| commit | bbead5babc046279d886b059e68e613b0185b2ff | |
| author | Richard Earnshaw <rearnsha@arm.com> | |
| Fri, 18 Oct 2019 19:02:50 +0000 (18 19:02 +0000) | ||
| committer | Richard Earnshaw <rearnsha@gcc.gnu.org> | |
| Fri, 18 Oct 2019 19:02:50 +0000 (18 19:02 +0000) | ||
| tree | 124a99d80876a893377cb89eb847f09c6eca55f6 | treesnapshot (tar.gz zip) |
| parent | 0a67306e3cc2adfe0ef2fe313a86f57141ab57b2 | commitdiff |
[arm] Correct cost calculations involving borrow for subtracts.
The rtx_cost calculations when a borrow operation was being performed were
not being calculated correctly. The borrow is free as part of the
subtract-with-carry instructions. This patch recognizes the various
idioms that can describe this and returns the correct costs.
* config/arm/arm.c (arm_rtx_costs_internal, case MINUS): Handle
borrow operations.
From-SVN: r277173
The rtx_cost calculations when a borrow operation was being performed were
not being calculated correctly. The borrow is free as part of the
subtract-with-carry instructions. This patch recognizes the various
idioms that can describe this and returns the correct costs.
* config/arm/arm.c (arm_rtx_costs_internal, case MINUS): Handle
borrow operations.
From-SVN: r277173
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