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; if IPSCCP determines a function returns undef,
; then the "returned" attribute of input arguments
; should be cleared.
; RUN: opt < %s -passes=ipsccp -S | FileCheck %s
define i32 @main() {
; CHECK-LABEL: @main
entry:
; CHECK-NEXT: entry:
%call = call i32 @func_return_undef(i32 returned 1)
; CHECK: call i32 @func_return_undef(i32 1)
; CHECK-NOT: returned
ret i32 %call
; CHECK: ret i32 1
}
define internal i32 @func_return_undef(i32 returned %arg) {
; CHECK: {{define.*@func_return_undef}}
; CHECK-NOT: returned
entry:
; CHECK-NEXT: entry:
; CHECK-NEXT: {{ret.*undef}}
ret i32 %arg
}
; The only case that users of zapped functions are non-call site
; users is that they are blockaddr users. Skip them because we
; want to remove the returned attribute for call sites
; CHECK: {{define.*@blockaddr_user}}
; CHECK-NOT: returned
define internal i32 @blockaddr_user(i1 %c, i32 returned %d) {
entry:
br i1 %c, label %bb1, label %bb2
bb1:
br label %branch.block
bb2:
br label %branch.block
branch.block:
%addr = phi ptr [blockaddress(@blockaddr_user, %target1), %bb1], [blockaddress(@blockaddr_user, %target2), %bb2]
indirectbr ptr %addr, [label %target1, label %target2]
target1:
br label %target2
; CHECK: ret i32 undef
target2:
ret i32 %d
}
define i32 @call_blockaddr_user(i1 %c) {
; CHECK-LABEL: define i32 @call_blockaddr_user(
; CHECK-NEXT: %r = call i32 @blockaddr_user(i1 %c
; CHECK-NOT: returned
; CHECK-NEXT: ret i32 10
%r = call i32 @blockaddr_user(i1 %c, i32 returned 10)
ret i32 %r
}
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