214 lines
3.4 KiB
C
214 lines
3.4 KiB
C
// RUN: %clang_cc1 -triple i386-unknown-unknown -O3 %s -emit-llvm -o - | FileCheck %s
|
|
|
|
int foo(int i) {
|
|
int j = 0;
|
|
switch (i) {
|
|
case -1:
|
|
j = 1; break;
|
|
case 1 :
|
|
j = 2; break;
|
|
case 2:
|
|
j = 3; break;
|
|
default:
|
|
j = 42; break;
|
|
}
|
|
j = j + 1;
|
|
return j;
|
|
}
|
|
|
|
int foo2(int i) {
|
|
int j = 0;
|
|
switch (i) {
|
|
case 1 :
|
|
j = 2; break;
|
|
case 2 ... 10:
|
|
j = 3; break;
|
|
default:
|
|
j = 42; break;
|
|
}
|
|
j = j + 1;
|
|
return j;
|
|
}
|
|
|
|
int foo3(int i) {
|
|
int j = 0;
|
|
switch (i) {
|
|
default:
|
|
j = 42; break;
|
|
case 111:
|
|
j = 111; break;
|
|
case 0 ... 100:
|
|
j = 1; break;
|
|
case 222:
|
|
j = 222; break;
|
|
}
|
|
return j;
|
|
}
|
|
|
|
|
|
static int foo4(int i) {
|
|
int j = 0;
|
|
switch (i) {
|
|
case 111:
|
|
j = 111; break;
|
|
case 0 ... 100:
|
|
j = 1; break;
|
|
case 222:
|
|
j = 222; break;
|
|
default:
|
|
j = 42; break;
|
|
case 501 ... 600:
|
|
j = 5; break;
|
|
}
|
|
return j;
|
|
}
|
|
|
|
// CHECK-LABEL: define{{.*}} i32 @foo4t()
|
|
// CHECK: ret i32 376
|
|
// CHECK: }
|
|
int foo4t() {
|
|
// 111 + 1 + 222 + 42 = 376
|
|
return foo4(111) + foo4(99) + foo4(222) + foo4(601);
|
|
}
|
|
|
|
// CHECK-LABEL: define{{.*}} void @foo5()
|
|
// CHECK-NOT: switch
|
|
// CHECK: }
|
|
void foo5(){
|
|
switch(0){
|
|
default:
|
|
if (0) {
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
// CHECK-LABEL: define{{.*}} void @foo6()
|
|
// CHECK-NOT: switch
|
|
// CHECK: }
|
|
void foo6(){
|
|
switch(0){
|
|
}
|
|
}
|
|
|
|
// CHECK-LABEL: define{{.*}} void @foo7()
|
|
// CHECK-NOT: switch
|
|
// CHECK: }
|
|
void foo7(){
|
|
switch(0){
|
|
foo7();
|
|
}
|
|
}
|
|
|
|
|
|
// CHECK-LABEL: define{{.*}} i32 @f8(
|
|
// CHECK: ret i32 3
|
|
// CHECK: }
|
|
int f8(unsigned x) {
|
|
switch(x) {
|
|
default:
|
|
return 3;
|
|
case 0xFFFFFFFF ... 1: // This range should be empty because x is unsigned.
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// Ensure that default after a case range is not ignored.
|
|
//
|
|
// CHECK-LABEL: define{{.*}} i32 @f9()
|
|
// CHECK: ret i32 10
|
|
// CHECK: }
|
|
static int f9_0(unsigned x) {
|
|
switch(x) {
|
|
case 10 ... 0xFFFFFFFF:
|
|
return 0;
|
|
default:
|
|
return 10;
|
|
}
|
|
}
|
|
int f9() {
|
|
return f9_0(2);
|
|
}
|
|
|
|
// Ensure that this doesn't compile to infinite loop in g() due to
|
|
// miscompilation of fallthrough from default to a (tested) case
|
|
// range.
|
|
//
|
|
// CHECK-LABEL: define{{.*}} i32 @f10()
|
|
// CHECK: ret i32 10
|
|
// CHECK: }
|
|
static int f10_0(unsigned x) {
|
|
switch(x) {
|
|
default:
|
|
x += 1;
|
|
case 10 ... 0xFFFFFFFF:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int f10() {
|
|
f10_0(1);
|
|
return 10;
|
|
}
|
|
|
|
// This generated incorrect code because of poor switch chaining.
|
|
//
|
|
// CHECK-LABEL: define{{.*}} i32 @f11(
|
|
// CHECK: ret i32 3
|
|
// CHECK: }
|
|
int f11(int x) {
|
|
switch(x) {
|
|
default:
|
|
return 3;
|
|
case 10 ... 0xFFFFFFFF:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// This just asserted because of the way case ranges were calculated.
|
|
//
|
|
// CHECK-LABEL: define{{.*}} i32 @f12(
|
|
// CHECK: ret i32 3
|
|
// CHECK: }
|
|
int f12(int x) {
|
|
switch (x) {
|
|
default:
|
|
return 3;
|
|
case 10 ... -1:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// Make sure return is not constant (if empty range is skipped or miscompiled)
|
|
//
|
|
// CHECK-LABEL: define{{.*}} i32 @f13(
|
|
// CHECK: ret i32 %
|
|
// CHECK: }
|
|
int f13(unsigned x) {
|
|
switch(x) {
|
|
case 2:
|
|
// fallthrough empty range
|
|
case 10 ... 9:
|
|
return 10;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// Don't delete a basic block that we want to introduce later references to.
|
|
// This isn't really specific to switches, but it's easy to show with them.
|
|
// rdar://problem/8837067
|
|
int f14(int x) {
|
|
switch (x) {
|
|
|
|
// case range so that the case block has no predecessors
|
|
case 0 ... 15:
|
|
// any expression which doesn't introduce a new block
|
|
(void) 0;
|
|
// kaboom
|
|
|
|
default:
|
|
return x;
|
|
}
|
|
}
|