http://llvm.org/bugs/show_bug.cgi?id=12545
Bug #: 12545
Summary: suboptimal codegen for if (x == -y)
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 8383
--> http://llvm.org/bugs/attachment.cgi?id=8383
c source
With the attached source, clang (trunk r154661) codegens the comparison as:
$ clang -S -O3 -o - f.c
...
negl %esi
cmpl %esi, %edi
je .LBB0_2
GCC (Ubuntu/Linaro 4.6.1-9ubuntu3) does better:
$ gcc -S -O3 -o - f.c
...
addl %esi, %edi
je .L4
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