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llvm-project/llvm/test/MC/ARM/ltorg-range.s

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Re-apply r302416: [ARM] Clear the constant pool cache on explicit .ltorg directives Re-applying now that PR32825 which was raised on the commit this fixed up is now known to have also been fixed by this commit. Original commit message: Multiple ldr pseudoinstructions with the same constant value will reuse the same constant pool entry. However, if the constant pool is explicitly flushed with a .ltorg directive, we should not try to reference constants in the previous pool any longer, since they may be out of range. This fixes assembling hand-written assembler source which repeatedly loads the same constant value, across a binary size larger than the pc-relative fixup range for ldr instructions (4096 bytes). Such assembler source already uses explicit .ltorg instructions to emit constant pools with regular intervals. However if we try to reuse constants emitted in earlier pools, they end up out of range. This makes the output of the testcase match what binutils gas does (prior to this patch, it would fail to assemble). Differential Revision: https://reviews.llvm.org/D32847 llvm-svn: 303540
2017-05-22 17:42:07 +08:00
@ RUN: llvm-mc -triple armv7-unknown-linux-gnueabi -filetype obj -o - %s \
@ RUN: | llvm-objdump -d - | FileCheck %s
ldr r0, =0x01020304
@ CHECK: ldr
.ltorg
@ CHECK: 0x01020304
ldr r0, =0x01020304
ldr r0, =0x01020304
ldr r0, =0x01020304
@ CHECK: ldr
@ CHECK: ldr
@ CHECK: ldr
.ltorg
@ CHECK: 0x01020304
.rep 1028
.word 0
.endr
@ CHECK: 0x00000000
ldr r0, =0x01020304
@ CHECK: ldr
.ltorg
@ CHECK: 0x01020304
.rep 1028
.word 0
.endr