6c767cef5a
Canonicalize GEP of GEP by swapping GEP with some suffix constant indices to the back (and GEP with all constant indices to the back of that), this allows more constant index GEP merging to happen. Exceptions are: If swapping violates use-def relations, or anti-optimizes LICM For constant indexed GEP of GEP, if they cannot be merged directly, they will be casted to i8* and merged. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D125845
67 lines
3.0 KiB
LLVM
67 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -O2 < %s | FileCheck %s
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; Test a single-iteration loop that should get SROAd once we realize that fact.
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; It should compile down to a bswap.
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; The helper function exists to avoid IPSCCP breaking the loop too early.
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define i16 @helper(i16 %0, i64 %x) {
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; CHECK-LABEL: @helper(
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; CHECK-NEXT: start:
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; CHECK-NEXT: [[DATA:%.*]] = alloca [2 x i8], align 2
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; CHECK-NEXT: store i16 [[TMP0:%.*]], ptr [[DATA]], align 2
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; CHECK-NEXT: br label [[BB6_I_I:%.*]]
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; CHECK: bb6.i.i:
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; CHECK-NEXT: [[ITER_SROA_0_07_I_I:%.*]] = phi i64 [ [[TMP2:%.*]], [[BB6_I_I]] ], [ 0, [[START:%.*]] ]
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; CHECK-NEXT: [[_40_I_I:%.*]] = sub nsw i64 0, [[ITER_SROA_0_07_I_I]]
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; CHECK-NEXT: [[TMP2]] = add nuw nsw i64 [[ITER_SROA_0_07_I_I]], 1
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; CHECK-NEXT: [[_34_I_I:%.*]] = getelementptr inbounds [0 x i8], ptr [[DATA]], i64 0, i64 [[ITER_SROA_0_07_I_I]]
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr [0 x i8], ptr [[DATA]], i64 0, i64 [[_40_I_I]]
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; CHECK-NEXT: [[_39_I_I:%.*]] = getelementptr i8, ptr [[TMP1:%.*]], i64 1
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; CHECK-NEXT: [[TMP_0_COPYLOAD_I_I_I_I:%.*]] = load i8, ptr [[_34_I_I]], align 1
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; CHECK-NEXT: [[TMP2_0_COPYLOAD_I_I_I_I:%.*]] = load i8, ptr [[_39_I_I]], align 1
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; CHECK-NEXT: store i8 [[TMP2_0_COPYLOAD_I_I_I_I]], ptr [[_34_I_I]], align 1
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; CHECK-NEXT: store i8 [[TMP_0_COPYLOAD_I_I_I_I]], ptr [[_39_I_I]], align 1
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; CHECK-NEXT: [[EXITCOND_NOT_I_I:%.*]] = icmp eq i64 [[TMP2]], [[X:%.*]]
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; CHECK-NEXT: br i1 [[EXITCOND_NOT_I_I]], label [[EXIT:%.*]], label [[BB6_I_I]]
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; CHECK: exit:
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; CHECK-NEXT: [[DOTSROA_0_0_COPYLOAD:%.*]] = load i16, ptr [[DATA]], align 2
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; CHECK-NEXT: ret i16 [[DOTSROA_0_0_COPYLOAD]]
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;
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start:
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%data = alloca [2 x i8], align 2
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store i16 %0, ptr %data, align 2
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%1 = getelementptr inbounds i8, ptr %data, i64 2
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%2 = getelementptr inbounds i8, ptr %1, i64 -1
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br label %bb6.i.i
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bb6.i.i:
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%iter.sroa.0.07.i.i = phi i64 [ %4, %bb6.i.i ], [ 0, %start ]
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%3 = xor i64 %iter.sroa.0.07.i.i, -1
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%_40.i.i = add nsw i64 1, %3
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%4 = add nuw nsw i64 %iter.sroa.0.07.i.i, 1
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%_34.i.i = getelementptr inbounds [0 x i8], ptr %data, i64 0, i64 %iter.sroa.0.07.i.i
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%_39.i.i = getelementptr inbounds [0 x i8], ptr %2, i64 0, i64 %_40.i.i
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%tmp.0.copyload.i.i.i.i = load i8, ptr %_34.i.i, align 1
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%tmp2.0.copyload.i.i.i.i = load i8, ptr %_39.i.i, align 1
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store i8 %tmp2.0.copyload.i.i.i.i, ptr %_34.i.i, align 1
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store i8 %tmp.0.copyload.i.i.i.i, ptr %_39.i.i, align 1
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%exitcond.not.i.i = icmp eq i64 %4, %x
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br i1 %exitcond.not.i.i, label %exit, label %bb6.i.i
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exit:
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%.sroa.0.0.copyload = load i16, ptr %data, align 2
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ret i16 %.sroa.0.0.copyload
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}
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define i16 @test(i16 %arg) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: bb6.i.i.i:
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; CHECK-NEXT: [[DATA_I_SROA_0_0_INSERT_INSERT:%.*]] = tail call i16 @llvm.bswap.i16(i16 [[ARG:%.*]])
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; CHECK-NEXT: ret i16 [[DATA_I_SROA_0_0_INSERT_INSERT]]
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;
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%ret = call i16 @helper(i16 %arg, i64 1)
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ret i16 %ret
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}
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