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https://github.com/c64scene-ar/llvm-6502.git
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554da1a222
We already have HoistThenElseCodeToIf, this patch implements SinkThenElseCodeToEnd. When END block has only two predecessors and each predecessor terminates with unconditional branches, we compare instructions in IF and ELSE blocks backwards and check whether we can sink the common instructions down. rdar://12191395 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164325 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.2 KiB
LLVM
54 lines
1.2 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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define zeroext i1 @test1(i1 zeroext %flag, i32 %blksA, i32 %blksB, i32 %nblks) {
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entry:
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br i1 %flag, label %if.then, label %if.else
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; CHECK: test1
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; CHECK: add
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; CHECK: select
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; CHECK: icmp
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; CHECK-NOT: br
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if.then:
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%cmp = icmp uge i32 %blksA, %nblks
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%frombool1 = zext i1 %cmp to i8
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br label %if.end
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if.else:
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%add = add i32 %nblks, %blksB
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%cmp2 = icmp ule i32 %add, %blksA
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%frombool3 = zext i1 %cmp2 to i8
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br label %if.end
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if.end:
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%obeys.0 = phi i8 [ %frombool1, %if.then ], [ %frombool3, %if.else ]
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%tobool4 = icmp ne i8 %obeys.0, 0
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ret i1 %tobool4
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}
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define zeroext i1 @test2(i1 zeroext %flag, i32 %blksA, i32 %blksB, i32 %nblks) {
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entry:
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br i1 %flag, label %if.then, label %if.else
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; CHECK: test2
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; CHECK: add
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; CHECK: select
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; CHECK: icmp
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; CHECK-NOT: br
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if.then:
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%cmp = icmp uge i32 %blksA, %nblks
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%frombool1 = zext i1 %cmp to i8
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br label %if.end
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if.else:
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%add = add i32 %nblks, %blksB
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%cmp2 = icmp uge i32 %blksA, %add
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%frombool3 = zext i1 %cmp2 to i8
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br label %if.end
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if.end:
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%obeys.0 = phi i8 [ %frombool1, %if.then ], [ %frombool3, %if.else ]
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%tobool4 = icmp ne i8 %obeys.0, 0
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ret i1 %tobool4
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}
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