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| author | Stephane Carrez <Stephane.Carrez@worldnet.fr> | 2001-05-05 08:59:32 +0200 |
|---|---|---|
| committer | Stephane Carrez <ciceron@gcc.gnu.org> | 2001-05-05 08:59:32 +0200 |
| commit | ce8882e65fe50cef8ead72670b17ecbedc7b25ef (patch) | |
| tree | 41cbbaa6d83d836b54d01b8b95a04543040effdd | |
| parent | a1fdc802bb9b01746af19487ef0ff6a60c90d844 (diff) | |
| download | gcc-ce8882e65fe50cef8ead72670b17ecbedc7b25ef.zip gcc-ce8882e65fe50cef8ead72670b17ecbedc7b25ef.tar.gz gcc-ce8882e65fe50cef8ead72670b17ecbedc7b25ef.tar.bz2 | |
m68hc11.c (m68hc11_gen_movhi): Optimize moves between X and Y by using sequences of xgdx and xgdy.
* config/m68hc11/m68hc11.c (m68hc11_gen_movhi): Optimize moves
between X and Y by using sequences of xgdx and xgdy.
From-SVN: r41861
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/m68hc11/m68hc11.c | 32 |
2 files changed, 33 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 15f07ba..2692493 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2001-05-05 Stephane Carrez <Stephane.Carrez@worldnet.fr> + * config/m68hc11/m68hc11.c (m68hc11_gen_movhi): Optimize moves + between X and Y by using sequences of xgdx and xgdy. + +2001-05-05 Stephane Carrez <Stephane.Carrez@worldnet.fr> + * config/m68hc11/m68hc11.md ("*logicalsi3_silshr16"): Use '?' instead of '!' for the 'D' alternative ('!' is too strong). ("*logicalsi3_silshl16"): Likewise. diff --git a/gcc/config/m68hc11/m68hc11.c b/gcc/config/m68hc11/m68hc11.c index 8aa5095..f9de2dc 100644 --- a/gcc/config/m68hc11/m68hc11.c +++ b/gcc/config/m68hc11/m68hc11.c @@ -3135,8 +3135,20 @@ m68hc11_gen_movhi (insn, operands) } else if (Y_REG_P (operands[1])) { - output_asm_insn ("sty\t%t1", operands); - output_asm_insn ("ldx\t%t1", operands); + /* When both D and Y are dead, use the sequence xgdy, xgdx + to move Y into X. The D and Y registers are modified. */ + if (optimize && find_regno_note (insn, REG_DEAD, HARD_Y_REGNUM) + && dead_register_here (insn, d_reg)) + { + output_asm_insn ("xgdy", operands); + output_asm_insn ("xgdx", operands); + CC_STATUS_INIT; + } + else + { + output_asm_insn ("sty\t%t1", operands); + output_asm_insn ("ldx\t%t1", operands); + } } else if (SP_REG_P (operands[1])) { @@ -3165,8 +3177,20 @@ m68hc11_gen_movhi (insn, operands) } else if (X_REG_P (operands[1])) { - output_asm_insn ("stx\t%t1", operands); - output_asm_insn ("ldy\t%t1", operands); + /* When both D and X are dead, use the sequence xgdx, xgdy + to move X into Y. The D and X registers are modified. */ + if (optimize && find_regno_note (insn, REG_DEAD, HARD_X_REGNUM) + && dead_register_here (insn, d_reg)) + { + output_asm_insn ("xgdx", operands); + output_asm_insn ("xgdy", operands); + CC_STATUS_INIT; + } + else + { + output_asm_insn ("stx\t%t1", operands); + output_asm_insn ("ldy\t%t1", operands); + } } else if (SP_REG_P (operands[1])) { |