61 lines
2.5 KiB
LLVM
61 lines
2.5 KiB
LLVM
; RUN: opt -mtriple=x86_64 -passes='loop-mssa(loop-predication,licm,simple-loop-unswitch<nontrivial>,loop-simplifycfg)' -debug-pass-manager -debug-only=branch-prob -S < %s 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; This test is to solely check that we do not run BPI every single time loop
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; predication is invoked (since BPI is preserved as part of
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; LoopStandardAnalysisResults).
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declare void @llvm.experimental.guard(i1, ...)
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; CHECK: Running pass: LoopPredicationPass on Loop at depth 1
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; CHECK-NEXT: Running pass: LICMPass on Loop at depth 1
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; CHECK-NEXT: Running pass: SimpleLoopUnswitchPass on Loop at depth 1
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; CHECK-NEXT: Running pass: LoopPredicationPass on Loop at depth 1
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; CHECK-NEXT: Running pass: LICMPass on Loop at depth 1
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; CHECK-NEXT: Running pass: SimpleLoopUnswitchPass on Loop at depth 1
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; CHECK-NEXT: Running pass: LoopSimplifyCFGPass on Loop at depth 1
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define i32 @unsigned_loop_0_to_n_ult_check(i32* %array, i32 %length, i32 %n) {
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entry:
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%tmp5 = icmp eq i32 %n, 0
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br i1 %tmp5, label %exit, label %loop.preheader
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loop.preheader: ; preds = %entry
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br label %loop
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loop: ; preds = %guarded, %loop.preheader
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%loop.acc = phi i32 [ %loop.acc.next, %guarded ], [ 0, %loop.preheader ]
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%i = phi i32 [ %i.next, %guarded ], [ 0, %loop.preheader ]
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%within.bounds = icmp ult i32 %i, %length
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%widenable_cond = call i1 @llvm.experimental.widenable.condition()
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%exiplicit_guard_cond = and i1 %within.bounds, %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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%deoptcall = call i32 (...) @llvm.experimental.deoptimize.i32(i32 9) [ "deopt"() ]
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ret i32 %deoptcall
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guarded: ; preds = %loop
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%i.i64 = zext i32 %i to i64
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%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
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%array.i = load i32, i32* %array.i.ptr, align 4
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%loop.acc.next = add i32 %loop.acc, %array.i
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%i.next = add nuw i32 %i, 1
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%continue = icmp ult i32 %i.next, %n
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br i1 %continue, label %loop, label %exit, !prof !2
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exit: ; preds = %guarded, %entry
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%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %guarded ]
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ret i32 %result
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}
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declare i32 @llvm.experimental.deoptimize.i32(...)
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declare i1 @llvm.experimental.widenable.condition() #0
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attributes #0 = { inaccessiblememonly nounwind }
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!0 = !{!"branch_weights", i32 1048576, i32 1}
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!1 = !{i32 1, i32 -2147483648}
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!2 = !{!"branch_weights", i32 1024, i32 1}
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