http://llvm.org/bugs/show_bug.cgi?id=7624
Summary: incorrect x87 code generated for comparison
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=5214)
--> (http://llvm.org/bugs/attachment.cgi?id=5214)
test case
With the attached test case I get:
$ clang -m32 -mno-sse -o w w.c
$ ./w
[should return after one second, but in fact loops forever]
The code generated for "while (get() < d)" looks like this:
8048440: e8 9b ff ff ff call 80483e0 <get>
8048445: dd 45 f0 fldl -0x10(%ebp)
8048448: da e9 fucompp
804844a: 76 0b jbe 8048457 <main+0x37>
This won't work because fucompp leaves the result of the comparison in the FPU
flags, but "jbe" tests the CPU flags.
I'm using Clang and LLVM built from trunk this morning, on Ubuntu 10.4 x86_64.
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