; RUN: opt -function-attrs -S < %s | FileCheck %s --check-prefix=FNATTR
;
; Test cases specifically designed for the "returned" argument attribute.
; We use FIXME's to indicate problems and missing attributes.
;
; TEST SCC test returning an integer value argument
;
;
; FNATTR: define i32 @sink_r0(i32 returned %r)
; FNATTR: define i32 @scc_r1(i32 %a, i32 %r, i32 %b)
; FNATTR: define i32 @scc_r2(i32 %a, i32 %b, i32 %r)
; FNATTR: define i32 @scc_rX(i32 %a, i32 %b, i32 %r)
;
;
; int scc_r1(int a, int b, int r);
; int scc_r2(int a, int b, int r);
;
; __attribute__((noinline)) int sink_r0(int r) {
; return r;
; }
;
; __attribute__((noinline)) int scc_r1(int a, int r, int b) {
; return scc_r2(r, a, sink_r0(r));
; }
;
; __attribute__((noinline)) int scc_r2(int a, int b, int r) {
; if (a > b)
; return scc_r2(b, a, sink_r0(r));
; if (a < b)
; return scc_r1(sink_r0(b), scc_r2(scc_r1(a, b, r), scc_r1(a, scc_r2(r, r, r), r), scc_r2(a, b, r)), scc_r1(a, b, r));
; return a == b ? r : scc_r2(a, b, r);
; }
; __attribute__((noinline)) int scc_rX(int a, int b, int r) {
; if (a > b)
; return scc_r2(b, a, sink_r0(r));
; if (a < b) // V Diff to scc_r2
; return scc_r1(sink_r0(b), scc_r2(scc_r1(a, b, r), scc_r1(a, scc_r2(r, r, r), r), scc_r1(a, b, r)), scc_r1(a, b, r));
; return a == b ? r : scc_r2(a, b, r);
; }
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define i32 @sink_r0(i32 %r) #0 {
entry:
ret i32 %r
}
define i32 @scc_r1(i32 %a, i32 %r, i32 %b) #0 {
entry:
%call = call i32 @sink_r0(i32 %r)
%call1 = call i32 @scc_r2(i32 %r, i32 %a, i32 %call)
ret i32 %call1
}
define i32 @scc_r2(i32 %a, i32 %b, i32 %r) #0 {
entry:
%cmp = icmp sgt i32 %a, %b
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%call = call i32 @sink_r0(i32 %r)
%call1 = call i32 @scc_r2(i32 %b, i32 %a, i32 %call)
br label %return
if.end: ; preds = %entry
%cmp2 = icmp slt i32 %a, %b
br i1 %cmp2, label %if.then3, label %if.end12
if.then3: ; preds = %if.end
%call4 = call i32 @sink_r0(i32 %b)
%call5 = call i32 @scc_r1(i32 %a, i32 %b, i32 %r)
%call6 = call i32 @scc_r2(i32 %r, i32 %r, i32 %r)
%call7 = call i32 @scc_r1(i32 %a, i32 %call6, i32 %r)
%call8 = call i32 @scc_r2(i32 %a, i32 %b, i32 %r)
%call9 = call i32 @scc_r2(i32 %call5, i32 %call7, i32 %call8)
%call10 = call i32 @scc_r1(i32 %a, i32 %b, i32 %r)
%call11 = call i32 @scc_r1(i32 %call4, i32 %call9, i32 %call10)
br label %return
if.end12: ; preds = %if.end
%cmp13 = icmp eq i32 %a, %b
br i1 %cmp13, label %cond.true, label %cond.false
cond.true: ; preds = %if.end12
br label %cond.end
cond.false: ; preds = %if.end12
%call14 = call i32 @scc_r2(i32 %a, i32 %b, i32 %r)
br label %cond.end
cond.end: ; preds = %cond.false, %cond.true
%cond = phi i32 [ %r, %cond.true ], [ %call14, %cond.false ]
br label %return
return: ; preds = %cond.end, %if.then3, %if.then
%retval.0 = phi i32 [ %call1, %if.then ], [ %call11, %if.then3 ], [ %cond, %cond.end ]
ret i32 %retval.0
}
define i32 @scc_rX(i32 %a, i32 %b, i32 %r) #0 {
entry:
%cmp = icmp sgt i32 %a, %b
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%call = call i32 @sink_r0(i32 %r)
%call1 = call i32 @scc_r2(i32 %b, i32 %a, i32 %call)
br label %return
if.end: ; preds = %entry
%cmp2 = icmp slt i32 %a, %b
br i1 %cmp2, label %if.then3, label %if.end12
if.then3: ; preds = %if.end
%call4 = call i32 @sink_r0(i32 %b)
%call5 = call i32 @scc_r1(i32 %a, i32 %b, i32 %r)
%call6 = call i32 @scc_r2(i32 %r, i32 %r, i32 %r)
%call7 = call i32 @scc_r1(i32 %a, i32 %call6, i32 %r)
%call8 = call i32 @scc_r1(i32 %a, i32 %b, i32 %r)
%call9 = call i32 @scc_r2(i32 %call5, i32 %call7, i32 %call8)
%call10 = call i32 @scc_r1(i32 %a, i32 %b, i32 %r)
%call11 = call i32 @scc_r1(i32 %call4, i32 %call9, i32 %call10)
br label %return
if.end12: ; preds = %if.end
%cmp13 = icmp eq i32 %a, %b
br i1 %cmp13, label %cond.true, label %cond.false
cond.true: ; preds = %if.end12
br label %cond.end
cond.false: ; preds = %if.end12
%call14 = call i32 @scc_r2(i32 %a, i32 %b, i32 %r)
br label %cond.end
cond.end: ; preds = %cond.false, %cond.true
%cond = phi i32 [ %r, %cond.true ], [ %call14, %cond.false ]
br label %return
return: ; preds = %cond.end, %if.then3, %if.then
%retval.0 = phi i32 [ %call1, %if.then ], [ %call11, %if.then3 ], [ %cond, %cond.end ]
ret i32 %retval.0
}
; TEST SCC test returning a pointer value argument
;
; FNATTR: define double* @ptr_sink_r0(double* readnone returned %r)
; FNATTR: define double* @ptr_scc_r1(double* %a, double* readnone %r, double* nocapture readnone %b)
; FNATTR: define double* @ptr_scc_r2(double* readnone %a, double* readnone %b, double* readnone %r)
;
;
; double* ptr_scc_r1(double* a, double* b, double* r);
; double* ptr_scc_r2(double* a, double* b, double* r);
;
; __attribute__((noinline)) double* ptr_sink_r0(double* r) {
; return r;
; }
;
; __attribute__((noinline)) double* ptr_scc_r1(double* a, double* r, double* b) {
; return ptr_scc_r2(r, a, ptr_sink_r0(r));
; }
;
; __attribute__((noinline)) double* ptr_scc_r2(double* a, double* b, double* r) {
; if (a > b)
; return ptr_scc_r2(b, a, ptr_sink_r0(r));
; if (a < b)
; return ptr_scc_r1(ptr_sink_r0(b), ptr_scc_r2(ptr_scc_r1(a, b, r), ptr_scc_r1(a, ptr_scc_r2(r, r, r), r), ptr_scc_r2(a, b, r)), ptr_scc_r1(a, b, r));
; return a == b ? r : ptr_scc_r2(a, b, r);
; }
define double* @ptr_sink_r0(double* %r) #0 {
entry:
ret double* %r
}
define double* @ptr_scc_r1(double* %a, double* %r, double* %b) #0 {
entry:
%call = call double* @ptr_sink_r0(double* %r)
%call1 = call double* @ptr_scc_r2(double* %r, double* %a, double* %call)
ret double* %call1
}
define double* @ptr_scc_r2(double* %a, double* %b, double* %r) #0 {
entry:
%cmp = icmp ugt double* %a, %b
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%call = call double* @ptr_sink_r0(double* %r)
%call1 = call double* @ptr_scc_r2(double* %b, double* %a, double* %call)
br label %return
if.end: ; preds = %entry
%cmp2 = icmp ult double* %a, %b
br i1 %cmp2, label %if.then3, label %if.end12
if.then3: ; preds = %if.end
%call4 = call double* @ptr_sink_r0(double* %b)
%call5 = call double* @ptr_scc_r1(double* %a, double* %b, double* %r)
%call6 = call double* @ptr_scc_r2(double* %r, double* %r, double* %r)
%call7 = call double* @ptr_scc_r1(double* %a, double* %call6, double* %r)
%call8 = call double* @ptr_scc_r2(double* %a, double* %b, double* %r)
%call9 = call double* @ptr_scc_r2(double* %call5, double* %call7, double* %call8)
%call10 = call double* @ptr_scc_r1(double* %a, double* %b, double* %r)
%call11 = call double* @ptr_scc_r1(double* %call4, double* %call9, double* %call10)
br label %return
if.end12: ; preds = %if.end
%cmp13 = icmp eq double* %a, %b
br i1 %cmp13, label %cond.true, label %cond.false
cond.true: ; preds = %if.end12
br label %cond.end
cond.false: ; preds = %if.end12
%call14 = call double* @ptr_scc_r2(double* %a, double* %b, double* %r)
br label %cond.end
cond.end: ; preds = %cond.false, %cond.true
%cond = phi double* [ %r, %cond.true ], [ %call14, %cond.false ]
br label %return
return: ; preds = %cond.end, %if.then3, %if.then
%retval.0 = phi double* [ %call1, %if.then ], [ %call11, %if.then3 ], [ %cond, %cond.end ]
ret double* %retval.0
}
; TEST a no-return singleton SCC
;
; int* rt0(int *a) {
; return *a ? a : rt0(a);
; }
;
; FNATTR: define i32* @rt0(i32* readonly %a)
define i32* @rt0(i32* %a) #0 {
entry:
%v = load i32, i32* %a, align 4
%tobool = icmp ne i32 %v, 0
%call = call i32* @rt0(i32* %a)
%sel = select i1 %tobool, i32* %a, i32* %call
ret i32* %sel
}
; TEST a no-return singleton SCC
;
; int* rt1(int *a) {
; return *a ? undef : rt1(a);
; }
;
; FNATTR: define noalias i32* @rt1(i32* nocapture readonly %a)
define i32* @rt1(i32* %a) #0 {
entry:
%v = load i32, i32* %a, align 4
%tobool = icmp ne i32 %v, 0
%call = call i32* @rt1(i32* %a)
%sel = select i1 %tobool, i32* undef, i32* %call
ret i32* %sel
}
; TEST another SCC test
;
; FNATTR: define i32* @rt2_helper(i32* %a)
; FNATTR: define i32* @rt2(i32* readnone %a, i32* readnone %b)
define i32* @rt2_helper(i32* %a) #0 {
entry:
%call = call i32* @rt2(i32* %a, i32* %a)
ret i32* %call
}
define i32* @rt2(i32* %a, i32 *%b) #0 {
entry:
%cmp = icmp eq i32* %a, null
br i1 %cmp, label %if.then, label %if.end
if.then:
%call = call i32* @rt2_helper(i32* %a)
br label %if.end
if.end:
%sel = phi i32* [ %b, %entry], [%call, %if.then]
ret i32* %sel
}
; TEST another SCC test
;
; FNATTR: define i32* @rt3_helper(i32* %a, i32* %b)
; FNATTR: define i32* @rt3(i32* readnone %a, i32* readnone %b)
define i32* @rt3_helper(i32* %a, i32* %b) #0 {
entry:
%call = call i32* @rt3(i32* %a, i32* %b)
ret i32* %call
}
define i32* @rt3(i32* %a, i32 *%b) #0 {
entry:
%cmp = icmp eq i32* %a, null
br i1 %cmp, label %if.then, label %if.end
if.then:
%call = call i32* @rt3_helper(i32* %a, i32* %b)
br label %if.end
if.end:
%sel = phi i32* [ %b, %entry], [%call, %if.then]
ret i32* %sel
}
; TEST address taken function with call to an external functions
;
; void unknown_fn(void *);
;
; int* calls_unknown_fn(int *r) {
; unknown_fn(&calls_unknown_fn);
; return r;
; }
;
;
; FNATTR: define i32* @calls_unknown_fn(i32* readnone returned %r)
declare void @unknown_fn(i32* (i32*)*) #0
define i32* @calls_unknown_fn(i32* %r) #0 {
tail call void @unknown_fn(i32* (i32*)* nonnull @calls_unknown_fn)
ret i32* %r
}
; TEST return call to a function that might be redifined at link time
;
; int *maybe_redefined_fn2(int *r) {
; return r;
; }
;
; int *calls_maybe_redefined_fn2(int *r) {
; return maybe_redefined_fn2(r);
; }
;
; Verify the maybe-redefined function is not annotated:
;
;
; FNATTR: define i32* @calls_maybe_redefined_fn2(i32* %r)
define linkonce_odr i32* @maybe_redefined_fn2(i32* %r) #0 {
entry:
ret i32* %r
}
define i32* @calls_maybe_redefined_fn2(i32* %r) #0 {
entry:
%call = call i32* @maybe_redefined_fn2(i32* %r)
ret i32* %call
}
; TEST returned argument goes through select and phi
;
; double select_and_phi(double b) {
; double x = b;
; if (b > 0)
; x = b;
; return b == 0? b : x;
; }
;
;
; FNATTR: define double @select_and_phi(double %b)
define double @select_and_phi(double %b) #0 {
entry:
%cmp = fcmp ogt double %b, 0.000000e+00
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
br label %if.end
if.end: ; preds = %if.then, %entry
%phi = phi double [ %b, %if.then ], [ %b, %entry ]
%cmp1 = fcmp oeq double %b, 0.000000e+00
%sel = select i1 %cmp1, double %b, double %phi
ret double %sel
}
; TEST returned argument goes through recursion, select, and phi
;
; double recursion_select_and_phi(int a, double b) {
; double x = b;
; if (a-- > 0)
; x = recursion_select_and_phi(a, b);
; return b == 0? b : x;
; }
;
;
; FNATTR: define double @recursion_select_and_phi(i32 %a, double %b)
;
define double @recursion_select_and_phi(i32 %a, double %b) #0 {
entry:
%dec = add nsw i32 %a, -1
%cmp = icmp sgt i32 %a, 0
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%call = call double @recursion_select_and_phi(i32 %dec, double %b)
br label %if.end
if.end: ; preds = %if.then, %entry
%phi = phi double [ %call, %if.then ], [ %b, %entry ]
%cmp1 = fcmp oeq double %b, 0.000000e+00
%sel = select i1 %cmp1, double %b, double %phi
ret double %sel
}
; TEST returned argument goes through bitcasts
;
; double* bitcast(int* b) {
; return (double*)b;
; }
;
;
; FNATTR: define double* @bitcast(i32* readnone %b)
;
define double* @bitcast(i32* %b) #0 {
entry:
%bc0 = bitcast i32* %b to double*
ret double* %bc0
}
; TEST returned argument goes through select and phi interleaved with bitcasts
;
; double* bitcasts_select_and_phi(int* b) {
; double* x = b;
; if (b == 0)
; x = b;
; return b != 0 ? b : x;
; }
;
;
; FNATTR: define double* @bitcasts_select_and_phi(i32* readnone %b)
;
define double* @bitcasts_select_and_phi(i32* %b) #0 {
entry:
%bc0 = bitcast i32* %b to double*
%cmp = icmp eq double* %bc0, null
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%bc1 = bitcast i32* %b to double*
br label %if.end
if.end: ; preds = %if.then, %entry
%phi = phi double* [ %bc1, %if.then ], [ %bc0, %entry ]
%bc2 = bitcast double* %phi to i8*
%bc3 = bitcast i32* %b to i8*
%cmp2 = icmp ne double* %bc0, null
%sel = select i1 %cmp2, i8* %bc2, i8* %bc3
%bc4 = bitcast i8* %sel to double*
ret double* %bc4
}
; TEST return argument or argument or undef
;
; double* ret_arg_arg_undef(int* b) {
; if (b == 0)
; return (double*)b;
; if (b == 0)
; return (double*)b;
; /* return undef */
; }
;
;
; FNATTR: define double* @ret_arg_arg_undef(i32* readnone %b)
;
define double* @ret_arg_arg_undef(i32* %b) #0 {
entry:
%bc0 = bitcast i32* %b to double*
%cmp = icmp eq double* %bc0, null
br i1 %cmp, label %ret_arg0, label %if.end
ret_arg0:
%bc1 = bitcast i32* %b to double*
ret double* %bc1
if.end:
br i1 %cmp, label %ret_arg1, label %ret_undef
ret_arg1:
ret double* %bc0
ret_undef:
ret double *undef
}
; TEST return undef or argument or argument
;
; double* ret_undef_arg_arg(int* b) {
; if (b == 0)
; return (double*)b;
; if (b == 0)
; return (double*)b;
; /* return undef */
; }
;
;
; FNATTR: define double* @ret_undef_arg_arg(i32* readnone %b)
;
define double* @ret_undef_arg_arg(i32* %b) #0 {
entry:
%bc0 = bitcast i32* %b to double*
%cmp = icmp eq double* %bc0, null
br i1 %cmp, label %ret_undef, label %if.end
ret_undef:
ret double *undef
if.end:
br i1 %cmp, label %ret_arg0, label %ret_arg1
ret_arg0:
ret double* %bc0
ret_arg1:
%bc1 = bitcast i32* %b to double*
ret double* %bc1
}
; TEST return undef or argument or undef
;
; double* ret_undef_arg_undef(int* b) {
; if (b == 0)
; /* return undef */
; if (b == 0)
; return (double*)b;
; /* return undef */
; }
;
;
; FNATTR: define double* @ret_undef_arg_undef(i32* readnone %b)
define double* @ret_undef_arg_undef(i32* %b) #0 {
entry:
%bc0 = bitcast i32* %b to double*
%cmp = icmp eq double* %bc0, null
br i1 %cmp, label %ret_undef0, label %if.end
ret_undef0:
ret double *undef
if.end:
br i1 %cmp, label %ret_arg, label %ret_undef1
ret_arg:
ret double* %bc0
ret_undef1:
ret double *undef
}
; TEST return argument or unknown call result
;
; int* ret_arg_or_unknown(int* b) {
; if (b == 0)
; return b;
; return unknown();
; }
;
; Verify we do not assume b is returned
;
; FNATTR: define i32* @ret_arg_or_unknown(i32* %b)
; FNATTR: define i32* @ret_arg_or_unknown_through_phi(i32* %b)
declare i32* @unknown(i32*)
define i32* @ret_arg_or_unknown(i32* %b) #0 {
entry:
%cmp = icmp eq i32* %b, null
br i1 %cmp, label %ret_arg, label %ret_unknown
ret_arg:
ret i32* %b
ret_unknown:
%call = call i32* @unknown(i32* %b)
ret i32* %call
}
define i32* @ret_arg_or_unknown_through_phi(i32* %b) #0 {
entry:
%cmp = icmp eq i32* %b, null
br i1 %cmp, label %ret_arg, label %ret_unknown
ret_arg:
br label %r
ret_unknown:
%call = call i32* @unknown(i32* %b)
br label %r
r:
%phi = phi i32* [ %b, %ret_arg ], [ %call, %ret_unknown ]
ret i32* %phi
}
; TEST inconsistent IR in dead code.
;
; FNATTR: define i32 @deadblockcall1(i32 %A)
; FNATTR: define i32 @deadblockcall2(i32 %A)
; FNATTR: define i32 @deadblockphi1(i32 %A)
; FNATTR: define i32 @deadblockphi2(i32 %A)
define i32 @deadblockcall1(i32 %A) #0 {
entry:
ret i32 %A
unreachableblock:
%B = call i32 @deadblockcall1(i32 %B)
ret i32 %B
}
declare i32 @deadblockcall_helper(i32 returned %A);
define i32 @deadblockcall2(i32 %A) #0 {
entry:
ret i32 %A
unreachableblock1:
%B = call i32 @deadblockcall_helper(i32 %B)
ret i32 %B
unreachableblock2:
%C = call i32 @deadblockcall1(i32 %C)
ret i32 %C
}
define i32 @deadblockphi1(i32 %A) #0 {
entry:
br label %r
unreachableblock1:
%B = call i32 @deadblockcall_helper(i32 %B)
ret i32 %B
unreachableblock2:
%C = call i32 @deadblockcall1(i32 %C)
br label %r
r:
%PHI = phi i32 [%A, %entry], [%C, %unreachableblock2]
ret i32 %PHI
}
define i32 @deadblockphi2(i32 %A) #0 {
entry:
br label %r
unreachableblock1:
%B = call i32 @deadblockcall_helper(i32 %B)
br label %unreachableblock3
unreachableblock2:
%C = call i32 @deadblockcall1(i32 %C)
br label %unreachableblock3
unreachableblock3:
%PHI1 = phi i32 [%B, %unreachableblock1], [%C, %unreachableblock2]
br label %r
r:
%PHI2 = phi i32 [%A, %entry], [%PHI1, %unreachableblock3]
ret i32 %PHI2
}
declare void @noreturn() noreturn;
define i32 @deadblockphi3(i32 %A, i1 %c) #0 {
entry:
br i1 %c, label %r, label %unreachablecall
unreachablecall:
call void @noreturn();
%B = call i32 @deadblockcall_helper(i32 0)
br label %unreachableblock3
unreachableblock2:
%C = call i32 @deadblockcall1(i32 %C)
br label %unreachableblock3
unreachableblock3:
%PHI1 = phi i32 [%B, %unreachablecall], [%C, %unreachableblock2]
br label %r
r:
%PHI2 = phi i32 [%A, %entry], [%PHI1, %unreachableblock3]
ret i32 %PHI2
}
attributes #0 = { noinline nounwind uwtable }