d7e089f2d6
In ARM mode, passing -mtp=cp15 forces the use of an inline MRC system register read to move the thread pointer value into a register. Currently, in Thumb2 mode, -mtp=cp15 is ignored, and a call to the __aeabi_read_tp helper is emitted instead. This is inconsistent, and breaks the Linux/ARM build for Thumb2 targets, as the Linux kernel does not provide an implementation of __aeabi_read_tp,. Reviewed By: nickdesaulniers, peter.smith Differential Revision: https://reviews.llvm.org/D112600
17 lines
606 B
LLVM
17 lines
606 B
LLVM
; RUN: llc -mtriple arm-linux-gnueabi -o - %s | FileCheck %s -check-prefix=CHECK-SOFT
|
|
; RUN: llc -mtriple arm-linux-gnueabi -mattr=+read-tp-hard -o - %s | FileCheck %s -check-prefix=CHECK-HARD
|
|
; RUN: llc -mtriple thumbv7-linux-gnueabi -o - %s | FileCheck %s -check-prefix=CHECK-SOFT
|
|
; RUN: llc -mtriple thumbv7-linux-gnueabi -mattr=+read-tp-hard -o - %s | FileCheck %s -check-prefix=CHECK-HARD
|
|
|
|
declare i8* @llvm.thread.pointer()
|
|
|
|
define i8* @test() {
|
|
entry:
|
|
%tmp1 = call i8* @llvm.thread.pointer()
|
|
ret i8* %tmp1
|
|
}
|
|
|
|
; CHECK-SOFT: bl __aeabi_read_tp
|
|
; CHECK-HARD: mrc p15, #0, {{r[0-9]+}}, c13, c0, #3
|
|
|