openwrtv4/toolchain/gcc/patches/7.3.0/110-Fix-MIPS-PR-84790.patch
Felix Fietkau 16cec7ae67 toolchain/gcc: merge pending fix for miscompiled MIPS16 code issue (GCC PR 84790)
Signed-off-by: Felix Fietkau <nbd@nbd.name>
2018-03-12 12:19:07 +01:00

20 lines
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Diff

Fix https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84790.
MIPS16 functions have a static assembler prologue which clobbers
registers v0 and v1. Add these register clobbers to function call
instructions.
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -3098,6 +3098,12 @@ mips_emit_call_insn (rtx pattern, rtx or
emit_insn (gen_update_got_version ());
}
+ if (TARGET_MIPS16 && TARGET_USE_GOT)
+ {
+ clobber_reg (&CALL_INSN_FUNCTION_USAGE (insn), MIPS16_PIC_TEMP);
+ clobber_reg (&CALL_INSN_FUNCTION_USAGE (insn), MIPS_PROLOGUE_TEMP (word_mode));
+ }
+
if (TARGET_MIPS16
&& TARGET_EXPLICIT_RELOCS
&& TARGET_CALL_CLOBBERED_GP)