This patch adds a function for testing whether an arbitrary mode X
is an integer mode that is narrower than integer mode Y. This is
useful for code like expand_float and expand_fix that could in
principle handle vectors as well as scalars.
2017-10-23 Richard Sandiford <richard.sandif...@linaro.org>
Alan Hayward <alan.hayw...@arm.com>
David Sherwood <david.sherw...@arm.com>
gcc/
* machmode.h (is_narrower_int_mode): New function
* optabs.c (expand_float, expand_fix): Use it.
* dwarf2out.c (rotate_loc_descriptor): Likewise.
Index: gcc/machmode.h
===================================================================
--- gcc/machmode.h 2017-10-23 11:44:06.561720156 +0100
+++ gcc/machmode.h 2017-10-23 11:44:23.979432614 +0100
@@ -893,6 +893,17 @@ is_complex_float_mode (machine_mode mode
return false;
}
+/* Return true if MODE is a scalar integer mode with a precision
+ smaller than LIMIT's precision. */
+
+inline bool
+is_narrower_int_mode (machine_mode mode, scalar_int_mode limit)
+{
+ scalar_int_mode int_mode;
+ return (is_a <scalar_int_mode> (mode, &int_mode)
+ && GET_MODE_PRECISION (int_mode) < GET_MODE_PRECISION (limit));
+}
+
namespace mode_iterator
{
/* Start mode iterator *ITER at the first mode in class MCLASS, if any. */
Index: gcc/optabs.c
===================================================================
--- gcc/optabs.c 2017-10-23 11:44:07.732431531 +0100
+++ gcc/optabs.c 2017-10-23 11:44:23.980398548 +0100
@@ -4820,7 +4820,7 @@ expand_float (rtx to, rtx from, int unsi
rtx value;
convert_optab tab = unsignedp ? ufloat_optab : sfloat_optab;
- if (GET_MODE_PRECISION (GET_MODE (from)) < GET_MODE_PRECISION (SImode))
+ if (is_narrower_int_mode (GET_MODE (from), SImode))
from = convert_to_mode (SImode, from, unsignedp);
libfunc = convert_optab_libfunc (tab, GET_MODE (to), GET_MODE (from));
@@ -5002,7 +5002,7 @@ expand_fix (rtx to, rtx from, int unsign
that the mode of TO is at least as wide as SImode, since those are the
only library calls we know about. */
- if (GET_MODE_PRECISION (GET_MODE (to)) < GET_MODE_PRECISION (SImode))
+ if (is_narrower_int_mode (GET_MODE (to), SImode))
{
target = gen_reg_rtx (SImode);
Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c 2017-10-23 11:44:05.684652559 +0100
+++ gcc/dwarf2out.c 2017-10-23 11:44:23.979432614 +0100
@@ -14530,8 +14530,7 @@ rotate_loc_descriptor (rtx rtl, scalar_i
dw_loc_descr_ref op0, op1, ret, mask[2] = { NULL, NULL };
int i;
- if (GET_MODE (rtlop1) != VOIDmode
- && GET_MODE_BITSIZE (GET_MODE (rtlop1)) < GET_MODE_BITSIZE (mode))
+ if (is_narrower_int_mode (GET_MODE (rtlop1), mode))
rtlop1 = gen_rtx_ZERO_EXTEND (mode, rtlop1);
op0 = mem_loc_descriptor (XEXP (rtl, 0), mode, mem_mode,
VAR_INIT_STATUS_INITIALIZED);
