| commit | b49f1a7e7c85add83637cf7df46b8fc9b5b299e9 | |
| author | Alan Modra <amodra@gmail.com> | |
| Fri, 30 Nov 2018 13:35:25 +0000 (1 00:05 +1030) | ||
| committer | Alan Modra <amodra@gcc.gnu.org> | |
| Fri, 30 Nov 2018 13:35:25 +0000 (1 00:05 +1030) | ||
| tree | d3cba1d26194ebe465ba3abbdc1bc4b7e64133af | treesnapshot (tar.gz zip) |
| parent | ceb8c8c4cae47fd07cd7dda74bb31b98ce4adadc | commitdiff |
[RS6000] PowerPC64 soft-float
This patch aims to prevent long sequences loading soft-float
constants. For 32-bit, it makes sense to load values inline to a gpr
with lis, addi, but not so much for 64-bit where a 5 insn sequence
might be needed for each gpr. For TFmode in particular, a 10 insn
sequence is reduced to 2 loads from memory plus 1 or 2 address setup
insns.
* config/rs6000/predicates.md (easy_fp_constant): Avoid long
dependent insn sequences.
* config/rs6000/rs6000.c (num_insns_constant): Support long
double constants.
* config/rs6000/rs6000.md (mov<mode>_softfloat <FMOVE128>): Adjust
length attribute.
From-SVN: r266663
This patch aims to prevent long sequences loading soft-float
constants. For 32-bit, it makes sense to load values inline to a gpr
with lis, addi, but not so much for 64-bit where a 5 insn sequence
might be needed for each gpr. For TFmode in particular, a 10 insn
sequence is reduced to 2 loads from memory plus 1 or 2 address setup
insns.
* config/rs6000/predicates.md (easy_fp_constant): Avoid long
dependent insn sequences.
* config/rs6000/rs6000.c (num_insns_constant): Support long
double constants.
* config/rs6000/rs6000.md (mov<mode>_softfloat <FMOVE128>): Adjust
length attribute.
From-SVN: r266663
| gcc/ChangeLog | diffblobblamehistory | |
| gcc/config/rs6000/predicates.md | diffblobblamehistory | |
| gcc/config/rs6000/rs6000.c | diffblobblamehistory | |
| gcc/config/rs6000/rs6000.md | diffblobblamehistory |