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<body><span class="vcard"><a class="email" href="mailto:manojgupta@google.com" title="Manoj Gupta <manojgupta@google.com>"> <span class="fn">Manoj Gupta</span></a>
</span> changed
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - ARM: Builtins should use AAPCS ABI for non-windows platforms"
href="https://bugs.llvm.org/show_bug.cgi?id=33030">bug 33030</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>INVALID
</td>
<td>---
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>RESOLVED
</td>
<td>REOPENED
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - ARM: Builtins should use AAPCS ABI for non-windows platforms"
href="https://bugs.llvm.org/show_bug.cgi?id=33030#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - ARM: Builtins should use AAPCS ABI for non-windows platforms"
href="https://bugs.llvm.org/show_bug.cgi?id=33030">bug 33030</a>
from <span class="vcard"><a class="email" href="mailto:manojgupta@google.com" title="Manoj Gupta <manojgupta@google.com>"> <span class="fn">Manoj Gupta</span></a>
</span></b>
<pre>Please note that I am referring only to builtins (__aeabi_* functions generally
provided in libgcc) that need aapcs ABI.
Other functions can use aapcs_vfp ABI, just not these builtins.
Here is an example to illustrate it.
$ cat arm_dltoul.c
unsigned long long convert(double a) {
return (unsigned long long)a;
}
$ bin/clang -target armv7a-unknown-linux-gnueabihf arm_dltoul.c -c -O2
$ objdump -d arm_dltoul.o
arm_dltoul.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <convert>: // Convert function itself uses aapcs_vfp ABI. Arg is in d0
0: e92d4800 push {fp, lr}
4: e1a0b00d mov fp, sp
8: ec510b10 vmov r0, r1, d0 // d0 is moved to r0 and r1
c: ebfffffe bl 0 <__aeabi_d2ulz> // __aebi_d2ulz expects args
in r0 and r1 using AAPCS ABI.
10: e8bd8800 pop {fp, pc}</pre>
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