derek.holloway
7502bf64a4
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95 lines
2.7 KiB
LLVM
95 lines
2.7 KiB
LLVM
; RUN: opt -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s
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; This load is safe to speculate, as it's from a safe offset
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; within an alloca.
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; CHECK-LABEL: @yes(
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; CHECK-NOT: br
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define void @yes(i1 %c) nounwind {
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entry:
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%a = alloca [4 x ptr], align 8
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%__a.addr = getelementptr [4 x ptr], ptr %a, i64 0, i64 3
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call void @frob(ptr %__a.addr)
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br i1 %c, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %return
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if.end: ; preds = %entry
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%tmp5 = load ptr, ptr %__a.addr, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%storemerge = phi ptr [ undef, %if.then ], [ %tmp5, %if.end ]
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ret void
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}
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; CHECK-LABEL: @no0(
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; CHECK: br i1 %c
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define void @no0(i1 %c) nounwind {
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entry:
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%a = alloca [4 x ptr], align 8
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%__a.addr = getelementptr [4 x ptr], ptr %a, i64 0, i64 4
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call void @frob(ptr %__a.addr)
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br i1 %c, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %return
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if.end: ; preds = %entry
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%tmp5 = load ptr, ptr %__a.addr, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%storemerge = phi ptr [ undef, %if.then ], [ %tmp5, %if.end ]
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ret void
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}
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; CHECK-LABEL: @no1(
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; CHECK: br i1 %c
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define void @no1(i1 %c, i64 %n) nounwind {
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entry:
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%a = alloca [4 x ptr], align 8
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%__a.addr = getelementptr [4 x ptr], ptr %a, i64 0, i64 %n
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call void @frob(ptr %__a.addr)
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br i1 %c, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %return
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if.end: ; preds = %entry
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%tmp5 = load ptr, ptr %__a.addr, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%storemerge = phi ptr [ undef, %if.then ], [ %tmp5, %if.end ]
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ret void
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}
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; CHECK-LABEL: @no2(
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; CHECK: br i1 %c
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define void @no2(i1 %c, i64 %n) nounwind {
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entry:
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%a = alloca [4 x ptr], align 8
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%__a.addr = getelementptr [4 x ptr], ptr %a, i64 1, i64 0
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call void @frob(ptr %__a.addr)
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br i1 %c, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %return
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if.end: ; preds = %entry
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%tmp5 = load ptr, ptr %__a.addr, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%storemerge = phi ptr [ undef, %if.then ], [ %tmp5, %if.end ]
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ret void
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}
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declare void @frob(ptr nocapture %p)
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