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List: llvm-bugs
Subject: [LLVMbugs] [Bug 13242] New: malloc (not alloca) optimization issue
From: bugzilla-daemon () llvm ! org
Date: 2012-06-29 19:51:28
Message-ID: bug-13242-206 () http ! llvm ! org/bugs/
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http://llvm.org/bugs/show_bug.cgi?id=13242
Bug #: 13242
Summary: malloc (not alloca) optimization issue
Product: new-bugs
Version: 3.1
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: unassignedbugs@nondot.org
ReportedBy: jimjim211112@yahoo.com
CC: llvmbugs@cs.uiuc.edu
Classification: Unclassified
Created attachment 8796
--> http://llvm.org/bugs/attachment.cgi?id=8796
C code running slow.
Hello fellow human beings.
Have attached some code. When compiling using clang with flags -O3 it produces
slow code.
If I change the malloc to alloca it produces fast (instant running time) code.
If commenting out one of the assignment in fac() function it is running fast
with malloc.
Using gcc instead of clang produces fast code with malloc.
Have I missed an optimization flag or is there something weird going on?
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