70 lines
2.4 KiB
LLVM
70 lines
2.4 KiB
LLVM
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; RUN: opt -S -disable-output -unroll-partial-threshold=16 -debug-only=loop-unroll -passes='loop-unroll<runtime>' < %s 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; This test is needed to make sure that the guard cost remains the same,
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; independently on guard representation form (either intrinsic call or branch with
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; widenable condition).
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define void @test_guard_as_intrinsic(ptr %arr, i64 %n, i64 %bound) {
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; CHECK-LABEL: Loop Unroll: F[test_guard_as_intrinsic] Loop %loop
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; CHECK-NEXT: Loop Size = 8
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; CHECK-NEXT: runtime unrolling with count: 2
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entry:
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br label %loop
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loop:
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%iv = phi i64 [0, %entry], [%iv.next, %loop]
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%gep = getelementptr i64, ptr %arr, i64 %iv
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%bound_check = icmp ult i64 %iv, %bound
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call void(i1, ...) @llvm.experimental.guard(i1 %bound_check) [ "deopt"() ]
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store i64 %iv, ptr %gep, align 8
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store i64 %iv, ptr %gep, align 8
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%iv.next = add i64 %iv, 1
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%loop_cond = icmp ult i64 %iv, %n
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br i1 %loop_cond, label %loop, label %exit
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exit:
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ret void
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}
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define void @test_guard_as_branch(ptr %arr, i64 %n, i64 %bound) {
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; CHECK-LABEL: Loop Unroll: F[test_guard_as_branch] Loop %loop
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; CHECK-NEXT: Loop Size = 8
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; CHECK-NEXT: runtime unrolling with count: 2
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entry:
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br label %loop
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loop: ; preds = %guarded, %entry
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %guarded ]
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%gep = getelementptr i64, ptr %arr, i64 %iv
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%bound_check = icmp ult i64 %iv, %bound
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%widenable_cond = call i1 @llvm.experimental.widenable.condition()
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%exiplicit_guard_cond = and i1 %bound_check, %widenable_cond
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br i1 %exiplicit_guard_cond, label %guarded, label %deopt, !prof !0
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deopt: ; preds = %loop
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call void (...) @llvm.experimental.deoptimize.isVoid() [ "deopt"() ]
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ret void
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guarded: ; preds = %loop
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store i64 %iv, ptr %gep, align 8
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store i64 %iv, ptr %gep, align 8
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%iv.next = add i64 %iv, 1
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%loop_cond = icmp ult i64 %iv, %n
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br i1 %loop_cond, label %loop, label %exit
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exit: ; preds = %guarded
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ret void
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}
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; Function Attrs: nocallback nofree nosync willreturn
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declare void @llvm.experimental.guard(i1, ...) #0
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declare void @llvm.experimental.deoptimize.isVoid(...)
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; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(inaccessiblemem: readwrite)
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declare i1 @llvm.experimental.widenable.condition() #1
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!0 = !{!"branch_weights", i32 1048576, i32 1}
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