diff options
Diffstat (limited to 'gcc/optabs.c')
| -rw-r--r-- | gcc/optabs.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index 466a56c7c14..9f73ac1eecf 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -1184,7 +1184,9 @@ expand_binop (enum machine_mode mode, optab binoptab, rtx op0, rtx op1, if (temp != 0) { - if (GET_MODE_CLASS (mode) == MODE_INT) + if (GET_MODE_CLASS (mode) == MODE_INT + && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), + GET_MODE_BITSIZE (GET_MODE (temp)))) return gen_lowpart (mode, temp); else return convert_to_mode (mode, temp, unsignedp); @@ -1231,7 +1233,9 @@ expand_binop (enum machine_mode mode, optab binoptab, rtx op0, rtx op1, unsignedp, OPTAB_DIRECT); if (temp) { - if (class != MODE_INT) + if (class != MODE_INT + || !TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), + GET_MODE_BITSIZE (wider_mode))) { if (target == 0) target = gen_reg_rtx (mode); @@ -1759,7 +1763,9 @@ expand_binop (enum machine_mode mode, optab binoptab, rtx op0, rtx op1, unsignedp, methods); if (temp) { - if (class != MODE_INT) + if (class != MODE_INT + || !TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), + GET_MODE_BITSIZE (wider_mode))) { if (target == 0) target = gen_reg_rtx (mode); |