derek.holloway
7502bf64a4
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94 lines
4.2 KiB
LLVM
94 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -passes=loop-unroll -mattr=+no-default-unroll | FileCheck %s
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; Regression test: when a loop has a small MaxTripCount and falls through to
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; runtime unrolling, the unroll count should be based on DefaultUnrollRuntimeCount
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; (not MaxTripCount). Previously, a quirk would set UP.Count = MaxTripCount (5)
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; before the power-of-two reduction, yielding count 2 (5 >> 1). Now the count
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; starts at DefaultUnrollRuntimeCount (8) and reduces to 4 (8 >> 1).
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;
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; This test uses RISC-V because we need a target that sets UP.Force = true
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; (via RISCVTTIImpl::getUnrollingPreferences) to trigger the bug.
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target triple = "riscv64-unknown-linux-gnu"
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define void @test(i32 %start, ptr %p) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[END:%.*]] = add i32 [[START:%.*]], 5
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START]], [[ENTRY:%.*]] ], [ [[IV_NEXT_3:%.*]], [[LOOP_3:%.*]] ]
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i32 [[IV]]
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; CHECK-NEXT: [[V:%.*]] = load volatile i32, ptr [[GEP]], align 4
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; CHECK-NEXT: store volatile i32 [[V]], ptr [[GEP]], align 4
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; CHECK-NEXT: [[IV_NEXT:%.*]] = add nuw i32 [[IV]], 1
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[IV_NEXT]], [[END]]
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; CHECK-NEXT: br i1 [[CMP]], label [[LOOP_1:%.*]], label [[EXIT:%.*]]
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; CHECK: loop.1:
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; CHECK-NEXT: [[GEP_1:%.*]] = getelementptr inbounds i32, ptr [[P]], i32 [[IV_NEXT]]
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; CHECK-NEXT: [[V_1:%.*]] = load volatile i32, ptr [[GEP_1]], align 4
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; CHECK-NEXT: store volatile i32 [[V_1]], ptr [[GEP_1]], align 4
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; CHECK-NEXT: [[IV_NEXT_1:%.*]] = add nuw i32 [[IV]], 2
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; CHECK-NEXT: [[CMP_1:%.*]] = icmp ult i32 [[IV_NEXT_1]], [[END]]
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; CHECK-NEXT: br i1 [[CMP_1]], label [[LOOP_2:%.*]], label [[EXIT]]
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; CHECK: loop.2:
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; CHECK-NEXT: [[GEP_2:%.*]] = getelementptr inbounds i32, ptr [[P]], i32 [[IV_NEXT_1]]
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; CHECK-NEXT: [[V_2:%.*]] = load volatile i32, ptr [[GEP_2]], align 4
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; CHECK-NEXT: store volatile i32 [[V_2]], ptr [[GEP_2]], align 4
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; CHECK-NEXT: [[IV_NEXT_2:%.*]] = add nuw i32 [[IV]], 3
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; CHECK-NEXT: [[CMP_2:%.*]] = icmp ult i32 [[IV_NEXT_2]], [[END]]
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; CHECK-NEXT: br i1 [[CMP_2]], label [[LOOP_3]], label [[EXIT]]
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; CHECK: loop.3:
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; CHECK-NEXT: [[GEP_3:%.*]] = getelementptr inbounds i32, ptr [[P]], i32 [[IV_NEXT_2]]
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; CHECK-NEXT: [[V_3:%.*]] = load volatile i32, ptr [[GEP_3]], align 4
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; CHECK-NEXT: store volatile i32 [[V_3]], ptr [[GEP_3]], align 4
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; CHECK-NEXT: [[IV_NEXT_3]] = add nuw i32 [[IV]], 4
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; CHECK-NEXT: [[CMP_3:%.*]] = icmp ult i32 [[IV_NEXT_3]], [[END]]
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; CHECK-NEXT: br i1 [[CMP_3]], label [[LOOP]], label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%end = add i32 %start, 5
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br label %loop
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loop:
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%iv = phi i32 [ %start, %entry ], [ %iv.next, %loop ]
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%gep = getelementptr inbounds i32, ptr %p, i32 %iv
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%v = load volatile i32, ptr %gep
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%b0 = call i32 @llvm.bswap.i32(i32 %v)
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%b1 = call i32 @llvm.bswap.i32(i32 %b0)
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%b2 = call i32 @llvm.bswap.i32(i32 %b1)
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%b3 = call i32 @llvm.bswap.i32(i32 %b2)
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%b4 = call i32 @llvm.bswap.i32(i32 %b3)
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%b5 = call i32 @llvm.bswap.i32(i32 %b4)
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%b6 = call i32 @llvm.bswap.i32(i32 %b5)
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%b7 = call i32 @llvm.bswap.i32(i32 %b6)
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%b8 = call i32 @llvm.bswap.i32(i32 %b7)
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%b9 = call i32 @llvm.bswap.i32(i32 %b8)
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%b10 = call i32 @llvm.bswap.i32(i32 %b9)
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%b11 = call i32 @llvm.bswap.i32(i32 %b10)
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%b12 = call i32 @llvm.bswap.i32(i32 %b11)
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%b13 = call i32 @llvm.bswap.i32(i32 %b12)
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%b14 = call i32 @llvm.bswap.i32(i32 %b13)
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%b15 = call i32 @llvm.bswap.i32(i32 %b14)
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%b16 = call i32 @llvm.bswap.i32(i32 %b15)
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%b17 = call i32 @llvm.bswap.i32(i32 %b16)
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%b18 = call i32 @llvm.bswap.i32(i32 %b17)
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%b19 = call i32 @llvm.bswap.i32(i32 %b18)
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%b20 = call i32 @llvm.bswap.i32(i32 %b19)
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%b21 = call i32 @llvm.bswap.i32(i32 %b20)
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%b22 = call i32 @llvm.bswap.i32(i32 %b21)
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%b23 = call i32 @llvm.bswap.i32(i32 %b22)
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%b24 = call i32 @llvm.bswap.i32(i32 %b23)
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%b25 = call i32 @llvm.bswap.i32(i32 %b24)
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store volatile i32 %b25, ptr %gep
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%iv.next = add nuw i32 %iv, 1
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%cmp = icmp ult i32 %iv.next, %end
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br i1 %cmp, label %loop, label %exit
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exit:
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ret void
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}
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