derek.holloway
7502bf64a4
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124 lines
2.7 KiB
LLVM
124 lines
2.7 KiB
LLVM
; RUN: opt < %s -passes=jump-threading -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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target triple = "i386-apple-darwin7"
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declare void @use(ptr)
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; Check that we propagate nonnull to dominated loads, when we find an available
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; loaded value.
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; CHECK-LABEL: @test1(
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; CHECK-LABEL: ret1:
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; CHECK-NEXT: %[[p1:.*]] = load ptr, ptr %ptr
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; CHECK-NOT: !nonnull
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; CHECK-NEXT: store i32 1, ptr %[[p1]]
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; CHECK-NEXT: tail call void @use(ptr null)
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; CHECK-NEXT: ret void
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; CHECK-LABEL: ret2:
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; CHECK-NEXT: %[[p2:.*]] = load ptr, ptr %ptr, align 4, !nonnull !0
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; CHECK: tail call void @use(ptr %[[p2]])
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; CHECK-NEXT: ret void
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define void @test1(ptr %ptr, i1 %c) {
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br i1 %c, label %d1, label %d2
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d1:
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%p1 = load ptr, ptr %ptr, !nonnull !0
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br label %d3
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d2:
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br label %d3
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d3:
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%pm = phi ptr [ null, %d2 ], [ %p1, %d1 ]
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%p2 = load ptr, ptr %ptr
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store i32 1, ptr %p2
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%c2 = icmp eq ptr %pm, null
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br i1 %c2, label %ret1, label %ret2
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ret1:
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tail call void @use(ptr %pm) nounwind
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ret void
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ret2:
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tail call void @use(ptr %pm) nounwind
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ret void
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}
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; Check that we propagate nonnull to dominated loads, when we find an available
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; loaded value.
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; CHECK-LABEL: @test2(
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; CHECK-LABEL: d3.thread:
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; CHECK-NEXT: %[[p1:.*]] = load ptr, ptr %ptr, align 4, !nonnull !0
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; CHECK-NEXT: store i32 1, ptr %[[p1]]
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; CHECK-NEXT: br label %ret1
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; CHECK-LABEL: d3:
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; CHECK-NEXT: %[[p_cmp:.*]] = load ptr, ptr %ptr
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; CHECK-NEXT: %[[p2:.*]] = load ptr, ptr %ptr, align 4, !nonnull !0
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; CHECK-NEXT: store i32 1, ptr %[[p2]]
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; CHECK-NEXT: icmp eq ptr %[[p_cmp]], null
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define void @test2(ptr %ptr, i1 %c) {
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br i1 %c, label %d1, label %d2
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d1:
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%p1 = load ptr, ptr %ptr
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br label %d3
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d2:
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br label %d3
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d3:
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%pm = phi ptr [ null, %d2 ], [ %p1, %d1 ]
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%p2 = load ptr, ptr %ptr, !nonnull !0
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store i32 1, ptr %p2
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%c2 = icmp eq ptr %pm, null
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br i1 %c2, label %ret1, label %ret2
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ret1:
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tail call void @use(ptr %pm) nounwind
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ret void
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ret2:
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tail call void @use(ptr %pm) nounwind
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ret void
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}
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; Check that we do not propagate nonnull to loads predecessors that are combined
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; to a PHI node.
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; CHECK-LABEL: @test3(
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; CHECK-LABEL: d1:
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; CHECK-NEXT: %[[p1:.*]] = load ptr, ptr %ptr
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; CHECK-NOT: !nonnull
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; CHECK-LABEL: d2:
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; CHECK-NEXT: %[[p2:.*]] = load ptr, ptr %ptr
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; CHECK-NOT: !nonnull
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; CHECK-LABEL: d3:
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; CHECK-NEXT: phi ptr [ %[[p2]], %d2 ], [ %[[p1]], %d1 ]
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define void @test3(ptr %ptr) {
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d1:
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%x = load ptr, ptr %ptr, !nonnull !0
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br label %d3
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d2:
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br label %d3
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d3:
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%y = load ptr, ptr %ptr
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store i32 1, ptr %y
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%c2 = icmp eq ptr %y, @p
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br i1 %c2, label %ret1, label %ret2
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ret1:
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ret void
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ret2:
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ret void
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}
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@p = external global i32
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!0 = !{}
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