https://llvm.org/bugs/show_bug.cgi?id=28229
Bug ID: 28229
Summary: Consider using movw/movt for local symbols in position
independent code on ELF
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
Assignee: unassignedb...@nondot.org
Reporter: rafael.espind...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Given
@a = hidden global i32 42
define i32* @f() {
ret i32* @a
}
llc produces
movw r0, :lower16:(_a-(LPC0_0+8))
movt r0, :upper16:(_a-(LPC0_0+8))
LPC0_0:
add r0, pc, r0
When targeting MachO but
ldr r0, .LCPI0_0
.LPC0_0:
add r0, pc, r0
...
.LCPI0_0:
.long a-(.LPC0_0+8)
When targeting ELF.
ELF has PREL relocations for MOVW/MOVT, so it should be possible to use
movw/movt on ELF too.
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