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Remove global call sets: function.c 

Whatever the rights and wrongs of the way aggregate_value_p
handles call-preserved registers, it's a de facto part of the ABI,
so we shouldn't change it.  The patch simply extends the current
approach to whatever call-preserved set the function happens to
be using.

2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* function.c (aggregate_value_p): Work out which ABI the
	function is using before testing which registers are at least
	partly preserved by a call.

From-SVN: r276322
This commit is contained in:
Richard Sandiford 2019-09-30 16:20:41 +00:00 committed by Richard Sandiford
parent 1849569621
commit c1b582720a
2 changed files with 14 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-09-30 Richard Sandiford <richard.sandiford@arm.com>
* function.c (aggregate_value_p): Work out which ABI the
function is using before testing which registers are at least
partly preserved by a call.
2019-09-30 Richard Sandiford <richard.sandiford@arm.com>
* early-remat.c: Include regs.h and function-abi.h.

9
gcc/function.c
View File

@ -2120,10 +2120,17 @@ aggregate_value_p (const_tree exp, const_tree fntype)
if (!REG_P (reg))
return 0;
/* Use the default ABI if the type of the function isn't known.
The scheme for handling interoperability between different ABIs
requires us to be able to tell when we're calling a function with
a nondefault ABI. */
const predefined_function_abi &abi = (fntype
? fntype_abi (fntype)
: default_function_abi);
regno = REGNO (reg);
nregs = hard_regno_nregs (regno, TYPE_MODE (type));
for (i = 0; i < nregs; i++)
if (! call_used_or_fixed_reg_p (regno + i))
if (!fixed_regs[regno + i] && !abi.clobbers_full_reg_p (regno + i))
return 1;
return 0;