Hi,
This patch fixes the issue reported in PR78255 by making postreload
aware it should not be performing CSE on functions if NO_FUNCTION_CSE is
defined to true.
Bootstrap and full regression on arm-none-linux-gnueabihf and
aarch64-unknown-linux-gnu.
Also checked this fixed the reported issue on arm-none-eabi.
Is this OK for trunk?
Cheers,
Andre
gcc/ChangeLog
2016-12-09 Andre Vieira <andre.simoesdiasvie...@arm.com>
PR rtl-optimization/78255
* gcc/postreload.c (reload_cse_simplify): Do not CSE a function if
NO_FUNCTION_CSE is true.
gcc/testsuite/ChangeLog:
2016-12-09 Andre Vieira <andre.simoesdiasvie...@arm.com>
PR rtl-optimization/78255
* gcc.target/arm/pr78255-1.c: New.
* gcc.target/arm/pr78255-2.c: New.
gcc/testsuite/ChangeLog:
2016-12-09 Andre Vieira <andre.simoesdiasvie...@arm.com>
PR rtl-optimization/78255
* gcc.target/aarch64/pr78255.c: New.
diff --git a/gcc/postreload.c b/gcc/postreload.c
index
539ad33b6c3eb1b968677419a7420badc3a52f01..8325d121c403786fdb7804956724a81d134252a2
100644
--- a/gcc/postreload.c
+++ b/gcc/postreload.c
@@ -90,6 +90,11 @@ reload_cse_simplify (rtx_insn *insn, rtx testreg)
basic_block insn_bb = BLOCK_FOR_INSN (insn);
unsigned insn_bb_succs = EDGE_COUNT (insn_bb->succs);
+ /* If NO_FUNCTION_CSE has been set by the target, then we should not try
+ to cse function calls. */
+ if (NO_FUNCTION_CSE && CALL_P (insn))
+ return false;
+
if (GET_CODE (body) == SET)
{
int count = 0;
diff --git a/gcc/testsuite/gcc.target/aarch64/pr78255.c
b/gcc/testsuite/gcc.target/aarch64/pr78255.c
new file mode 100644
index
0000000000000000000000000000000000000000..b078cf3e1c1c7717c9e227721a367f9846f0c7fe
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/pr78255.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mcmodel=tiny" } */
+
+extern int bar (void *);
+
+int
+foo (void)
+{
+ return bar ((void *)bar);
+}
+
+/* { dg-final { scan-assembler "b\\s+bar" } } */
diff --git a/gcc/testsuite/gcc.target/arm/pr78255-1.c
b/gcc/testsuite/gcc.target/arm/pr78255-1.c
new file mode 100644
index
0000000000000000000000000000000000000000..4901acea51466c0bac92d9cb90e52b00b450d88a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pr78255-1.c
@@ -0,0 +1,57 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+#include <string.h>
+
+struct table_s
+ {
+ void (*fun0)
+ ( void );
+ void (*fun1)
+ ( void );
+ void (*fun2)
+ ( void );
+ void (*fun3)
+ ( void );
+ void (*fun4)
+ ( void );
+ void (*fun5)
+ ( void );
+ void (*fun6)
+ ( void );
+ void (*fun7)
+ ( void );
+ } table;
+
+void callback0(){__asm("mov r0, r0 \n\t");}
+void callback1(){__asm("mov r0, r0 \n\t");}
+void callback2(){__asm("mov r0, r0 \n\t");}
+void callback3(){__asm("mov r0, r0 \n\t");}
+void callback4(){__asm("mov r0, r0 \n\t");}
+
+void test (void) {
+ memset(&table, 0, sizeof table);
+
+ asm volatile ("" : : : "r3");
+
+ table.fun0 = callback0;
+ table.fun1 = callback1;
+ table.fun2 = callback2;
+ table.fun3 = callback3;
+ table.fun4 = callback4;
+ table.fun0();
+}
+
+void foo (void)
+{
+ __builtin_abort ();
+}
+
+int main (void)
+{
+ unsigned long p = (unsigned long) &foo;
+ asm volatile ("mov r3, %0" : : "r" (p));
+ test ();
+
+ return 0;
+}
diff --git a/gcc/testsuite/gcc.target/arm/pr78255-2.c
b/gcc/testsuite/gcc.target/arm/pr78255-2.c
new file mode 100644
index
0000000000000000000000000000000000000000..9e64ef3939465b088e35a01d4bb23fd50d43006d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pr78255-2.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+extern int bar (void *);
+
+int
+foo (void)
+{
+ return bar ((void*)bar);
+}
+
+/* { dg-final { scan-assembler "b\\s+bar" } } */
