[Bug target/79793] Incorrect stack alignment for interrupt handler in 64-bit

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79793

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
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  Attachment #41826|0                           |1
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  Attachment #41828|0                           |1
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--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 41830
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41830&action=edit
An untested patch

The only interrupt failures are

FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  line 33 error == 0x12345670
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  line 33 frame->ip == 0x12345671
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  line 33 frame->cs == 0x12345672
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  line 33 frame->flags == 0x12345673
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  line 33 frame->sp == 0x12345674
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  line 33 frame->ss == 0x12345675