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; RUN: opt -correlated-propagation -S < %s | FileCheck %s
declare i32 @foo()
define i32 @test1(i32 %a) nounwind {
%a.off = add i32 %a, -8
%cmp = icmp ult i32 %a.off, 8
br i1 %cmp, label %then, label %else
then:
%dead = icmp eq i32 %a, 7
br i1 %dead, label %end, label %else
else:
ret i32 1
end:
ret i32 2
; CHECK: @test1
; CHECK: then:
; CHECK-NEXT: br i1 false, label %end, label %else
}
define i32 @test2(i32 %a) nounwind {
%a.off = add i32 %a, -8
%cmp = icmp ult i32 %a.off, 8
br i1 %cmp, label %then, label %else
then:
%dead = icmp ugt i32 %a, 15
br i1 %dead, label %end, label %else
else:
ret i32 1
end:
ret i32 2
; CHECK: @test2
; CHECK: then:
; CHECK-NEXT: br i1 false, label %end, label %else
}
; CHECK: @test3
define i32 @test3(i32 %c) nounwind {
%cmp = icmp slt i32 %c, 2
br i1 %cmp, label %if.then, label %if.end
if.then:
ret i32 1
if.end:
%cmp1 = icmp slt i32 %c, 3
br i1 %cmp1, label %if.then2, label %if.end8
; CHECK: if.then2
if.then2:
%cmp2 = icmp eq i32 %c, 2
; CHECK: br i1 true
br i1 %cmp2, label %if.then4, label %if.end6
; CHECK: if.end6
if.end6:
ret i32 2
if.then4:
ret i32 3
if.end8:
ret i32 4
}
; CHECK: @test4
define i32 @test4(i32 %c) nounwind {
switch i32 %c, label %sw.default [
i32 1, label %sw.bb
i32 2, label %sw.bb
i32 4, label %sw.bb
]
; CHECK: sw.bb
sw.bb:
%cmp = icmp sge i32 %c, 1
; CHECK: br i1 true
br i1 %cmp, label %if.then, label %if.end
if.then:
br label %return
if.end:
br label %return
sw.default:
br label %return
return:
%retval.0 = phi i32 [ 42, %sw.default ], [ 4, %if.then ], [ 9, %if.end ]
ret i32 %retval.0
}
; CHECK: @test5
define i1 @test5(i32 %c) nounwind {
%cmp = icmp slt i32 %c, 5
br i1 %cmp, label %if.then, label %if.end
if.then:
%cmp1 = icmp eq i32 %c, 4
br i1 %cmp1, label %if.end, label %if.end8
if.end:
ret i1 true
if.end8:
%cmp2 = icmp eq i32 %c, 3
%cmp3 = icmp eq i32 %c, 4
%cmp4 = icmp eq i32 %c, 6
; CHECK: %or = or i1 false, false
%or = or i1 %cmp3, %cmp4
; CHECK: ret i1 %cmp2
ret i1 %cmp2
}
; CHECK: @test6
define i1 @test6(i32 %c) nounwind {
%cmp = icmp ule i32 %c, 7
br i1 %cmp, label %if.then, label %if.end
if.then:
; CHECK: icmp eq i32 %c, 6
; CHECK: br i1
switch i32 %c, label %if.end [
i32 6, label %sw.bb
i32 8, label %sw.bb
]
if.end:
ret i1 true
sw.bb:
%cmp2 = icmp eq i32 %c, 6
; CHECK: ret i1 true
ret i1 %cmp2
}
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