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Add cases for SIGN_EXTEND and ZERO_EXTEND to RTX_COSTS

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From-SVN: r13073
This commit is contained in:
Ian Lance Taylor 1996-10-29 05:54:16 +00:00
parent 6f628f9d45
commit 1a4fa807f1
1 changed files with 18 additions and 1 deletions
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19
gcc/config/mips/mips.h
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@ -3026,7 +3026,24 @@ while (0)
else if (mips_cpu == PROCESSOR_R5000) \
return COSTS_N_INSNS (36); \
else \
return COSTS_N_INSNS (69);
return COSTS_N_INSNS (69); \
\
case SIGN_EXTEND: \
/* A sign extend from SImode to DImode in 64 bit mode is often \
zero instructions, because the result can often be used \
directly by another instruction; we'll call it one. */ \
if (TARGET_64BIT && GET_MODE (X) == DImode \
&& GET_MODE (XEXP (X, 0)) == SImode) \
return COSTS_N_INSNS (1); \
else \
return COSTS_N_INSNS (2); \
\
case ZERO_EXTEND: \
if (TARGET_64BIT && GET_MODE (X) == DImode \
&& GET_MODE (XEXP (X, 0)) == SImode) \
return COSTS_N_INSNS (2); \
else \
return COSTS_N_INSNS (1);
/* An expression giving the cost of an addressing mode that
contains ADDRESS. If not defined, the cost is computed from the