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clang-p2996/llvm/test/Transforms/Attributor/potential.ll
Nikita Popov e44b11d9b6 [ValueTracking] Treat branch on undef as UB as well 
We were already treating branch on poison as UB, but branch on
undef is also UB. Move the checks into the correct function.

From LangRef for br:

> If ‘cond’ is poison or undef, this instruction has undefined behavior.

From LangRef for switch:

> If ‘value’ is poison or undef, this instruction has undefined behavior.

There is a minor regression in dont-distribute-phi.ll, apparently
we handle that pattern in logical but not bitwise form.
2023-01-02 12:34:23 +01:00

705 lines
26 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes --check-globals
; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=13 -S < %s | FileCheck %s --check-prefixes=CHECK,TUNIT
; RUN: opt -aa-pipeline=basic-aa -passes=attributor-cgscc -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,CGSCC
;
; Test for multiple potential values
;
; potential-test 1
; bool iszero(int c) { return c == 0; }
; bool potential_test1(bool c) { return iszero(c ? 1 : -1); }
define internal i1 @iszero1(i32 %c) {
; CGSCC: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@iszero1
; CGSCC-SAME: (i32 noundef [[C:%.*]]) #[[ATTR0:[0-9]+]] {
; CGSCC-NEXT: [[CMP:%.*]] = icmp eq i32 [[C]], 0
; CGSCC-NEXT: ret i1 [[CMP]]
;
%cmp = icmp eq i32 %c, 0
ret i1 %cmp
}
define i1 @potential_test1(i1 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test1
; TUNIT-SAME: (i1 [[C:%.*]]) #[[ATTR0:[0-9]+]] {
; TUNIT-NEXT: ret i1 false
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test1
; CGSCC-SAME: (i1 [[C:%.*]]) #[[ATTR1:[0-9]+]] {
; CGSCC-NEXT: [[ARG:%.*]] = select i1 [[C]], i32 -1, i32 1
; CGSCC-NEXT: [[RET:%.*]] = call i1 @iszero1(i32 noundef [[ARG]]) #[[ATTR2:[0-9]+]]
; CGSCC-NEXT: ret i1 [[RET]]
;
%arg = select i1 %c, i32 -1, i32 1
%ret = call i1 @iszero1(i32 %arg)
ret i1 %ret
}
; potential-test 2
;
; potential values of argument of iszero are {1,-1}
; potential value of returned value of iszero is 0
;
; int call_with_two_values(int x) { return iszero(x) + iszero(-x); }
; int potential_test2(int x) { return call_with_two_values(1) + call_with_two_values(-1); }
define internal i32 @iszero2(i32 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@iszero2
; CHECK-SAME: (i32 [[C:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[C]], 0
; CHECK-NEXT: [[RET:%.*]] = zext i1 [[CMP]] to i32
; CHECK-NEXT: ret i32 [[RET]]
;
%cmp = icmp eq i32 %c, 0
%ret = zext i1 %cmp to i32
ret i32 %ret
}
define internal i32 @call_with_two_values(i32 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@call_with_two_values
; TUNIT-SAME: (i32 noundef [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: [[CSRET1:%.*]] = call i32 @iszero2(i32 noundef [[C]]) #[[ATTR1:[0-9]+]], !range [[RNG0:![0-9]+]]
; TUNIT-NEXT: [[MINUSC:%.*]] = sub i32 0, [[C]]
; TUNIT-NEXT: [[CSRET2:%.*]] = call i32 @iszero2(i32 [[MINUSC]]) #[[ATTR1]], !range [[RNG0]]
; TUNIT-NEXT: [[RET:%.*]] = add i32 [[CSRET1]], [[CSRET2]]
; TUNIT-NEXT: ret i32 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@call_with_two_values
; CGSCC-SAME: (i32 noundef [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[CSRET1:%.*]] = call i32 @iszero2(i32 noundef [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[MINUSC:%.*]] = sub i32 0, [[C]]
; CGSCC-NEXT: [[CSRET2:%.*]] = call i32 @iszero2(i32 [[MINUSC]]) #[[ATTR2]]
; CGSCC-NEXT: [[RET:%.*]] = add i32 [[CSRET1]], [[CSRET2]]
; CGSCC-NEXT: ret i32 [[RET]]
;
%csret1 = call i32 @iszero2(i32 %c)
%minusc = sub i32 0, %c
%csret2 = call i32 @iszero2(i32 %minusc)
%ret = add i32 %csret1, %csret2
ret i32 %ret
}
define i32 @potential_test2(i1 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test2
; TUNIT-SAME: (i1 [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: [[CSRET1:%.*]] = call i32 @call_with_two_values(i32 noundef 1) #[[ATTR1]], !range [[RNG1:![0-9]+]]
; TUNIT-NEXT: [[CSRET2:%.*]] = call i32 @call_with_two_values(i32 noundef -1) #[[ATTR1]], !range [[RNG1]]
; TUNIT-NEXT: [[RET:%.*]] = add i32 [[CSRET1]], [[CSRET2]]
; TUNIT-NEXT: ret i32 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test2
; CGSCC-SAME: (i1 [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[CSRET1:%.*]] = call i32 @call_with_two_values(i32 noundef 1) #[[ATTR2]]
; CGSCC-NEXT: [[CSRET2:%.*]] = call i32 @call_with_two_values(i32 noundef -1) #[[ATTR2]]
; CGSCC-NEXT: [[RET:%.*]] = add i32 [[CSRET1]], [[CSRET2]]
; CGSCC-NEXT: ret i32 [[RET]]
;
%csret1 = call i32 @call_with_two_values(i32 1)
%csret2 = call i32 @call_with_two_values(i32 -1)
%ret = add i32 %csret1, %csret2
ret i32 %ret
}
; potential-test 3
;
; potential values of returned value of f are {0,1}
; potential values of argument of g are {0,1}
; potential value of returned value of g is 1
; then returned value of g can be simplified
;
; int zero_or_one(int c) { return c < 2; }
; int potential_test3() { return zero_or_one(iszero(0))+zero_or_one(iszero(1)); }
define internal i32 @iszero3(i32 %c) {
; CGSCC: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@iszero3
; CGSCC-SAME: (i32 noundef [[C:%.*]]) #[[ATTR0]] {
; CGSCC-NEXT: [[CMP:%.*]] = icmp eq i32 [[C]], 0
; CGSCC-NEXT: [[RET:%.*]] = zext i1 [[CMP]] to i32
; CGSCC-NEXT: ret i32 [[RET]]
;
%cmp = icmp eq i32 %c, 0
%ret = zext i1 %cmp to i32
ret i32 %ret
}
define internal i32 @less_than_two(i32 %c) {
; CGSCC: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@less_than_two
; CGSCC-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; CGSCC-NEXT: [[CMP:%.*]] = icmp slt i32 [[C]], 2
; CGSCC-NEXT: [[RET:%.*]] = zext i1 [[CMP]] to i32
; CGSCC-NEXT: ret i32 [[RET]]
;
%cmp = icmp slt i32 %c, 2
%ret = zext i1 %cmp to i32
ret i32 %ret
}
define i32 @potential_test3() {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test3
; TUNIT-SAME: () #[[ATTR0]] {
; TUNIT-NEXT: ret i32 2
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test3
; CGSCC-SAME: () #[[ATTR1]] {
; CGSCC-NEXT: [[CMP1:%.*]] = call i32 @iszero3(i32 noundef 0) #[[ATTR2]]
; CGSCC-NEXT: [[TRUE1:%.*]] = call i32 @less_than_two(i32 [[CMP1]]) #[[ATTR2]]
; CGSCC-NEXT: [[CMP2:%.*]] = call i32 @iszero3(i32 noundef 1) #[[ATTR2]]
; CGSCC-NEXT: [[TRUE2:%.*]] = call i32 @less_than_two(i32 [[CMP2]]) #[[ATTR2]]
; CGSCC-NEXT: [[RET:%.*]] = add i32 [[TRUE1]], [[TRUE2]]
; CGSCC-NEXT: ret i32 [[RET]]
;
%cmp1 = call i32 @iszero3(i32 0)
%true1 = call i32 @less_than_two(i32 %cmp1)
%cmp2 = call i32 @iszero3(i32 1)
%true2 = call i32 @less_than_two(i32 %cmp2)
%ret = add i32 %true1, %true2
ret i32 %ret
}
; potential-test 4,5
;
; simplified
; int potential_test4(int c) { return return1or3(c) == 2; }
; int potential_test5(int c) { return return1or3(c) == return2or4(c); }
;
; not simplified
; int potential_test6(int c) { return return1or3(c) == 3; }
; int potential_test7(int c) { return return1or3(c) == return3or4(c); }
define i32 @potential_test4(i32 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test4
; TUNIT-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: [[CSRET:%.*]] = call i32 @return1or3(i32 [[C]]) #[[ATTR1]]
; TUNIT-NEXT: [[FALSE:%.*]] = icmp eq i32 [[CSRET]], 2
; TUNIT-NEXT: [[RET:%.*]] = zext i1 [[FALSE]] to i32
; TUNIT-NEXT: ret i32 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test4
; CGSCC-SAME: (i32 [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[CSRET:%.*]] = call i32 @return1or3(i32 [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[FALSE:%.*]] = icmp eq i32 [[CSRET]], 2
; CGSCC-NEXT: [[RET:%.*]] = zext i1 [[FALSE]] to i32
; CGSCC-NEXT: ret i32 [[RET]]
;
%csret = call i32 @return1or3(i32 %c)
%false = icmp eq i32 %csret, 2
%ret = zext i1 %false to i32
ret i32 %ret
}
define i32 @potential_test5(i32 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test5
; TUNIT-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: [[CSRET1:%.*]] = call i32 @return1or3(i32 [[C]]) #[[ATTR1]]
; TUNIT-NEXT: [[CSRET2:%.*]] = call i32 @return2or4(i32 [[C]]) #[[ATTR1]]
; TUNIT-NEXT: [[FALSE:%.*]] = icmp eq i32 [[CSRET1]], [[CSRET2]]
; TUNIT-NEXT: [[RET:%.*]] = zext i1 [[FALSE]] to i32
; TUNIT-NEXT: ret i32 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test5
; CGSCC-SAME: (i32 [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[CSRET1:%.*]] = call i32 @return1or3(i32 [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[CSRET2:%.*]] = call i32 @return2or4(i32 [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[FALSE:%.*]] = icmp eq i32 [[CSRET1]], [[CSRET2]]
; CGSCC-NEXT: [[RET:%.*]] = zext i1 [[FALSE]] to i32
; CGSCC-NEXT: ret i32 [[RET]]
;
%csret1 = call i32 @return1or3(i32 %c)
%csret2 = call i32 @return2or4(i32 %c)
%false = icmp eq i32 %csret1, %csret2
%ret = zext i1 %false to i32
ret i32 %ret
}
define i1 @potential_test6(i32 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test6
; TUNIT-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: [[CSRET1:%.*]] = call i32 @return1or3(i32 [[C]]) #[[ATTR1]]
; TUNIT-NEXT: [[RET:%.*]] = icmp eq i32 [[CSRET1]], 3
; TUNIT-NEXT: ret i1 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test6
; CGSCC-SAME: (i32 [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[CSRET1:%.*]] = call i32 @return1or3(i32 [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[RET:%.*]] = icmp eq i32 [[CSRET1]], 3
; CGSCC-NEXT: ret i1 [[RET]]
;
%csret1 = call i32 @return1or3(i32 %c)
%ret = icmp eq i32 %csret1, 3
ret i1 %ret
}
define i1 @potential_test7(i32 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test7
; TUNIT-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: [[CSRET1:%.*]] = call i32 @return1or3(i32 [[C]]) #[[ATTR1]]
; TUNIT-NEXT: [[CSRET2:%.*]] = call i32 @return3or4(i32 [[C]]) #[[ATTR1]]
; TUNIT-NEXT: [[RET:%.*]] = icmp eq i32 [[CSRET1]], [[CSRET2]]
; TUNIT-NEXT: ret i1 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test7
; CGSCC-SAME: (i32 [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[CSRET1:%.*]] = call i32 @return1or3(i32 [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[CSRET2:%.*]] = call i32 @return3or4(i32 [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[RET:%.*]] = icmp eq i32 [[CSRET1]], [[CSRET2]]
; CGSCC-NEXT: ret i1 [[RET]]
;
%csret1 = call i32 @return1or3(i32 %c)
%csret2 = call i32 @return3or4(i32 %c)
%ret = icmp eq i32 %csret1, %csret2
ret i1 %ret
}
define internal i32 @return1or3(i32 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@return1or3
; CHECK-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[C]], 0
; CHECK-NEXT: [[RET:%.*]] = select i1 [[CMP]], i32 1, i32 3
; CHECK-NEXT: ret i32 [[RET]]
;
%cmp = icmp eq i32 %c, 0
%ret = select i1 %cmp, i32 1, i32 3
ret i32 %ret
}
define internal i32 @return2or4(i32 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@return2or4
; CHECK-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[C]], 0
; CHECK-NEXT: [[RET:%.*]] = select i1 [[CMP]], i32 2, i32 4
; CHECK-NEXT: ret i32 [[RET]]
;
%cmp = icmp eq i32 %c, 0
%ret = select i1 %cmp, i32 2, i32 4
ret i32 %ret
}
define internal i32 @return3or4(i32 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@return3or4
; CHECK-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[C]], 0
; CHECK-NEXT: [[RET:%.*]] = select i1 [[CMP]], i32 3, i32 4
; CHECK-NEXT: ret i32 [[RET]]
;
%cmp = icmp eq i32 %c, 0
%ret = select i1 %cmp, i32 3, i32 4
ret i32 %ret
}
; potential-test 8
;
; propagate argument to callsite argument
define internal i1 @cmp_with_four(i32 %c) {
; CGSCC: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@cmp_with_four
; CGSCC-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; CGSCC-NEXT: [[CMP:%.*]] = icmp eq i32 [[C]], 4
; CGSCC-NEXT: ret i1 [[CMP]]
;
%cmp = icmp eq i32 %c, 4
ret i1 %cmp
}
define internal i1 @wrapper(i32 %c) {
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@wrapper
; CGSCC-SAME: (i32 noundef [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[RET:%.*]] = call i1 @cmp_with_four(i32 noundef [[C]]) #[[ATTR2]]
; CGSCC-NEXT: ret i1 [[RET]]
;
%ret = call i1 @cmp_with_four(i32 %c)
ret i1 %ret
}
define i1 @potential_test8() {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test8
; TUNIT-SAME: () #[[ATTR0]] {
; TUNIT-NEXT: ret i1 false
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test8
; CGSCC-SAME: () #[[ATTR1]] {
; CGSCC-NEXT: [[RES1:%.*]] = call i1 @wrapper(i32 noundef 1) #[[ATTR2]]
; CGSCC-NEXT: [[RES3:%.*]] = call i1 @wrapper(i32 noundef 3) #[[ATTR2]]
; CGSCC-NEXT: [[RES5:%.*]] = call i1 @wrapper(i32 noundef 5) #[[ATTR2]]
; CGSCC-NEXT: [[RES13:%.*]] = or i1 [[RES1]], [[RES3]]
; CGSCC-NEXT: [[RES135:%.*]] = or i1 [[RES13]], [[RES5]]
; CGSCC-NEXT: ret i1 [[RES135]]
;
%res1 = call i1 @wrapper(i32 1)
%res3 = call i1 @wrapper(i32 3)
%res5 = call i1 @wrapper(i32 5)
%res13 = or i1 %res1, %res3
%res135 = or i1 %res13, %res5
ret i1 %res135
}
define i1 @potential_test9() {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@potential_test9
; CHECK-SAME: () #[[ATTR0]] {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[COND:%.*]]
; CHECK: cond:
; CHECK-NEXT: [[I_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_1:%.*]], [[INC:%.*]] ]
; CHECK-NEXT: [[C_0:%.*]] = phi i32 [ 1, [[ENTRY]] ], [ [[C_1:%.*]], [[INC]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I_0]], 10
; CHECK-NEXT: br i1 [[CMP]], label [[BODY:%.*]], label [[END:%.*]]
; CHECK: body:
; CHECK-NEXT: [[C_1]] = mul i32 [[C_0]], -1
; CHECK-NEXT: br label [[INC]]
; CHECK: inc:
; CHECK-NEXT: [[I_1]] = add i32 [[I_0]], 1
; CHECK-NEXT: br label [[COND]]
; CHECK: end:
; CHECK-NEXT: [[RET:%.*]] = icmp eq i32 [[C_0]], 0
; CHECK-NEXT: ret i1 [[RET]]
;
entry:
br label %cond
cond:
%i.0 = phi i32 [0, %entry], [%i.1, %inc]
%c.0 = phi i32 [1, %entry], [%c.1, %inc]
%cmp = icmp slt i32 %i.0, 10
br i1 %cmp, label %body, label %end
body:
%c.1 = mul i32 %c.0, -1
br label %inc
inc:
%i.1 = add i32 %i.0, 1
br label %cond
end:
%ret = icmp eq i32 %c.0, 0
ret i1 %ret
}
; Test 10
; FIXME: potential returned values of @may_return_undef is {1, -1}
; and returned value of @potential_test10 can be simplified to 0(false)
define internal i32 @may_return_undef(i32 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@may_return_undef
; CHECK-SAME: (i32 noundef [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: switch i32 [[C]], label [[OTHERWISE:%.*]] [
; CHECK-NEXT: i32 1, label [[A:%.*]]
; CHECK-NEXT: i32 -1, label [[B:%.*]]
; CHECK-NEXT: ]
; CHECK: a:
; CHECK-NEXT: ret i32 1
; CHECK: b:
; CHECK-NEXT: ret i32 -1
; CHECK: otherwise:
; CHECK-NEXT: ret i32 undef
;
switch i32 %c, label %otherwise [i32 1, label %a
i32 -1, label %b]
a:
ret i32 1
b:
ret i32 -1
otherwise:
ret i32 undef
}
define i1 @potential_test10(i32 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test10
; TUNIT-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: [[RET:%.*]] = call i32 @may_return_undef(i32 [[C]]) #[[ATTR1]]
; TUNIT-NEXT: [[CMP:%.*]] = icmp eq i32 [[RET]], 0
; TUNIT-NEXT: ret i1 [[CMP]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test10
; CGSCC-SAME: (i32 noundef [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[RET:%.*]] = call i32 @may_return_undef(i32 noundef [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[CMP:%.*]] = icmp eq i32 [[RET]], 0
; CGSCC-NEXT: ret i1 [[CMP]]
;
%ret = call i32 @may_return_undef(i32 %c)
%cmp = icmp eq i32 %ret, 0
ret i1 %cmp
}
define i32 @optimize_undef_1(i1 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@optimize_undef_1
; CHECK-SAME: (i1 noundef [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: br i1 [[C]], label [[T:%.*]], label [[F:%.*]]
; CHECK: t:
; CHECK-NEXT: ret i32 0
; CHECK: f:
; CHECK-NEXT: [[UNDEF:%.*]] = add i32 undef, 1
; CHECK-NEXT: ret i32 [[UNDEF]]
;
br i1 %c, label %t, label %f
t:
ret i32 0
f:
%undef = add i32 undef, 1
ret i32 %undef
}
define i32 @optimize_undef_2(i1 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@optimize_undef_2
; CHECK-SAME: (i1 noundef [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: br i1 [[C]], label [[T:%.*]], label [[F:%.*]]
; CHECK: t:
; CHECK-NEXT: ret i32 0
; CHECK: f:
; CHECK-NEXT: [[UNDEF:%.*]] = sub i32 undef, 1
; CHECK-NEXT: ret i32 [[UNDEF]]
;
br i1 %c, label %t, label %f
t:
ret i32 0
f:
%undef = sub i32 undef, 1
ret i32 %undef
}
define i32 @optimize_undef_3(i1 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@optimize_undef_3
; CHECK-SAME: (i1 noundef [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: br i1 [[C]], label [[T:%.*]], label [[F:%.*]]
; CHECK: t:
; CHECK-NEXT: ret i32 0
; CHECK: f:
; CHECK-NEXT: [[UNDEF:%.*]] = icmp eq i32 undef, 0
; CHECK-NEXT: [[UNDEF2:%.*]] = zext i1 [[UNDEF]] to i32
; CHECK-NEXT: ret i32 [[UNDEF2]]
;
br i1 %c, label %t, label %f
t:
ret i32 0
f:
%undef = icmp eq i32 undef, 0
%undef2 = zext i1 %undef to i32
ret i32 %undef2
}
; FIXME: returned value can be simplified to 0
define i32 @potential_test11(i1 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test11
; TUNIT-SAME: (i1 [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: [[ZERO1:%.*]] = call i32 @optimize_undef_1(i1 [[C]]) #[[ATTR1]], !range [[RNG0]]
; TUNIT-NEXT: [[ZERO2:%.*]] = call i32 @optimize_undef_2(i1 [[C]]) #[[ATTR1]], !range [[RNG2:![0-9]+]]
; TUNIT-NEXT: [[ZERO3:%.*]] = call i32 @optimize_undef_3(i1 [[C]]) #[[ATTR1]], !range [[RNG0]]
; TUNIT-NEXT: [[ACC1:%.*]] = add i32 [[ZERO1]], [[ZERO2]]
; TUNIT-NEXT: [[ACC2:%.*]] = add i32 [[ACC1]], [[ZERO3]]
; TUNIT-NEXT: ret i32 [[ACC2]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test11
; CGSCC-SAME: (i1 noundef [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[ZERO1:%.*]] = call i32 @optimize_undef_1(i1 noundef [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[ZERO2:%.*]] = call i32 @optimize_undef_2(i1 noundef [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[ZERO3:%.*]] = call i32 @optimize_undef_3(i1 noundef [[C]]) #[[ATTR2]]
; CGSCC-NEXT: [[ACC1:%.*]] = add i32 [[ZERO1]], [[ZERO2]]
; CGSCC-NEXT: [[ACC2:%.*]] = add i32 [[ACC1]], [[ZERO3]]
; CGSCC-NEXT: ret i32 [[ACC2]]
;
%zero1 = call i32 @optimize_undef_1(i1 %c)
%zero2 = call i32 @optimize_undef_2(i1 %c)
%zero3 = call i32 @optimize_undef_3(i1 %c)
%acc1 = add i32 %zero1, %zero2
%acc2 = add i32 %acc1, %zero3
ret i32 %acc2
}
define i32 @optimize_poison_1(i1 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@optimize_poison_1
; CHECK-SAME: (i1 noundef [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: br i1 [[C]], label [[T:%.*]], label [[F:%.*]]
; CHECK: t:
; CHECK-NEXT: ret i32 0
; CHECK: f:
; CHECK-NEXT: [[POISON:%.*]] = sub nuw i32 0, 1
; CHECK-NEXT: ret i32 [[POISON]]
;
br i1 %c, label %t, label %f
t:
ret i32 0
f:
%poison = sub nuw i32 0, 1
ret i32 %poison
}
; FIXME: returned value can be simplified to 0
define i32 @potential_test12(i1 %c) {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test12
; TUNIT-SAME: (i1 [[C:%.*]]) #[[ATTR0]] {
; TUNIT-NEXT: ret i32 0
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test12
; CGSCC-SAME: (i1 noundef [[C:%.*]]) #[[ATTR1]] {
; CGSCC-NEXT: [[ZERO:%.*]] = call i32 @optimize_poison_1(i1 noundef [[C]]) #[[ATTR2]]
; CGSCC-NEXT: ret i32 [[ZERO]]
;
%zero = call i32 @optimize_poison_1(i1 %c)
ret i32 %zero
}
; Test 13
; Do not simplify %ret in the callee to `%c`.
; The potential value of %c is {0, 1} (undef is merged).
; However, we should not simplify `and i32 %c, 3` to `%c`
define internal i32 @potential_test13_callee(i32 %c) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@potential_test13_callee
; CHECK-SAME: (i32 [[C:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[RET:%.*]] = and i32 [[C]], 3
; CHECK-NEXT: ret i32 [[RET]]
;
%ret = and i32 %c, 3
ret i32 %ret
}
define i32 @potential_test13_caller1() {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test13_caller1
; TUNIT-SAME: () #[[ATTR0]] {
; TUNIT-NEXT: [[RET:%.*]] = call i32 @potential_test13_callee(i32 noundef 0) #[[ATTR1]], !range [[RNG0]]
; TUNIT-NEXT: ret i32 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test13_caller1
; CGSCC-SAME: () #[[ATTR1]] {
; CGSCC-NEXT: [[RET:%.*]] = call i32 @potential_test13_callee(i32 noundef 0) #[[ATTR2]]
; CGSCC-NEXT: ret i32 [[RET]]
;
%ret = call i32 @potential_test13_callee(i32 0)
ret i32 %ret
}
define i32 @potential_test13_caller2() {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test13_caller2
; TUNIT-SAME: () #[[ATTR0]] {
; TUNIT-NEXT: [[RET:%.*]] = call i32 @potential_test13_callee(i32 noundef 1) #[[ATTR1]], !range [[RNG0]]
; TUNIT-NEXT: ret i32 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test13_caller2
; CGSCC-SAME: () #[[ATTR1]] {
; CGSCC-NEXT: [[RET:%.*]] = call i32 @potential_test13_callee(i32 noundef 1) #[[ATTR2]]
; CGSCC-NEXT: ret i32 [[RET]]
;
%ret = call i32 @potential_test13_callee(i32 1)
ret i32 %ret
}
define i32 @potential_test13_caller3() {
; TUNIT: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; TUNIT-LABEL: define {{[^@]+}}@potential_test13_caller3
; TUNIT-SAME: () #[[ATTR0]] {
; TUNIT-NEXT: [[RET:%.*]] = call i32 @potential_test13_callee(i32 undef) #[[ATTR1]], !range [[RNG0]]
; TUNIT-NEXT: ret i32 [[RET]]
;
; CGSCC: Function Attrs: nofree nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@potential_test13_caller3
; CGSCC-SAME: () #[[ATTR1]] {
; CGSCC-NEXT: [[RET:%.*]] = call i32 @potential_test13_callee(i32 undef) #[[ATTR2]]
; CGSCC-NEXT: ret i32 [[RET]]
;
%ret = call i32 @potential_test13_callee(i32 undef)
ret i32 %ret
}
define i1 @potential_test14(i1 %c0, i1 %c1, i1 %c2, i1 %c3) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@potential_test14
; CHECK-SAME: (i1 [[C0:%.*]], i1 [[C1:%.*]], i1 [[C2:%.*]], i1 [[C3:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[X0:%.*]] = select i1 [[C0]], i32 0, i32 1
; CHECK-NEXT: [[X1:%.*]] = select i1 [[C1]], i32 [[X0]], i32 undef
; CHECK-NEXT: [[Y2:%.*]] = select i1 [[C2]], i32 0, i32 7
; CHECK-NEXT: [[Z3:%.*]] = select i1 [[C3]], i32 [[X1]], i32 [[Y2]]
; CHECK-NEXT: [[RET:%.*]] = icmp slt i32 [[Z3]], 7
; CHECK-NEXT: ret i1 [[RET]]
;
%x0 = select i1 %c0, i32 0, i32 1
%x1 = select i1 %c1, i32 %x0, i32 undef
%y2 = select i1 %c2, i32 0, i32 7
%z3 = select i1 %c3, i32 %x1, i32 %y2
%ret = icmp slt i32 %z3, 7
ret i1 %ret
}
define i1 @potential_test15(i1 %c0, i1 %c1) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@potential_test15
; CHECK-SAME: (i1 [[C0:%.*]], i1 [[C1:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[X0:%.*]] = select i1 [[C0]], i32 0, i32 1
; CHECK-NEXT: [[X1:%.*]] = select i1 [[C1]], i32 [[X0]], i32 undef
; CHECK-NEXT: [[RET:%.*]] = icmp eq i32 [[X1]], 7
; CHECK-NEXT: ret i1 [[RET]]
;
%x0 = select i1 %c0, i32 0, i32 1
%x1 = select i1 %c1, i32 %x0, i32 undef
%ret = icmp eq i32 %x1, 7
ret i1 %ret
}
define i1 @potential_test16(i1 %c0, i1 %c1) {
; CHECK: Function Attrs: nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@potential_test16
; CHECK-SAME: (i1 [[C0:%.*]], i1 [[C1:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[X1:%.*]] = select i1 [[C1]], i32 0, i32 1
; CHECK-NEXT: [[RET:%.*]] = icmp eq i32 [[X1]], 7
; CHECK-NEXT: ret i1 [[RET]]
;
%x0 = select i1 %c0, i32 0, i32 undef
%x1 = select i1 %c1, i32 %x0, i32 1
%ret = icmp eq i32 %x1, 7
ret i1 %ret
}
;.
; TUNIT: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind willreturn memory(none) }
; TUNIT: attributes #[[ATTR1]] = { nofree nosync nounwind willreturn }
;.
; CGSCC: attributes #[[ATTR0]] = { nofree norecurse nosync nounwind willreturn memory(none) }
; CGSCC: attributes #[[ATTR1]] = { nofree nosync nounwind willreturn memory(none) }
; CGSCC: attributes #[[ATTR2]] = { willreturn }
;.
; TUNIT: [[RNG0]] = !{i32 0, i32 2}
; TUNIT: [[RNG1]] = !{i32 0, i32 3}
; TUNIT: [[RNG2]] = !{i32 -1, i32 1}
;.
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