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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Regression of llc between LLVM revisions 213897 and 213898."
href="http://llvm.org/bugs/show_bug.cgi?id=20472">20472</a>
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<th>Summary</th>
<td>Regression of llc between LLVM revisions 213897 and 213898.
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>llc
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>anton.mitrokhin@phystech.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Reproducer:
a.ll:
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nounwind
define void @f_fu(float* noalias nocapture %RET) #1 {
allocas:
%resultvec.i67 = select <8 x i1> <i1 1, i1 0, i1 0, i1 1, i1 1, i1 1, i1 1,
i1 0>, <8 x i16> <i16 128, i16 128, i16 128, i16 128, i16 128, i16 128, i16
128, i16 128>, <8 x i16> <i16 -500, i16 -500, i16 -500, i16 -500, i16 -500, i16
-500, i16 -500, i16 -500>
%result_load15_to_int8.i = trunc <8 x i16> %resultvec.i67 to <8 x i8>
%calltmp_to_float = sitofp <8 x i8> %result_load15_to_int8.i to <8 x float>
%ptrcast = bitcast float* %RET to <8 x float>*
store <8 x float> %calltmp_to_float, <8 x float>* %ptrcast, align 4
ret void
}
test_static.cpp:
#include <stdio.h>
extern "C" {
extern void f_fu(float *result);
}
int main(int argc, char *argv[]) {
float returned_result[4];
f_fu(returned_result);
printf("\n");
printf("res[0] = %f\n", returned_result[0]);
printf("res[1] = %f\n", returned_result[1]);
return 0;
}
Building:
.../llvm/bin-trunk_r213897/bin/llc a.ll -o old.s --mattr='+sse4.1'
clang++ test_static.cpp old.s -o bin_old
.../llvm/bin-trunk_r213898/bin/llc a.ll -o new.s --mattr='+sse4.1'
clang++ test_static.cpp new.s -o bin_new
right:
./bin_old
res[0] = -128.000000
res[1] = 12.000000
wrong:
./bin_new
res[0] = 128.000000
res[1] = -500.000000</pre>
</div>
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