asavonic added inline comments.
================
Comment at: clang/test/Sema/x86-no-x87.c:2
+// RUN: %clang_cc1 -fsyntax-only -verify %s -triple x86_64-linux-gnu
-target-feature -x87
+// RUN: %clang_cc1 -fsyntax-only -verify %s -triple i686-linux-gnu
-target-feature -x87
+// RUN: %clang_cc1 -fsyntax-only -verify %s -triple x86_64-windows-msvc
-target-feature -x87 -DNOERROR
----------------
pengfei wrote:
> Should i686 expect no error like GCC?
GCC seems to fallback to soft-float for i686 if -mno-80387 is used:
long double orig(long double x, long double y)
{
long double z = x + y;
if (z < 0.0)
return z;
else
return 0.0;
}
i686-linux-gnu-gcc-8 -c -S -mno-80387 -O3:
call __addxf3@PLT
[...]
call __ltxf2@PLT
addl $32, %esp
testl %eax, %eax
js .L3
xorl %esi, %esi
xorl %edi, %edi
xorl %ebp, %ebp
.L3:
addl $12, %esp
movl %esi, %eax
movl %edi, %edx
movl %ebp, %ecx
popl %ebx
popl %esi
popl %edi
popl %ebp
ret
This looks like a different ABI.
X87 instructions are not used, so no error is reported.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D98895/new/
https://reviews.llvm.org/D98895
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