mirror of
https://github.com/c64scene-ar/llvm-6502.git
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33756f96d7
logic by half: isOnlyReachableViaThisEdge was trying to be clever and handle the case of a branch to a basic block which is contained in a loop. This costs a domtree lookup and is completely useless due to GVN's position in the pass pipeline: all loops have preheaders at this point, which means it is enough for isOnlyReachableViaThisEdge to check that Dst has only one predecessor. (I checked this theoretical argument by running over the entire nightly testsuite, and indeed it is so!). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149838 91177308-0d34-0410-b5e6-96231b3b80d8
114 lines
2.3 KiB
LLVM
114 lines
2.3 KiB
LLVM
; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
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@a = external global i32 ; <i32*> [#uses=7]
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; CHECK: @test1
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define i32 @test1() nounwind {
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entry:
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%0 = load i32* @a, align 4
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%1 = icmp eq i32 %0, 4
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br i1 %1, label %bb, label %bb1
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bb: ; preds = %entry
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br label %bb8
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bb1: ; preds = %entry
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%2 = load i32* @a, align 4
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%3 = icmp eq i32 %2, 5
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br i1 %3, label %bb2, label %bb3
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bb2: ; preds = %bb1
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br label %bb8
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bb3: ; preds = %bb1
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%4 = load i32* @a, align 4
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%5 = icmp eq i32 %4, 4
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; CHECK: br i1 false, label %bb4, label %bb5
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br i1 %5, label %bb4, label %bb5
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bb4: ; preds = %bb3
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%6 = load i32* @a, align 4
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%7 = add i32 %6, 5
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br label %bb8
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bb5: ; preds = %bb3
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%8 = load i32* @a, align 4
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%9 = icmp eq i32 %8, 5
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; CHECK: br i1 false, label %bb6, label %bb7
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br i1 %9, label %bb6, label %bb7
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bb6: ; preds = %bb5
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%10 = load i32* @a, align 4
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%11 = add i32 %10, 4
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br label %bb8
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bb7: ; preds = %bb5
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%12 = load i32* @a, align 4
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br label %bb8
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bb8: ; preds = %bb7, %bb6, %bb4, %bb2, %bb
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%.0 = phi i32 [ %12, %bb7 ], [ %11, %bb6 ], [ %7, %bb4 ], [ 4, %bb2 ], [ 5, %bb ]
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br label %return
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return: ; preds = %bb8
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ret i32 %.0
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}
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declare void @foo(i1)
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declare void @bar(i32)
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; CHECK: @test3
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define void @test3(i32 %x, i32 %y) {
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%xz = icmp eq i32 %x, 0
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%yz = icmp eq i32 %y, 0
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%z = and i1 %xz, %yz
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br i1 %z, label %both_zero, label %nope
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both_zero:
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call void @foo(i1 %xz)
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; CHECK: call void @foo(i1 true)
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call void @foo(i1 %yz)
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; CHECK: call void @foo(i1 true)
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call void @bar(i32 %x)
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; CHECK: call void @bar(i32 0)
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call void @bar(i32 %y)
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; CHECK: call void @bar(i32 0)
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ret void
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nope:
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call void @foo(i1 %z)
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; CHECK: call void @foo(i1 false)
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ret void
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}
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; CHECK: @test4
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define void @test4(i1 %b, i32 %x) {
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br i1 %b, label %sw, label %case3
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sw:
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switch i32 %x, label %default [
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i32 0, label %case0
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i32 1, label %case1
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i32 2, label %case0
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i32 3, label %case3
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i32 4, label %default
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]
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default:
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; CHECK: default:
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call void @bar(i32 %x)
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; CHECK: call void @bar(i32 %x)
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ret void
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case0:
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; CHECK: case0:
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call void @bar(i32 %x)
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; CHECK: call void @bar(i32 %x)
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ret void
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case1:
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; CHECK: case1:
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call void @bar(i32 %x)
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; CHECK: call void @bar(i32 1)
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ret void
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case3:
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; CHECK: case3:
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call void @bar(i32 %x)
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; CHECK: call void @bar(i32 %x)
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ret void
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}
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