https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106691
Bug ID: 106691
Summary: Section anchors is not implemented for riscv
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Target: riscv
Take:
static int a, b;
int f(void)
{
return a+b;
}
void g(int c, int d)
{
a = c;
b = d;
}
--- CUT ---
Right now riscv32-linux-gnu produces:
f:
lui a5,%hi(a)
lw a0,%lo(a)(a5)
lui a5,%hi(b)
lw a5,%lo(b)(a5)
add a0,a0,a5
ret
g:
lui a5,%hi(a)
sw a0,%lo(a)(a5)
lui a5,%hi(b)
sw a1,%lo(b)(a5)
ret
While aarch64 produces:
f:
adrp x0, .LANCHOR0
add x2, x0, :lo12:.LANCHOR0
ldr w1, [x0, #:lo12:.LANCHOR0]
ldr w0, [x2, 4]
add w0, w1, w0
ret
g:
adrp x2, .LANCHOR0
add x3, x2, :lo12:.LANCHOR0
str w0, [x2, #:lo12:.LANCHOR0]
str w1, [x3, 4]
ret
One less instruction.
