#7116: Missing optimisation: strength reduction of floating-point multiplication
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Reporter: simonmar | Owner:
Type: bug | Status: patch
Priority: normal | Milestone: 7.8.1
Component: Compiler | Version: 7.4.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: Runtime performance bug | Unknown/Multiple
Test Case: | Difficulty: Unknown
Blocking: | Blocked By:
| Related Tickets:
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Comment (by jan.stolarek@…):
commit 838e2fda9892e61da85187803cce45b3f815b86e
{{{
Author: Jan Stolarek <[email protected]>
Date: Mon Jul 8 16:20:43 2013 +0100
Add strength reduction rules (Fixes #7116)
This patch adds rules for converting floating point multiplication
of the form 2.0 * x and x * 2.0 into addition x + x.
compiler/prelude/PrelRules.lhs | 33 +++++++++++++++++++++++++++------
1 file changed, 27 insertions(+), 6 deletions(-)
}}}
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7116#comment:9>
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The Glasgow Haskell Compiler
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