Hexagon (tests/tcg/hexagon) fix inline asm in preg_alias.c

Replace consecutive inline asm blocks with a single one with proper
outputs/inputs/clobbers rather than making assumptions about register
values being carried between separate blocks.

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <20220210021556.9217-10-tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

tests/tcg/hexagon/preg_alias.c

@@ -1,5 +1,5 @@
 /*
- *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *  Copyright(c) 2019-2022 Qualcomm Innovation Center, Inc. All Rights Reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -57,17 +57,15 @@ typedef union {
 
 static inline void creg_alias(int cval, PRegs *pregs)
 {
-  unsigned char val;
-  asm volatile("c4 = %0" : : "r"(cval));
-
-  asm volatile("%0 = p0" : "=r"(val));
-  pregs->pregs.p0 = val;
-  asm volatile("%0 = p1" : "=r"(val));
-  pregs->pregs.p1 = val;
-  asm volatile("%0 = p2" : "=r"(val));
-  pregs->pregs.p2 = val;
-  asm volatile("%0 = p3" : "=r"(val));
-  pregs->pregs.p3 = val;
+  asm("c4 = %4\n\t"
+      "%0 = p0\n\t"
+      "%1 = p1\n\t"
+      "%2 = p2\n\t"
+      "%3 = p3\n\t"
+      : "=r"(pregs->pregs.p0), "=r"(pregs->pregs.p1),
+        "=r"(pregs->pregs.p2), "=r"(pregs->pregs.p3)
+      : "r"(cval)
+      : "p0", "p1", "p2", "p3");
 }
 
 int err;
@@ -83,19 +81,19 @@ static void check(int val, int expect)
 static inline void creg_alias_pair(unsigned int cval, PRegs *pregs)
 {
   unsigned long long cval_pair = (0xdeadbeefULL << 32) | cval;
-  unsigned char val;
   int c5;
-  asm volatile("c5:4 = %0" : : "r"(cval_pair));
-
-  asm volatile("%0 = p0" : "=r"(val));
-  pregs->pregs.p0 = val;
-  asm volatile("%0 = p1" : "=r"(val));
-  pregs->pregs.p1 = val;
-  asm volatile("%0 = p2" : "=r"(val));
-  pregs->pregs.p2 = val;
-  asm volatile("%0 = p3" : "=r"(val));
-  pregs->pregs.p3 = val;
-  asm volatile("%0 = c5" : "=r"(c5));
+
+  asm ("c5:4 = %5\n\t"
+       "%0 = p0\n\t"
+       "%1 = p1\n\t"
+       "%2 = p2\n\t"
+       "%3 = p3\n\t"
+       "%4 = c5\n\t"
+       : "=r"(pregs->pregs.p0), "=r"(pregs->pregs.p1),
+         "=r"(pregs->pregs.p2), "=r"(pregs->pregs.p3), "=r"(c5)
+       : "r"(cval_pair)
+       : "p0", "p1", "p2", "p3");
+
   check(c5, 0xdeadbeef);
 }