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1aa6c6adf1
This is similar to D18133 where we allowed profile weights on select instructions. This extends that change to also allow the 'unpredictable' attribute of branches to apply to selects. A test to check that 'unpredictable' metadata is preserved when cloning instructions was checked in at: http://reviews.llvm.org/rL263648 Differential Revision: http://reviews.llvm.org/D18220 llvm-svn: 263716
35 lines
1.0 KiB
LLVM
35 lines
1.0 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; Use a select to make this a single BB.
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; Also, make sure the profile metadata is propagated to the select (PR26636).
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define i32 @FoldTwoEntryPHINode(i1 %C, i32 %V1, i32 %V2, i16 %V3) {
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entry:
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br i1 %C, label %then, label %else, !prof !0, !unpredictable !1
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then:
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%V4 = or i32 %V2, %V1
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br label %Cont
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else:
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%V5 = sext i16 %V3 to i32
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br label %Cont
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Cont:
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%V6 = phi i32 [ %V5, %else ], [ %V4, %then ]
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call i32 @FoldTwoEntryPHINode( i1 false, i32 0, i32 0, i16 0 )
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ret i32 %V1
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; CHECK-LABEL: @FoldTwoEntryPHINode(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %V5 = sext i16 %V3 to i32
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; CHECK-NEXT: %V4 = or i32 %V2, %V1
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; CHECK-NEXT: %V6 = select i1 %C, i32 %V4, i32 %V5, !prof !0, !unpredictable !1
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; CHECK-NEXT: %0 = call i32 @FoldTwoEntryPHINode(i1 false, i32 0, i32 0, i16 0)
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; CHECK-NEXT: ret i32 %V1
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}
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!0 = !{!"branch_weights", i32 3, i32 5}
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!1 = !{}
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; CHECK: !0 = !{!"branch_weights", i32 3, i32 5}
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; CHECK: !1 = !{}
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