| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // Check that the PowerPC vector registers are restored properly during |
| // unwinding. |
| |
| // REQUIRES: target=powerpc{{(64)?}}le-unknown-linux-gnu |
| // UNSUPPORTED: no-exceptions |
| |
| // Callee-saved VSR's 62 and 63 (vr30, vr31 respectively) are set to 16 bytes |
| // with values 1, 2 respectively in main. In order to ensure the two doublewords |
| // in each register are different, they are merged. Then they are reset to 16 |
| // bytes with values 9 and 12 respectively in a callee and an exception is |
| // thrown. When catching an exception in main, the values in the two registers |
| // need to be the original ones (including the correct doubleword order). |
| |
| #include <cassert> |
| #include <cstdlib> |
| |
| int __attribute__((noinline)) test2(int i) { |
| if (i > 3) |
| throw i; |
| srand(i); |
| return rand(); |
| } |
| |
| int __attribute__((noinline)) test(int i) { |
| // Clobber VS63 and VS62 in the function body. |
| // Set VS63 to 16 bytes each with value 9 |
| asm volatile("vspltisb 31, 9" : : : "v31"); |
| |
| // Set VS62 to 16 bytes each with value 12 |
| asm volatile("vspltisb 30, 12" : : : "v30"); |
| return test2(i); |
| } |
| |
| #define cmpVS63(vec, result) \ |
| { \ |
| vector unsigned char gbg; \ |
| asm volatile("vcmpequb. %[gbg], 31, %[veca];" \ |
| "mfocrf %[res], 2;" \ |
| "rlwinm %[res], %[res], 25, 31, 31" \ |
| : [res] "=r"(result), [gbg] "=v"(gbg) \ |
| : [veca] "v"(vec) \ |
| : "cr6"); \ |
| } |
| |
| #define cmpVS62(vec, result) \ |
| { \ |
| vector unsigned char gbg; \ |
| asm volatile("vcmpequb. %[gbg], 30, %[veca];" \ |
| "mfocrf %[res], 2;" \ |
| "rlwinm %[res], %[res], 25, 31, 31" \ |
| : [res] "=r"(result), [gbg] "=v"(gbg) \ |
| : [veca] "v"(vec) \ |
| : "cr6"); \ |
| } |
| |
| int main(int, char **) { |
| // Set VS63 to 16 bytes each with value 1. |
| asm volatile("vspltisb 31, 1" : : : "v31"); |
| |
| // Set VS62 to 16 bytes each with value 2. |
| asm volatile("vspltisb 30, 2" : : : "v30"); |
| |
| // Mix doublewords for both VS62 and VS63. |
| asm volatile("xxmrghd 63, 63, 62"); |
| asm volatile("xxmrghd 62, 63, 62"); |
| |
| vector unsigned long long expectedVS63Value = {0x202020202020202, |
| 0x101010101010101}; |
| vector unsigned long long expectedVS62Value = {0x202020202020202, |
| 0x101010101010101}; |
| try { |
| test(4); |
| } catch (int num) { |
| // If the unwinder restores VS63 and VS62 correctly, they should contain |
| // 0x01's and 0x02's respectively instead of 0x09's and 0x12's. |
| bool isEqualVS63, isEqualVS62; |
| cmpVS63(expectedVS63Value, isEqualVS63); |
| cmpVS62(expectedVS62Value, isEqualVS62); |
| assert(isEqualVS63 && isEqualVS62); |
| } |
| return 0; |
| } |