aa2009fe78
First step after e113317958,
in these tests, DomTree is valid afterwards, so mark them as such,
so that they don't regress.
In further steps, SimplifyCFG transforms shall taught to preserve DomTree,
in as small steps as possible.
41 lines
1.1 KiB
LLVM
41 lines
1.1 KiB
LLVM
; RUN: opt -S -simplifycfg -simplifycfg-require-and-preserve-domtree=1 < %s | FileCheck %s
|
|
|
|
; We're sign extending an 8-bit value.
|
|
; The switch condition must be in the range [-128, 127], so any cases outside of that range must be dead.
|
|
; Only the first case has a non-zero weight, but that gets eliminated. Note
|
|
; that this shouldn't have been the case in the first place, but the test here
|
|
; ensures that all-zero branch weights are not attached causing problems downstream.
|
|
|
|
define i1 @repeated_signbits(i8 %condition) {
|
|
; CHECK-LABEL: @repeated_signbits(
|
|
; CHECK: switch i32
|
|
; CHECK-DAG: i32 -128, label %a
|
|
; CHECK-DAG: i32 -1, label %a
|
|
; CHECK-DAG: i32 0, label %a
|
|
; CHECK-DAG: i32 127, label %a
|
|
; CHECK-NEXT: ]
|
|
; CHECK-NOT: , !prof
|
|
;
|
|
entry:
|
|
%sext = sext i8 %condition to i32
|
|
switch i32 %sext, label %default [
|
|
i32 -2147483648, label %a
|
|
i32 -129, label %a
|
|
i32 -128, label %a
|
|
i32 -1, label %a
|
|
i32 0, label %a
|
|
i32 127, label %a
|
|
i32 128, label %a
|
|
i32 2147483647, label %a
|
|
], !prof !1
|
|
|
|
a:
|
|
ret i1 1
|
|
|
|
default:
|
|
ret i1 0
|
|
}
|
|
|
|
!1 = !{!"branch_weights", i32 0, i32 1, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0}
|
|
|