| 1 | // A contrived example to test the double jump removal peephole. |
|---|
| 2 | |
|---|
| 3 | // RUN: %clangxx %cxxflags -O0 %s -o %t.exe |
|---|
| 4 | // RUN: llvm-bolt %t.exe -o %t.bolt --peepholes=double-jumps | \ |
|---|
| 5 | // RUN: FileCheck %s -check-prefix=CHECKBOLT |
|---|
| 6 | // RUN: llvm-objdump --no-print-imm-hex -d %t.bolt | FileCheck %s |
|---|
| 7 | |
|---|
| 8 | // CHECKBOLT: BOLT-INFO: Peephole: 1 double jumps patched. |
|---|
| 9 | |
|---|
| 10 | // CHECK: <_Z3foom>: |
|---|
| 11 | // CHECK-NEXT: sub sp, sp, #16 |
|---|
| 12 | // CHECK-NEXT: str x0, [sp, #8] |
|---|
| 13 | // CHECK-NEXT: ldr [[REG:x[0-28]+]], [sp, #8] |
|---|
| 14 | // CHECK-NEXT: cmp [[REG]], #0 |
|---|
| 15 | // CHECK-NEXT: b.eq {{.*}} <_Z3foom+0x34> |
|---|
| 16 | // CHECK-NEXT: add [[REG]], [[REG]], #1 |
|---|
| 17 | // CHECK-NEXT: add [[REG]], [[REG]], #1 |
|---|
| 18 | // CHECK-NEXT: cmp [[REG]], #2 |
|---|
| 19 | // CHECK-NEXT: b.eq {{.*}} <_Z3foom+0x28> |
|---|
| 20 | // CHECK-NEXT: add [[REG]], [[REG]], #1 |
|---|
| 21 | // CHECK-NEXT: mov [[REG]], x1 |
|---|
| 22 | // CHECK-NEXT: ldr x1, [sp] |
|---|
| 23 | // CHECK-NEXT: b {{.*}} <bar> |
|---|
| 24 | // CHECK-NEXT: ldr x1, [sp] |
|---|
| 25 | // CHECK-NEXT: add [[REG]], [[REG]], #1 |
|---|
| 26 | // CHECK-NEXT: b {{.*}} <bar> |
|---|
| 27 | |
|---|
| 28 | extern "C" unsigned long bar(unsigned long count) { return count + 1; } |
|---|
| 29 | |
|---|
| 30 | unsigned long foo(unsigned long count) { |
|---|
| 31 | asm volatile(" cmp %0,#0\n" |
|---|
| 32 | " b.eq .L7\n" |
|---|
| 33 | " add %0, %0, #1\n" |
|---|
| 34 | " b .L1\n" |
|---|
| 35 | ".L1: b .L2\n" |
|---|
| 36 | ".L2: add %0, %0, #1\n" |
|---|
| 37 | " cmp %0, #2\n" |
|---|
| 38 | " b.ne .L3\n" |
|---|
| 39 | " b .L4\n" |
|---|
| 40 | ".L3: b .L5\n" |
|---|
| 41 | ".L5: add %0, %0, #1\n" |
|---|
| 42 | ".L4: mov %0,x1\n" |
|---|
| 43 | " ldr x1, [sp]\n" |
|---|
| 44 | " b .L6\n" |
|---|
| 45 | ".L7: ldr x1, [sp]\n" |
|---|
| 46 | " add %0, %0, #1\n" |
|---|
| 47 | " b .L6\n" |
|---|
| 48 | ".L6: b bar\n" |
|---|
| 49 | : |
|---|
| 50 | : "r" (count) |
|---|
| 51 | :); |
|---|
| 52 | return count; |
|---|
| 53 | } |
|---|
| 54 | |
|---|
| 55 | extern "C" int _start() { return foo(count: 38); } |
|---|
| 56 | |
|---|
