alpha: Fix invalid RTX in divmodsi insn patterns [PR115297]

any_divmod instructions are modelled with invalid RTX:

  [(set (match_operand:DI 0 "register_operand" "=c")
        (sign_extend:DI (match_operator:SI 3 "divmod_operator"
                        [(match_operand:DI 1 "register_operand" "a")
                         (match_operand:DI 2 "register_operand" "b")])))
   (clobber (reg:DI 23))
   (clobber (reg:DI 28))]

where SImode divmod_operator (div,mod,udiv,umod) has DImode operands.

Wrap input operand with truncate:SI to make machine modes consistent.

	PR target/115297

gcc/ChangeLog:

	* config/alpha/alpha.md (<any_divmod:code>si3): Wrap DImode
	operands 3 and 4 with truncate:SI RTX.
	(*divmodsi_internal_er): Ditto for operands 1 and 2.
	(*divmodsi_internal_er_1): Ditto.
	(*divmodsi_internal): Ditto.
	* config/alpha/constraints.md ("b"): Correct register
	number in the description.

gcc/testsuite/ChangeLog:

	* gcc.target/alpha/pr115297.c: New test.

diff --git a/gcc/config/alpha/alpha.md b/gcc/config/alpha/alpha.md
index 79f12c53c1688f145f0f51ae1a41409f2fa23ef2..1e2de5a4d15b652f7dc2d49d13e73e03326e6f29 100644 (file)
--- a/gcc/config/alpha/alpha.md
+++ b/gcc/config/alpha/alpha.md
@@ -725,7 +725,8 @@
        (sign_extend:DI (match_operand:SI 2 "nonimmediate_operand")))
    (parallel [(set (match_dup 5)
                   (sign_extend:DI
-                   (any_divmod:SI (match_dup 3) (match_dup 4))))
+                   (any_divmod:SI (truncate:SI (match_dup 3))
+                                  (truncate:SI (match_dup 4)))))
              (clobber (reg:DI 23))
              (clobber (reg:DI 28))])
    (set (match_operand:SI 0 "nonimmediate_operand")
@@ -751,9 +752,10 @@
 
 (define_insn_and_split "*divmodsi_internal_er"
   [(set (match_operand:DI 0 "register_operand" "=c")
-       (sign_extend:DI (match_operator:SI 3 "divmod_operator"
-                       [(match_operand:DI 1 "register_operand" "a")
-                        (match_operand:DI 2 "register_operand" "b")])))
+       (sign_extend:DI
+        (match_operator:SI 3 "divmod_operator"
+         [(truncate:SI (match_operand:DI 1 "register_operand" "a"))
+          (truncate:SI (match_operand:DI 2 "register_operand" "b"))])))
    (clobber (reg:DI 23))
    (clobber (reg:DI 28))]
   "TARGET_EXPLICIT_RELOCS && TARGET_ABI_OSF"
@@ -795,8 +797,8 @@
 (define_insn "*divmodsi_internal_er_1"
   [(set (match_operand:DI 0 "register_operand" "=c")
        (sign_extend:DI (match_operator:SI 3 "divmod_operator"
-                        [(match_operand:DI 1 "register_operand" "a")
-                         (match_operand:DI 2 "register_operand" "b")])))
+        [(truncate:SI (match_operand:DI 1 "register_operand" "a"))
+         (truncate:SI (match_operand:DI 2 "register_operand" "b"))])))
    (use (match_operand:DI 4 "register_operand" "c"))
    (use (match_operand 5 "const_int_operand"))
    (clobber (reg:DI 23))
@@ -808,9 +810,10 @@
 
 (define_insn "*divmodsi_internal"
   [(set (match_operand:DI 0 "register_operand" "=c")
-       (sign_extend:DI (match_operator:SI 3 "divmod_operator"
-                       [(match_operand:DI 1 "register_operand" "a")
-                        (match_operand:DI 2 "register_operand" "b")])))
+       (sign_extend:DI
+        (match_operator:SI 3 "divmod_operator"
+         [(truncate:SI (match_operand:DI 1 "register_operand" "a"))
+          (truncate:SI (match_operand:DI 2 "register_operand" "b"))])))
    (clobber (reg:DI 23))
    (clobber (reg:DI 28))]
   "TARGET_ABI_OSF"

diff --git a/gcc/config/alpha/constraints.md b/gcc/config/alpha/constraints.md
index 0d001ba26f146fd47bb9d1345b4460a692322f4f..4383f1fa895c8f7b4cc08a957bff45e71fbe6b95 100644 (file)
--- a/gcc/config/alpha/constraints.md
+++ b/gcc/config/alpha/constraints.md
@@ -27,7 +27,7 @@
  "General register 24, input to division routine")
 
 (define_register_constraint "b" "R25_REG"
- "General register 24, input to division routine")
+ "General register 25, input to division routine")
 
 (define_register_constraint "c" "R27_REG"
  "General register 27, function call address")

diff --git a/gcc/testsuite/gcc.target/alpha/pr115297.c b/gcc/testsuite/gcc.target/alpha/pr115297.c
new file mode 100644 (file)
index 0000000..4d5890e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/alpha/pr115297.c
@@ -0,0 +1,13 @@
+/* PR target/115297 */
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+enum { BPF_F_USER_BUILD_ID } __bpf_get_stack_size;
+long __bpf_get_stack_flags, bpf_get_stack___trans_tmp_2;
+
+void bpf_get_stack() {
+  unsigned elem_size;
+  int err = elem_size = __bpf_get_stack_flags ?: sizeof(long);
+  if (__builtin_expect(__bpf_get_stack_size % elem_size, 0))
+    bpf_get_stack___trans_tmp_2 = err;
+}