https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88521
--- Comment #8 from mateuszb at poczta dot onet.pl ---
My proposition is:
Index: gcc/config/i386/i386.c
===================================================================
--- gcc/config/i386/i386.c (revision 267245)
+++ gcc/config/i386/i386.c (working copy)
@@ -9063,6 +9063,13 @@
&& !COMPLEX_MODE_P (mode))
regno = FIRST_SSE_REG;
break;
+ case 8:
+ case 4:
+ if (valtype != NULL_TREE && AGGREGATE_TYPE_P (valtype))
+ break;
+ if (mode == SFmode || mode == DFmode)
+ regno = FIRST_SSE_REG;
+ break;
default:
break;
}
which gives:
$ cat t.c
float fun1(void)
{
return 4.14f;
}
typedef struct {float x;} Float;
Float fun2(void)
{
Float v;
v.x = 4.14f;
return v;
}
Mateusz@Mateusz-i7 /c/temp
$ gcc -c -O2 -o t.o t.c
Mateusz@Mateusz-i7 /c/temp
$ objdump -dr t.o
t.o: file format pe-x86-64
Disassembly of section .text:
0000000000000000 <fun1>:
0: f3 0f 10 05 00 00 00 movss 0x0(%rip),%xmm0 # 8 <fun1+0x8>
7: 00
4: R_X86_64_PC32 .rdata
8: c3 retq
9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
0000000000000010 <fun2>:
10: 8b 05 00 00 00 00 mov 0x0(%rip),%eax # 16 <fun2+0x6>
12: R_X86_64_PC32 .rdata
16: c3 retq
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
