https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66215
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #1)
> Following testcase is wrongly compiled event with -O2 optimization level.
>
> $ cat o2-test-case.c
> static int a;
>
> int t(int tt)
> {
> switch (tt)
> {
> case 1: return a;
> }
>
> return 0;
> }
>
> $ ./xgcc -B. -mhotpatch=2,3 -O2 -fno-inline -o /tmp/test.s -S o2-test-case.c
> $ head -n20 /tmp/test.s
>
> .file "o2-test-case.c"
> .text
> .align 8
> .globl t
> .type t, @function
> nopr %r7 # pre-label NOPs for hotpatch (2 halfwords)
> nopr %r7
> # alignment for hotpatch
> .align 8
> t:
> marxin@marxinbox:~/Programming/gcc2/objdir/gcc> head -n20 /tmp/test.s
> .file "o2-test-case.c"
> .text
> .align 8
> .globl t
> .type t, @function
> nopr %r7 # pre-label NOPs for hotpatch (2 halfwords)
> nopr %r7
> # alignment for hotpatch
> .align 8
> t:
> # post-label NOPs for hotpatch (3 halfwords)
> .LFB0:
> st %r14,56(%r15)
> nop 0
> nopr %r7
> .LCFI0:
> l %r4,56(%r15)
> lhi %r2,0
> l %r14,56(%r15)
> .LCFI1:
Sorry, this testcase is invalid as I modified the compiler.
Martin
