PR tree-optimization/42587 * gcc.target/i386/pr42587.c: New test. --- gcc/testsuite/gcc.target/i386/pr42587.c | 35 +++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 gcc/testsuite/gcc.target/i386/pr42587.c
diff --git a/gcc/testsuite/gcc.target/i386/pr42587.c b/gcc/testsuite/gcc.target/i386/pr42587.c new file mode 100644 index 00000000000..d4b5143eb6d --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr42587.c @@ -0,0 +1,35 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-store-merging" } */ + +typedef unsigned char u8; +typedef unsigned int u32; +union __anonunion_out_195 +{ + u32 value; + u8 bytes[4]; +}; +union __anonunion_in_196 +{ + u32 value; + u8 bytes[4]; +}; +extern void acpi_ut_track_stack_ptr (void); +u32 acpi_ut_dword_byte_swap (u32 value); +u32 +acpi_ut_dword_byte_swap (u32 value) +{ + union __anonunion_out_195 out; + union __anonunion_in_196 in; + + { + acpi_ut_track_stack_ptr (); + in.value = value; + out.bytes[0] = in.bytes[3]; + out.bytes[1] = in.bytes[2]; + out.bytes[2] = in.bytes[1]; + out.bytes[3] = in.bytes[0]; + return (out.value); + } +} + +/* { dg-final { scan-tree-dump "32 bit bswap implementation found at" "store-merging" } } */ -- 2.31.1