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| author | Tom de Vries <tom@codesourcery.com> | 2014-12-02 13:35:10 +0000 |
|---|---|---|
| committer | Tom de Vries <vries@gcc.gnu.org> | 2014-12-02 13:35:10 +0000 |
| commit | fb98f8869b20ecc3ee1f6cb473ab6d7b3c34ece7 (patch) | |
| tree | d740a6ef24472cc788d1ae6549262f7ea9cfa7ad /gcc | |
| parent | e3376050fc1981c8510a720291569c6abaf4e2ef (diff) | |
| download | gcc-fb98f8869b20ecc3ee1f6cb473ab6d7b3c34ece7.zip gcc-fb98f8869b20ecc3ee1f6cb473ab6d7b3c34ece7.tar.gz gcc-fb98f8869b20ecc3ee1f6cb473ab6d7b3c34ece7.tar.bz2 | |
re PR rtl-optimization/63718 (ARM Thumb1 bootstrap fail after fuse-caller-save info in cprop-hardreg)
2014-12-02 Tom de Vries <tom@codesourcery.com>
PR rtl-optimization/63718
* config/arm/arm.c (arm_option_override): Disable fuse-caller-save for
Thumb1.
From-SVN: r218271
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/arm/arm.c | 12 |
2 files changed, 18 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2bf3bce..3eacc5a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2014-12-02 Tom de Vries <tom@codesourcery.com> + + PR rtl-optimization/63718 + * config/arm/arm.c (arm_option_override): Disable fuse-caller-save for + Thumb1. + 2014-12-02 Richard Biener <rguenther@suse.de> * match.pd: When combining divisions exclude the degenerate diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index c40c3bd..f3be6cf 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -3105,6 +3105,18 @@ arm_option_override (void) && (!arm_arch7 || !current_tune->prefer_ldrd_strd)) flag_schedule_fusion = 0; + /* In Thumb1 mode, we emit the epilogue in RTL, but the last insn + - epilogue_insns - does not accurately model the corresponding insns + emitted in the asm file. In particular, see the comment in thumb_exit + 'Find out how many of the (return) argument registers we can corrupt'. + As a consequence, the epilogue may clobber registers without + fuse-caller-save finding out about it. Therefore, disable fuse-caller-save + in Thumb1 mode. + TODO: Accurately model clobbers for epilogue_insns and reenable + fuse-caller-save. */ + if (TARGET_THUMB1) + flag_use_caller_save = 0; + /* Register global variables with the garbage collector. */ arm_add_gc_roots (); } |