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authorJozef Lawrynowicz <jozef.l@mittosystems.com>2020-02-10 20:37:57 +0000
committerJozef Lawrynowicz <jozef.l@mittosystems.com>2020-02-10 20:42:36 +0000
commitac4280dad035bb98fba999c174314435aefdf1a0 (patch)
treed98902ac63fdef6da63bde52b4cebdff1b2ff70b /include/lto-symtab.h
parent8d6cb116f47b5edb2a7c2fa540fcb9dbcd3effc2 (diff)
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MSP430: Enable relaxation of jump instructions to hard-coded pcrel offsets
This patch fixes execution failures which occur when the BR in a sequence such as: J<cond> 1f BR 1: is relaxed to a JMP, and the pc-relative offset for the destination of the J<cond> instruction is hard-coded to be 2 words ahead of the instruction. The hard-coded offset will cause execution to jump 1 word ahead of where it should actually go. Instead we now detect the hard-coded offset is one we inserted earlier, and invert the condition, allowing us to remove the BR entirely. bfd/ChangeLog: 2020-02-10 Jozef Lawrynowicz <jozef.l@mittosystems.com> * elf32-msp430.c (msp430_elf_relax_section): Before relaxing a branch, check if previous instruction matches a conditional jump inserted earlier. Invert conditional jump and delete branch in this case.
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