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(shiftcosts, genshifty_op): Add SH3 support. 

From-SVN: r9813
This commit is contained in:
Jim Wilson 1995-05-24 18:38:04 -07:00
parent 6b005b889e
commit 20b04867c8
1 changed files with 13 additions and 0 deletions
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13
gcc/config/sh/sh.c
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@ -36,6 +36,7 @@
#define MSW (TARGET_LITTLE_ENDIAN ? 1 : 0)
#define LSW (TARGET_LITTLE_ENDIAN ? 0 : 1)
/* ??? The pragma interrupt support will not work for SH3. */
/* This is set by #pragma interrupt and #pragma trapa, and causes gcc to
output code for the next function appropriate for an interrupt handler. */
int pragma_interrupt;
@ -735,6 +736,9 @@ shiftcosts (x)
/* If shift by a non constant, then this will be expensive. */
if (GET_CODE (XEXP (x, 1)) != CONST_INT)
{
if (TARGET_SH3)
return 2;
/* If not an sh3 then we don't even have an instruction for it. */
return 20;
}
@ -836,6 +840,8 @@ gen_ashift (type, n, reg)
/* Output RTL to split a constant shift into its component SH constant
shift instructions. */
/* ??? For SH3, should reject constant shifts when slower than loading the
shift count into a register? */
int
gen_shifty_op (code, operands)
@ -884,6 +890,13 @@ expand_ashiftrt (operands)
tree func_name;
int value;
if (TARGET_SH3 && GET_CODE (operands[2]) != CONST_INT)
{
rtx count = copy_to_mode_reg (SImode, operands[2]);
emit_insn (gen_negsi2 (count, count));
emit_insn (gen_ashrsi3_d (operands[0], operands[1], count));
return 1;
}
if (GET_CODE (operands[2]) != CONST_INT)
return 0;