From: Jakub Jelinek Date: Tue, 5 Feb 2013 15:54:39 +0000 (+0100) Subject: re PR tree-optimization/56205 (stdarg pass confused by jump threading) X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=11f1e3ab239b3a45b085ca5eb1327f1254fb6205;p=gcc.git re PR tree-optimization/56205 (stdarg pass confused by jump threading) PR tree-optimization/56205 * tree-stdarg.c (check_all_va_list_escapes): Return true if there are any PHI nodes that set non-va_list_escape_vars SSA_NAME and some va_list_escape_vars SSA_NAME appears in some PHI argument. * gcc.dg/tree-ssa/stdarg-6.c: New test. * gcc.c-torture/execute/pr56205.c: New test. From-SVN: r195760 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 595dad4cf5b..a6ab680cc8a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2013-02-05 Jakub Jelinek + + PR tree-optimization/56205 + * tree-stdarg.c (check_all_va_list_escapes): Return true if + there are any PHI nodes that set non-va_list_escape_vars SSA_NAME + and some va_list_escape_vars SSA_NAME appears in some PHI argument. + 2013-02-05 Richard Biener PR tree-optimization/53342 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index a9d19c9cfab..dc716f97bb9 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2013-02-05 Jakub Jelinek + + PR tree-optimization/56205 + * gcc.dg/tree-ssa/stdarg-6.c: New test. + * gcc.c-torture/execute/pr56205.c: New test. + 2013-02-05 Richard Biener PR tree-optimization/53342 diff --git a/gcc/testsuite/gcc.c-torture/execute/pr56205.c b/gcc/testsuite/gcc.c-torture/execute/pr56205.c new file mode 100644 index 00000000000..bf39685946b --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/pr56205.c @@ -0,0 +1,61 @@ +/* PR tree-optimization/56205 */ + +#include + +int a, b; +char c[128]; + +__attribute__((noinline, noclone)) static void +f1 (const char *fmt, ...) +{ + va_list ap; + asm volatile ("" : : : "memory"); + if (__builtin_strcmp (fmt, "%s %d %s") != 0) + __builtin_abort (); + va_start (ap, fmt); + if (__builtin_strcmp (va_arg (ap, const char *), "foo") != 0 + || va_arg (ap, int) != 1 + || __builtin_strcmp (va_arg (ap, const char *), "bar") != 0) + __builtin_abort (); + va_end (ap); +} + +__attribute__((noinline, noclone)) static void +f2 (const char *fmt, va_list ap) +{ + asm volatile ("" : : : "memory"); + if (__builtin_strcmp (fmt, "baz") != 0 + || __builtin_strcmp (va_arg (ap, const char *), "foo") != 0 + || va_arg (ap, double) != 12.0 + || va_arg (ap, int) != 26) + __builtin_abort (); +} + +static void +f3 (int x, char const *y, va_list z) +{ + f1 ("%s %d %s", x ? "" : "foo", ++a, (y && *y) ? "bar" : ""); + if (y && *y) + f2 (y, z); +} + +__attribute__((noinline, noclone)) void +f4 (int x, char const *y, ...) +{ + va_list z; + va_start (z, y); + if (!x && *c == '\0') + ++b; + f3 (x, y, z); + va_end (z); +} + +int +main () +{ + asm volatile ("" : : : "memory"); + f4 (0, "baz", "foo", 12.0, 26); + if (a != 1 || b != 1) + __builtin_abort (); + return 0; +} diff --git a/gcc/testsuite/gcc.dg/tree-ssa/stdarg-6.c b/gcc/testsuite/gcc.dg/tree-ssa/stdarg-6.c new file mode 100644 index 00000000000..c21dc17b527 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/stdarg-6.c @@ -0,0 +1,35 @@ +/* PR tree-optimization/56205 */ +/* { dg-do compile } */ +/* { dg-options "-O3 -fdump-tree-stdarg" } */ + +#include + +int a, b; +char c[128]; + +static inline void +foo (int x, char const *y, va_list z) +{ + __builtin_printf ("%s %d %s", x ? "" : "foo", ++a, (y && *y) ? "bar" : ""); + if (y && *y) + __builtin_vprintf (y, z); +} + +void +bar (int x, char const *y, ...) +{ + va_list z; + va_start (z, y); + if (!x && *c == '\0') + ++b; + foo (x, y, z); + va_end (z); +} + +/* { dg-final { scan-tree-dump "bar: va_list escapes 1, needs to save all GPR units and all FPR units" "stdarg" { target { { i?86-*-* x86_64-*-* } && { ! { ia32 } } } } } } */ +/* { dg-final { scan-tree-dump "bar: va_list escapes 1, needs to save all GPR units and all FPR units" "stdarg" { target { powerpc*-*-linux* && ilp32 } } } } */ +/* { dg-final { scan-tree-dump "bar: va_list escapes 1, needs to save all GPR units and all FPR units" "stdarg" { target alpha*-*-linux* } } } */ +/* { dg-final { scan-tree-dump "bar: va_list escapes 1, needs to save all GPR units and all FPR units" "stdarg" { target s390*-*-linux* } } } */ +/* { dg-final { scan-tree-dump "bar: va_list escapes 1, needs to save all GPR units" "stdarg" { target { { i?86-*-* x86_64-*-* } && ia32 } } } } */ +/* { dg-final { scan-tree-dump "bar: va_list escapes 1, needs to save all GPR units" "stdarg" { target ia64-*-* } } } */ +/* { dg-final { scan-tree-dump "bar: va_list escapes 1, needs to save all GPR units" "stdarg" { target { powerpc*-*-* && lp64 } } } } */ diff --git a/gcc/tree-stdarg.c b/gcc/tree-stdarg.c index cd573a339cf..8ad9fc2d22e 100644 --- a/gcc/tree-stdarg.c +++ b/gcc/tree-stdarg.c @@ -526,6 +526,37 @@ check_all_va_list_escapes (struct stdarg_info *si) { gimple_stmt_iterator i; + for (i = gsi_start_phis (bb); !gsi_end_p (i); gsi_next (&i)) + { + tree lhs; + use_operand_p uop; + ssa_op_iter soi; + gimple phi = gsi_stmt (i); + + lhs = PHI_RESULT (phi); + if (virtual_operand_p (lhs) + || bitmap_bit_p (si->va_list_escape_vars, + SSA_NAME_VERSION (lhs))) + continue; + + FOR_EACH_PHI_ARG (uop, phi, soi, SSA_OP_USE) + { + tree rhs = USE_FROM_PTR (uop); + if (TREE_CODE (rhs) == SSA_NAME + && bitmap_bit_p (si->va_list_escape_vars, + SSA_NAME_VERSION (rhs))) + { + if (dump_file && (dump_flags & TDF_DETAILS)) + { + fputs ("va_list escapes in ", dump_file); + print_gimple_stmt (dump_file, phi, 0, dump_flags); + fputc ('\n', dump_file); + } + return true; + } + } + } + for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i)) { gimple stmt = gsi_stmt (i);