diff options
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 68163e9ba2b..89ecd0c1982 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -2300,7 +2300,8 @@ synth_mult (struct algorithm *alg_out, unsigned HOST_WIDE_INT t, you should swap the two operands if OP0 would be constant. */ rtx -expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target, int unsignedp) +expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target, + int unsignedp) { rtx const_op1 = op1; @@ -2514,6 +2515,28 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target, int unsignedp } } + if (GET_CODE (op0) == CONST_DOUBLE) + { + rtx temp = op0; + op0 = op1; + op1 = temp; + } + + /* Expand x*2.0 as x+x. */ + if (GET_CODE (op1) == CONST_DOUBLE + && GET_MODE_CLASS (mode) == MODE_FLOAT) + { + REAL_VALUE_TYPE d; + REAL_VALUE_FROM_CONST_DOUBLE (d, op1); + + if (REAL_VALUES_EQUAL (d, dconst2)) + { + op0 = force_reg (GET_MODE (op0), op0); + return expand_binop (mode, add_optab, op0, op0, + target, unsignedp, OPTAB_LIB_WIDEN); + } + } + /* This used to use umul_optab if unsigned, but for non-widening multiply there is no difference between signed and unsigned. */ op0 = expand_binop (mode, |