WHILE_END_UNR_LCSSA_LOOPEXIT]] ]
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; EPILOG-NEXT: [[LCMP_MOD:%.*]] = icmp ne i32 [[XTRAITER]], 0
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; EPILOG-NEXT: br i1 [[LCMP_MOD]], label [[WHILE_BODY_EPIL_PREHEADER:%.*]], label [[WHILE_END:%.*]]
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; EPILOG: while.body.epil.preheader:
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; EPILOG-NEXT: br label [[WHILE_BODY_EPIL:%.*]]
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; EPILOG: while.body.epil:
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; EPILOG-NEXT: br label [[WHILE_END]]
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; EPILOG: while.end:
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; EPILOG-NEXT: [[I_LCSSA:%.*]] = phi i32 [ [[I_LCSSA_PH]], [[WHILE_END_UNR_LCSSA]] ], [ [[I_UNR]], [[WHILE_BODY_EPIL]] ]
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; EPILOG-NEXT: ret i32 [[I_LCSSA]]
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;
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; PROLOG-LABEL: @foo(
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; PROLOG-NEXT: entry:
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; PROLOG-NEXT: [[TMP0:%.*]] = add i32 [[N:%.*]], 1
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; PROLOG-NEXT: [[XTRAITER:%.*]] = and i32 [[TMP0]], 1
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; PROLOG-NEXT: [[LCMP_MOD:%.*]] = icmp ne i32 [[XTRAITER]], 0
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; PROLOG-NEXT: br i1 [[LCMP_MOD]], label [[WHILE_BODY_PROL_PREHEADER:%.*]], label [[WHILE_BODY_PROL_LOOPEXIT:%.*]]
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; PROLOG: while.body.prol.preheader:
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; PROLOG-NEXT: br label [[WHILE_BODY_PROL:%.*]]
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; PROLOG: while.body.prol:
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; PROLOG-NEXT: br label [[WHILE_BODY_PROL_LOOPEXIT]]
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; PROLOG: while.body.prol.loopexit:
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; PROLOG-NEXT: [[I_LCSSA_UNR:%.*]] = phi i32 [ undef, [[ENTRY:%.*]] ], [ 0, [[WHILE_BODY_PROL]] ]
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; PROLOG-NEXT: [[I_UNR:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ 1, [[WHILE_BODY_PROL]] ]
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; PROLOG-NEXT: [[TMP1:%.*]] = icmp ult i32 [[N]], 1
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; PROLOG-NEXT: br i1 [[TMP1]], label [[WHILE_END:%.*]], label [[ENTRY_NEW:%.*]]
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; PROLOG: entry.new:
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; PROLOG-NEXT: br label [[WHILE_BODY:%.*]]
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; PROLOG: while.body:
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; PROLOG-NEXT: [[I:%.*]] = phi i32 [ [[I_UNR]], [[ENTRY_NEW]] ], [ [[INC_1:%.*]], [[WHILE_BODY]] ]
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; PROLOG-NEXT: [[INC:%.*]] = add i32 [[I]], 1
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; PROLOG-NEXT: [[CMP_1:%.*]] = icmp eq i32 [[INC]], [[N]]
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; PROLOG-NEXT: [[INC_1]] = add i32 [[INC]], 1
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; PROLOG-NEXT: br i1 [[CMP_1]], label [[WHILE_END_UNR_LCSSA:%.*]], label [[WHILE_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; PROLOG: while.end.unr-lcssa:
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; PROLOG-NEXT: [[I_LCSSA_PH:%.*]] = phi i32 [ [[INC]], [[WHILE_BODY]] ]
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; PROLOG-NEXT: br label [[WHILE_END]]
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; PROLOG: while.end:
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; PROLOG-NEXT: [[I_LCSSA:%.*]] = phi i32 [ [[I_LCSSA_UNR]], [[WHILE_BODY_PROL_LOOPEXIT]] ], [ [[I_LCSSA_PH]], [[WHILE_END_UNR_LCSSA]] ]
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; PROLOG-NEXT: ret i32 [[I_LCSSA]]
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;
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entry:
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br label %while.body
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while.body: ; preds = %while.body, %entry
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%i = phi i32 [ 0, %entry ], [ %inc, %while.body ]
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%cmp = icmp eq i32 %i, %N
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%inc = add i32 %i, 1
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br i1 %cmp, label %while.end, label %while.body
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while.end: ; preds = %while.body
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ret i32 %i
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}
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