diff options
Diffstat (limited to 'gcc/config/sh/sh.c')
| -rw-r--r-- | gcc/config/sh/sh.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/config/sh/sh.c b/gcc/config/sh/sh.c index c0bfdd3af49..03c3c48c0e4 100644 --- a/gcc/config/sh/sh.c +++ b/gcc/config/sh/sh.c @@ -242,7 +242,7 @@ static void sh_file_start (void); static int flow_dependent_p (rtx, rtx); static void flow_dependent_p_1 (rtx, const_rtx, void *); static int shiftcosts (rtx); -static int and_xor_ior_costs (rtx, int code); +static int and_xor_ior_costs (rtx, int); static int addsubcosts (rtx); static int multcosts (rtx); static bool unspec_caller_rtx_p (rtx); @@ -2995,6 +2995,20 @@ sh_rtx_costs (rtx x, int code, int outer_code, int opno ATTRIBUTE_UNUSED, *total = 8; return true; + case EQ: + /* An and with a constant compared against zero is + most likely going to be a TST #imm, R0 instruction. + Notice that this does not catch the zero_extract variants from + the md file. */ + if (GET_CODE (XEXP (x, 0)) == AND + && CONST_INT_P (XEXP (x, 1)) && INTVAL (XEXP (x, 1)) == 0) + { + *total = 1; + return true; + } + else + return false; + case CONST: case LABEL_REF: case SYMBOL_REF: |