<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [ARM] Unnecessary callee saved VFP reg is used"
href="http://llvm.org/bugs/show_bug.cgi?id=19167">19167</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[ARM] Unnecessary callee saved VFP reg is used
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>weimingz@codeaurora.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>For the following code:
target triple = "thumbv7--linux-gnueabi"
declare float @foo()
declare float @bar()
define float @test() minsize {
entry:
%call1 = call float @foo()
%call2 = call float @bar()
%sum = fadd float %call1, %call2
ret float %sum
}
llc -O3 < test.ll generates:
.text
.syntax unified
.eabi_attribute 6, 10 @ Tag_CPU_arch
.eabi_attribute 8, 1 @ Tag_ARM_ISA_use
.eabi_attribute 9, 2 @ Tag_THUMB_ISA_use
.fpu neon
.eabi_attribute 20, 1 @ Tag_ABI_FP_denormal
.eabi_attribute 21, 1 @ Tag_ABI_FP_exceptions
.eabi_attribute 23, 3 @ Tag_ABI_FP_number_model
.eabi_attribute 24, 1 @ Tag_ABI_align_needed
.eabi_attribute 25, 1 @ Tag_ABI_align_preserved
.file "<stdin>"
.globl test
.align 2
.type test,%function
.code 16 @ @test
.thumb_func
test:
.fnstart
.Leh_func_begin0:
@ BB#0: @ %entry
.save {r11, lr}
push.w {r11, lr}
.vsave {d8}
vpush {d8}
bl foo
vmov s16, r0 ================> why use s16 instead of s1 ?
bl bar
vmov s0, r0
vadd.f32 s0, s16, s0
vmov r0, s0
vpop {d8}
pop.w {r11, pc}
.Ltmp0:
.size test, .Ltmp0-test
.Leh_func_end0:
.fnend
same for using -O2 and/or minsize attribute.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>