49 lines
1.7 KiB
LLVM
49 lines
1.7 KiB
LLVM
; RUN: opt -loop-unswitch-memoryssa-threshold=0 -memssa-check-limit=1 -passes='loop-mssa(simple-loop-unswitch<nontrivial>),verify<loops>' -S < %s | FileCheck --check-prefix=THRESHOLD-0 %s
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; RUN: opt -memssa-check-limit=1 -passes='loop-mssa(simple-loop-unswitch<nontrivial>),verify<loops>' -S < %s | FileCheck --check-prefix=THRESHOLD-DEFAULT %s
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; Make sure -loop-unswitch-memoryssa-threshold works. The test uses
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; -memssa-check-limit=1 to effectively disable any MemorySSA optimizations
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; on construction, so the test can be kept simple.
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declare void @clobber()
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; Partial unswitching is possible, because the store in %noclobber does not
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; alias the load of the condition.
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define i32 @partial_unswitch_true_successor_noclobber(i32* noalias %ptr.1, i32* noalias %ptr.2, i32 %N) {
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; THRESHOLD-0-LABEL: @partial_unswitch_true_successor
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; THRESHOLD-0: entry:
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; THRESHOLD-0: br label %loop.header
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;
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; THRESHOLD-DEFAULT-LABEL: @partial_unswitch_true_successor
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; THRESHOLD-DEFAULT-NEXT: entry:
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; THRESHOLD-DEFAULT-NEXT: [[LV:%[0-9]+]] = load i32, i32* %ptr.1, align 4
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; THRESHOLD-DEFAULT-NEXT: [[C:%[0-9]+]] = icmp eq i32 [[LV]], 100
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; THRESHOLD-DEFAULT-NEXT: br i1 [[C]]
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;
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entry:
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br label %loop.header
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loop.header:
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%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
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%lv = load i32, i32* %ptr.1
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%sc = icmp eq i32 %lv, 100
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br i1 %sc, label %noclobber, label %clobber
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noclobber:
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%gep.1 = getelementptr i32, i32* %ptr.2, i32 %iv
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store i32 %lv, i32* %gep.1
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br label %loop.latch
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clobber:
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call void @clobber()
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br label %loop.latch
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loop.latch:
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%c = icmp ult i32 %iv, %N
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%iv.next = add i32 %iv, 1
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br i1 %c, label %loop.header, label %exit
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exit:
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ret i32 10
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}
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