Bug 28108 - Some cse optimizations require hash collisions
Summary: Some cse optimizations require hash collisions
Status: NEW
Alias: None
Product: gcc
Classification: Unclassified
Component: rtl-optimization (show other bugs)
Version: 4.2.0
: P3 normal
Target Milestone: ---
Assignee: Not yet assigned to anyone
URL:
Keywords: internal-improvement, missed-optimization
Depends on: 22445
Blocks: 29842
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Reported: 2006-06-20 19:40 UTC by Jorn Wolfgang Rennecke
Modified: 2021-09-01 02:58 UTC (History)
1 user (show)

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Target:
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Known to work:
Known to fail:
Last reconfirmed: 2021-08-31 00:00:00


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Description Jorn Wolfgang Rennecke 2006-06-20 19:40:18 UTC
cse.c:hash_rtx has the same problem as found before in cse.c:cselib_hash_rtx
(PR rtl-optimization/22445).  Hence, some optimiztions will only be done
if there is a convenient hash collision.

I.e. the MODE should not be used to calculate the hash value.