From c3741733dbd0155d869ebfc9ead24a0d885fe27c Mon Sep 17 00:00:00 2001 From: Richard Kenner Date: Wed, 18 Sep 1996 17:33:30 -0400 Subject: [PATCH] (alpha_emit_set_long_const): Save one instruction when -O2 and high word == low word. From-SVN: r12740 --- gcc/config/alpha/alpha.c | 39 +++++++++++++++++++++++---------------- 1 file changed, 23 insertions(+), 16 deletions(-) diff --git a/gcc/config/alpha/alpha.c b/gcc/config/alpha/alpha.c index ddc64d94c78..4360b5659ee 100644 --- a/gcc/config/alpha/alpha.c +++ b/gcc/config/alpha/alpha.c @@ -981,7 +981,7 @@ alpha_emit_set_long_const (target, c) = (flag_expensive_optimizations && rtx_equal_function_value_matters ? 0 : target); HOST_WIDE_INT d1, d2, d3, d4; - rtx r; + rtx r1, r2; /* Decompose the entire word */ d1 = ((c & 0xffff) ^ 0x8000) - 0x8000; @@ -997,29 +997,36 @@ alpha_emit_set_long_const (target, c) /* Construct the high word */ if (d3 == 0) - r = copy_to_suggested_reg (GEN_INT (d4), subtarget, DImode); + r1 = copy_to_suggested_reg (GEN_INT (d4), subtarget, DImode); else if (d4 == 0) - r = copy_to_suggested_reg (GEN_INT (d3), subtarget, DImode); + r1 = copy_to_suggested_reg (GEN_INT (d3), subtarget, DImode); else - r = expand_binop (DImode, add_optab, GEN_INT (d3), GEN_INT (d4), - subtarget, 0, OPTAB_WIDEN); + r1 = expand_binop (DImode, add_optab, GEN_INT (d3), GEN_INT (d4), + subtarget, 0, OPTAB_WIDEN); /* Shift it into place */ - r = expand_binop (DImode, ashl_optab, r, GEN_INT (32), - subtarget, 0, OPTAB_WIDEN); + r2 = expand_binop (DImode, ashl_optab, r1, GEN_INT (32), + subtarget, 0, OPTAB_WIDEN); - /* Add in the low word */ - if (d2 != 0) - r = expand_binop (DImode, add_optab, r, GEN_INT (d2), - subtarget, 0, OPTAB_WIDEN); - if (d1 != 0) - r = expand_binop (DImode, add_optab, r, GEN_INT (d1), - subtarget, 0, OPTAB_WIDEN); + if (subtarget == 0 && d1 == d3 && d2 == d4) + r1 = expand_binop (DImode, add_optab, r1, r2, subtarget, 0, OPTAB_WIDEN); + else + { + r1 = r2; + + /* Add in the low word */ + if (d2 != 0) + r1 = expand_binop (DImode, add_optab, r1, GEN_INT (d2), + subtarget, 0, OPTAB_WIDEN); + if (d1 != 0) + r1 = expand_binop (DImode, add_optab, r1, GEN_INT (d1), + subtarget, 0, OPTAB_WIDEN); + } if (subtarget == 0) - r = copy_to_suggested_reg(r, target, DImode); + r1 = copy_to_suggested_reg(r1, target, DImode); - return r; + return r1; } #endif /* HOST_BITS_PER_WIDE_INT == 64 */ -- 2.30.2