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ab3266d1be
This is no-functional-change-intended. This is repackaging the functionality of D30333 (defer switch-to-lookup-tables) and D35411 (defer folding unconditional branches) with pass parameters rather than a named "latesimplifycfg" pass. Now that we have individual options to control the functionality, we could decouple when these fire (but that's an independent patch if desired). The next planned step would be to add another option bit to disable the sinking transform mentioned in D38566. This should also make it clear that the new pass manager needs to be updated to limit simplifycfg in the same way as the old pass manager. Differential Revision: https://reviews.llvm.org/D38631 llvm-svn: 316835
54 lines
1.6 KiB
LLVM
54 lines
1.6 KiB
LLVM
; RUN: opt -simplifycfg -keep-loops=false -S < %s | FileCheck %s
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define void @test1(i32 %n) #0 {
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entry:
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%n.addr = alloca i32, align 4
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%count = alloca i32, align 4
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store i32 %n, i32* %n.addr, align 4
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%0 = bitcast i32* %count to i8*
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store i32 0, i32* %count, align 4
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br label %while.cond
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while.cond: ; preds = %if.end, %entry
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%1 = load i32, i32* %count, align 4
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%2 = load i32, i32* %n.addr, align 4
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%cmp = icmp ule i32 %1, %2
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br i1 %cmp, label %while.body, label %while.end
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while.body: ; preds = %while.cond
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%3 = load i32, i32* %count, align 4
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%rem = urem i32 %3, 2
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%cmp1 = icmp eq i32 %rem, 0
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br i1 %cmp1, label %if.then, label %if.else
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if.then: ; preds = %while.body
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%4 = load i32, i32* %count, align 4
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%add = add i32 %4, 1
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store i32 %add, i32* %count, align 4
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br label %if.end
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; CHECK: if.then:
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; CHECK: br label %while.cond, !llvm.loop !0
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if.else: ; preds = %while.body
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%5 = load i32, i32* %count, align 4
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%add2 = add i32 %5, 2
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store i32 %add2, i32* %count, align 4
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br label %if.end
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; CHECK: if.else:
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; CHECK: br label %while.cond, !llvm.loop !0
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if.end: ; preds = %if.else, %if.then
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br label %while.cond, !llvm.loop !0
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while.end: ; preds = %while.cond
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%6 = bitcast i32* %count to i8*
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ret void
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}
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!0 = distinct !{!0, !1}
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!1 = !{!"llvm.loop.distribute.enable", i1 true}
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; CHECK: !0 = distinct !{!0, !1}
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; CHECK: !1 = !{!"llvm.loop.distribute.enable", i1 true}
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