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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Incorrect codegen for non-standard integer types"
href="https://llvm.org/bugs/show_bug.cgi?id=24789">24789</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Incorrect codegen for non-standard integer types
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sanjoy@playingwithpointers.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Running
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define i1 @f(i32* %ptr) {
entry:
%ptr.i10 = bitcast i32* %ptr to i10*
%val.i10 = load i10, i10* %ptr.i10
%cmp = icmp eq i10 %val.i10, 77
ret i1 %cmp
}
through llc -O3 gives
.text
.file "<stdin>"
.globl f
.align 16, 0x90
.type f,@function
f: # @f
.cfi_startproc
# BB#0: # %entry
movzwl (%rdi), %eax
cmpl $77, %eax
sete %al
retq
.Lfunc_end0:
.size f, .Lfunc_end0-f
.cfi_endproc
.section ".note.GNU-stack","",@progbits
I think the right behavior here is to mask out the lower 10 bits from %eax
before comparing it with $77.</pre>
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