llvm-project/llvm/test/MC/ARM/modified-immediate-fixup.s

@ PR24346
@ RUN: llvm-mc < %s -triple=arm-linux-gnueabi -filetype=obj -o - \
@ RUN: | llvm-objdump --disassemble -arch=arm - | FileCheck %s

    .data
    .align 8
L2:
    .word 0
    .align 8
    .word 0
L1:

    .text
@ CHECK: add r0, r0, #260
    add r0, r0, #(L1 - L2)
Fix for pr24346: arm asm label calculation error in sub Some ARM instructions encode 32-bit immediates as a 8-bit integer (0-255) and a 4-bit rotation (0-30, even) in its least significant 12 bits. The original fixup, FK_Data_4, patches the instruction by the value bit-to-bit, regardless of the encoding. For example, assuming the label L1 and L2 are 0x0 and 0x104 respectively, the following instruction: add r0, r0, #(L2 - L1) ; expects 0x104, i.e., 260 would be assembled to the following, which adds 1 to r0, instead of 260: e2800104 add r0, r0, #4, 2 ; equivalently 1 The new fixup kind fixup_arm_mod_imm takes care of the encoding: e2800f41 add r0, r0, #260 Patch by Ting-Yuan Huang! llvm-svn: 265122 2016-04-01 17:40:47 +08:00			`@ PR24346`
			`@ RUN: llvm-mc < %s -triple=arm-linux-gnueabi -filetype=obj -o - \`
			`@ RUN: \| llvm-objdump --disassemble -arch=arm - \| FileCheck %s`

			`.data`
			`.align 8`
			`L2:`
			`.word 0`
			`.align 8`
			`.word 0`
			`L1:`

			`.text`
			`@ CHECK: add r0, r0, #260`
			`add r0, r0, #(L1 - L2)`