The fallback part of HARD_REGNO_CALLER_SAVE_MODE, choose_hard_reg_mode,
returns DFmode for SImode when TARGET_E500_DOUBLE. This confuses
lra when attempting to save ctr around a call.
Arseny, the bug reporter, has regression tested this patch.
OK to apply?
PR target/71680
* config/rs6000/rs6000.h (HARD_REGNO_CALLER_SAVE_MODE): Return
SImode for TARGET_E500_DOUBLE when given SImode.
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index af77258..353f388 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -1273,6 +1273,8 @@ enum data_align { align_abi, align_opt, align_both };
&& ((MODE) == VOIDmode || ALTIVEC_OR_VSX_VECTOR_MODE (MODE))
\
&& FP_REGNO_P (REGNO) \
? V2DFmode \
+ : TARGET_E500_DOUBLE && (MODE) == SImode \
+ ? SImode \
: TARGET_E500_DOUBLE && ((MODE) == VOIDmode || (MODE) == DFmode) \
? DFmode \
: !TARGET_E500_DOUBLE && FLOAT128_IBM_P (MODE) && FP_REGNO_P (REGNO)
\
--
Alan Modra
Australia Development Lab, IBM
