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rs6000: Fix vector homogeneous aggregates (PR86197) 

The existing code allows only 4 vectors worth of ieee128 homogeneous
aggregates, but it should be 8.  This happens because at one spot it
is mistakenly qualified as being passed in floating point registers.


	PR target/86197
	* config/rs6000/rs6000.md (rs6000_discover_homogeneous_aggregate): An
	ieee128 argument takes up only one (vector) register, not two (floating
	point) registers.

From-SVN: r261738
This commit is contained in:
Segher Boessenkool 2018-06-19 12:52:39 +02:00 committed by Segher Boessenkool
parent 7f1387e0f2
commit 6b3a917093
2 changed files with 10 additions and 3 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2018-06-19 Segher Boessenkool <segher@kernel.crashing.org>
PR target/86197
* config/rs6000/rs6000.md (rs6000_discover_homogeneous_aggregate): An
ieee128 argument takes up only one (vector) register, not two (floating
point) registers.
2018-06-19 Eric Botcazou <ebotcazou@adacore.com> 2018-06-19 Eric Botcazou <ebotcazou@adacore.com>
* gimplify.c (gimplify_init_constructor): Really never clear for an * gimplify.c (gimplify_init_constructor): Really never clear for an

6
gcc/config/rs6000/rs6000.c
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@ -10887,12 +10887,12 @@ rs6000_discover_homogeneous_aggregate (machine_mode mode, const_tree type,
if (field_count > 0) if (field_count > 0)
{ {
int n_regs = (SCALAR_FLOAT_MODE_P (field_mode) ? int reg_size = ALTIVEC_OR_VSX_VECTOR_MODE (field_mode) ? 16 : 8;
(GET_MODE_SIZE (field_mode) + 7) >> 3 : 1); int field_size = ROUND_UP (GET_MODE_SIZE (field_mode), reg_size);
/* The ELFv2 ABI allows homogeneous aggregates to occupy /* The ELFv2 ABI allows homogeneous aggregates to occupy
up to AGGR_ARG_NUM_REG registers. */ up to AGGR_ARG_NUM_REG registers. */
if (field_count * n_regs <= AGGR_ARG_NUM_REG) if (field_count * field_size <= AGGR_ARG_NUM_REG * reg_size)
{ {
if (elt_mode) if (elt_mode)
*elt_mode = field_mode; *elt_mode = field_mode;