[PATCH,ARM] Fix PR55019 Incorrectly use live argument register to save high register in thumb1 prologue

Mon, 22 Oct 2012 04:50:42 -0700 

Hi,

Attached patch intends to fix bug 55019 which is exposed on 4.7 branch.
Although this bug can't be reproduced on trunk, I think this fix is still
useful to make trunk more robust. Tested with trunk regression test on
cortex-m0 and cortex-m3, no regression found. Also tested with various
benchmark like Dhrystone/coremark/eembc_v1 on cortex-m0, no regression on
performance and code size. Is it ok to go upstream and 4.7 branch?

BR,
Terry

gcc/ChangeLog

2012-10-22  Terry Guo  <terry....@arm.com>

        PR target/55019
        * config/arm/arm.c (thumb1_expand_prologue): Don't push high regs
with
        live argument regs.

gcc/testsuite/ChangeLog

2012-10-22  Terry Guo  <terry....@arm.com>

        PR target/55019
        * gcc.target/arm/pr55019.c: New.

Attachment: thumb1-argument-register-issue.patch
Description: Binary data

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