db45746821
Loop peeling is currently performed as part of UnrollLoop(). Outside test scenarios, it is always performed with an unroll count of 1. This means that unrolling doesn't actually do anything apart from performing post-unroll simplification. When testing, it's currently possible to specify both an explicit peel count and an explicit unroll count. This doesn't perform any sensible operation and may result in miscompiles, see https://bugs.llvm.org/show_bug.cgi?id=45939. This patch moves peeling from UnrollLoop() into tryToUnrollLoop(), so that peeling does not also perform a susequent unroll. We only run the post-unroll simplifications. Specifying both an explicit peel count and unroll count is forbidden. In the future, we may want to support both (non-PGO) peeling a loop and unrolling it, but this needs to be done by first performing the peel and then recalculating unrolling heuristics on a now possibly analyzable loop. Differential Revision: https://reviews.llvm.org/D103362
111 lines
4.4 KiB
LLVM
111 lines
4.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S < %s -loop-unroll | FileCheck %s
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; RUN: opt -S < %s -passes=loop-unroll | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128-ni:1-p2:32:8:8:32-ni:2"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: br label [[BB1:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: [[TMP:%.*]] = phi i32 [ -147, [[BB:%.*]] ], [ [[TMP14:%.*]], [[BB13:%.*]] ]
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; CHECK-NEXT: br label [[BB2_PEEL_BEGIN:%.*]]
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; CHECK: bb2.peel.begin:
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; CHECK-NEXT: br label [[BB2_PEEL:%.*]]
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; CHECK: bb2.peel:
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; CHECK-NEXT: [[TMP4_PEEL:%.*]] = add nsw i32 undef, [[TMP]]
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; CHECK-NEXT: br label [[BB5_PEEL:%.*]]
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; CHECK: bb5.peel:
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; CHECK-NEXT: [[TMP6_PEEL:%.*]] = icmp eq i32 undef, 33
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; CHECK-NEXT: br i1 [[TMP6_PEEL]], label [[BB7_PEEL:%.*]], label [[BB15_LOOPEXIT2:%.*]]
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; CHECK: bb7.peel:
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; CHECK-NEXT: [[TMP8_PEEL:%.*]] = sub nsw i32 undef, undef
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; CHECK-NEXT: [[TMP9_PEEL:%.*]] = icmp eq i32 [[TMP8_PEEL]], 0
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; CHECK-NEXT: br i1 [[TMP9_PEEL]], label [[BB10_PEEL:%.*]], label [[BB10_PEEL]]
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; CHECK: bb10.peel:
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; CHECK-NEXT: [[TMP11_PEEL:%.*]] = icmp eq i8 undef, 0
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; CHECK-NEXT: br i1 [[TMP11_PEEL]], label [[BB12_PEEL:%.*]], label [[BB17_LOOPEXIT3:%.*]]
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; CHECK: bb12.peel:
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; CHECK-NEXT: br i1 false, label [[BB13]], label [[BB2_PEEL_NEXT:%.*]]
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; CHECK: bb2.peel.next:
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; CHECK-NEXT: br label [[BB2_PEEL_NEXT1:%.*]]
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; CHECK: bb2.peel.next1:
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; CHECK-NEXT: br label [[BB1_PEEL_NEWPH:%.*]]
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; CHECK: bb1.peel.newph:
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; CHECK-NEXT: br label [[BB2:%.*]]
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; CHECK: bb2:
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; CHECK-NEXT: [[TMP3:%.*]] = phi i32 [ [[TMP4_PEEL]], [[BB1_PEEL_NEWPH]] ], [ [[TMP4:%.*]], [[BB12:%.*]] ]
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; CHECK-NEXT: [[TMP4]] = add nsw i32 [[TMP3]], [[TMP]]
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; CHECK-NEXT: br label [[BB5:%.*]]
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; CHECK: bb5:
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; CHECK-NEXT: br i1 undef, label [[BB7:%.*]], label [[BB15_LOOPEXIT:%.*]]
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; CHECK: bb7:
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; CHECK-NEXT: br i1 undef, label [[BB10:%.*]], label [[BB10]]
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; CHECK: bb10:
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; CHECK-NEXT: br i1 undef, label [[BB12]], label [[BB17_LOOPEXIT:%.*]]
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; CHECK: bb12:
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; CHECK-NEXT: br i1 false, label [[BB13_LOOPEXIT:%.*]], label [[BB2]], !llvm.loop [[LOOP0:![0-9]+]]
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; CHECK: bb13.loopexit:
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; CHECK-NEXT: br label [[BB13]]
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; CHECK: bb13:
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; CHECK-NEXT: [[TMP14]] = add nsw i32 [[TMP]], -1
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; CHECK-NEXT: br label [[BB1]]
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; CHECK: bb15.loopexit:
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; CHECK-NEXT: br label [[BB15:%.*]]
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; CHECK: bb15.loopexit2:
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; CHECK-NEXT: br label [[BB15]]
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; CHECK: bb15:
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; CHECK-NEXT: [[TMP16:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32(i32 17) [ "deopt"() ]
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; CHECK-NEXT: ret i32 [[TMP16]]
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; CHECK: bb17.loopexit:
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; CHECK-NEXT: br label [[BB17:%.*]]
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; CHECK: bb17.loopexit3:
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; CHECK-NEXT: br label [[BB17]]
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; CHECK: bb17:
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; CHECK-NEXT: [[TMP18:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32(i32 6) [ "deopt"() ]
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; CHECK-NEXT: ret i32 [[TMP18]]
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;
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bb:
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br label %bb1
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bb1: ; preds = %bb13, %bb
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%tmp = phi i32 [ -147, %bb ], [ %tmp14, %bb13 ]
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br label %bb2
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bb2: ; preds = %bb12, %bb1
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%tmp3 = phi i32 [ undef, %bb1 ], [ %tmp4, %bb12 ]
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%tmp4 = add nsw i32 %tmp3, %tmp
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br label %bb5
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bb5: ; preds = %bb2
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%tmp6 = icmp eq i32 undef, 33
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br i1 %tmp6, label %bb7, label %bb15
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bb7: ; preds = %bb5
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%tmp8 = sub nsw i32 %tmp3, undef
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%tmp9 = icmp eq i32 %tmp8, 0
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br i1 %tmp9, label %bb10, label %bb10
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bb10: ; preds = %bb7, %bb7
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%tmp11 = icmp eq i8 undef, 0
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br i1 %tmp11, label %bb12, label %bb17
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bb12: ; preds = %bb10
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br i1 false, label %bb13, label %bb2
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bb13: ; preds = %bb12
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%tmp14 = add nsw i32 %tmp, -1
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br label %bb1
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bb15: ; preds = %bb5
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%tmp16 = call i32 (...) @llvm.experimental.deoptimize.i32(i32 17) [ "deopt"() ]
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ret i32 %tmp16
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bb17: ; preds = %bb10
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%tmp18 = call i32 (...) @llvm.experimental.deoptimize.i32(i32 6) [ "deopt"() ]
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ret i32 %tmp18
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}
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declare i32 @llvm.experimental.deoptimize.i32(...)
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