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; RUN: opt < %s -correlated-propagation -S | FileCheck %s
; CHECK-LABEL: @simple(
define i8 @simple(i1) {
entry:
%s = select i1 %0, i8 0, i8 1
br i1 %0, label %then, label %else
then:
; CHECK: ret i8 0
%a = phi i8 [ %s, %entry ]
ret i8 %a
else:
; CHECK: ret i8 1
%b = phi i8 [ %s, %entry ]
ret i8 %b
}
; CHECK-LABEL: @loop(
define void @loop(i32) {
entry:
br label %loop
loop:
%idx = phi i32 [ %0, %entry ], [ %sel, %loop ]
; CHECK: %idx = phi i32 [ %0, %entry ], [ %2, %loop ]
%1 = icmp eq i32 %idx, 0
%2 = add i32 %idx, -1
%sel = select i1 %1, i32 0, i32 %2
br i1 %1, label %out, label %loop
out:
ret void
}
; CHECK-LABEL: @not_correlated(
define i8 @not_correlated(i1, i1) {
entry:
%s = select i1 %0, i8 0, i8 1
br i1 %1, label %then, label %else
then:
; CHECK: ret i8 %s
%a = phi i8 [ %s, %entry ]
ret i8 %a
else:
; CHECK: ret i8 %s
%b = phi i8 [ %s, %entry ]
ret i8 %b
}
@c = global i32 0, align 4
@b = global i32 0, align 4
; CHECK-LABEL: @PR23752(
define i32 @PR23752() {
entry:
br label %for.body
for.body:
%phi = phi i32 [ 0, %entry ], [ %sel, %for.body ]
%sel = select i1 icmp sgt (i32* @b, i32* @c), i32 %phi, i32 1
%cmp = icmp ne i32 %sel, 1
br i1 %cmp, label %for.body, label %if.end
; CHECK: %[[sel:.*]] = select i1 icmp sgt (i32* @b, i32* @c), i32 0, i32 1
; CHECK-NEXT: %[[cmp:.*]] = icmp ne i32 %[[sel]], 1
; CHECK-NEXT: br i1 %[[cmp]]
if.end:
ret i32 %sel
; CHECK: ret i32 1
}
define i1 @test1(i32* %p, i1 %unknown) {
; CHECK-LABEL: @test1
%pval = load i32, i32* %p
%cmp1 = icmp slt i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%min = select i1 %unknown, i32 %pval, i32 5
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2:
; CHECK: ret i1 false
%res = icmp eq i32 %min, 255
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
; Check that we take a conservative meet
define i1 @test2(i32* %p, i32 %qval, i1 %unknown) {
; CHECK-LABEL: test2
%pval = load i32, i32* %p
%cmp1 = icmp slt i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%min = select i1 %unknown, i32 %pval, i32 %qval
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2
; CHECK: ret i1 %res
%res = icmp eq i32 %min, 255
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
; Same as @test2, but for the opposite select input
define i1 @test3(i32* %p, i32 %qval, i1 %unknown) {
; CHECK-LABEL: test3
%pval = load i32, i32* %p
%cmp1 = icmp slt i32 %pval, 255
br i1 %cmp1, label %next, label %exit
next:
%min = select i1 %unknown, i32 %qval, i32 %pval
;; TODO: This pointless branch shouldn't be neccessary
br label %next2
next2:
; CHECK-LABEL: next2
; CHECK: ret i1 %res
%res = icmp eq i32 %min, 255
ret i1 %res
exit:
; CHECK-LABEL: exit:
; CHECK: ret i1 true
ret i1 true
}
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