With the code changes in the patch for PR target/85075, I noticed that the
PowerPC big-endian build stopped in building big endian, 32-bit libgcc when
configured for power8. The issue was this latent bug. Segher asked me to
re-submit the bug separately, and I'm doing this for PR target/85424.
This is the patch that I did in PR target/85075. For that set, I did bootstrap
builds for big endian power7 and little endian power8 (along with a previous
build on a big endian power8 system).
This patch will need to be back ported to GCC 7. I suspect that it may not be
needed in GCC 6, since that revision used RELOAD instead of LRA. But given it
is hard to replicate the bug, I will also back port it to GCC 6.
Can I apply this to GCC 8, and after a waiting period, apply it to GCC 7 and
GCC 6?
2018-04-15 Michael Meissner <meiss...@linux.vnet.ibm.com>
PR target/85424
* config/rs6000/rs6000.md (pack<mode>): Do not try handle a pack
where the inputs overlap with the output.
--
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meiss...@linux.vnet.ibm.com, phone: +1 (978) 899-4797
Index: gcc/config/rs6000/rs6000.md
===================================================================
--- gcc/config/rs6000/rs6000.md (revision 259376)
+++ gcc/config/rs6000/rs6000.md (working copy)
@@ -13934,16 +13934,14 @@ (define_insn_and_split "unpack<mode>_nod
(set_attr "length" "4")])
(define_insn_and_split "pack<mode>"
- [(set (match_operand:FMOVE128 0 "register_operand" "=d,&d")
+ [(set (match_operand:FMOVE128 0 "register_operand" "=&d")
(unspec:FMOVE128
- [(match_operand:<FP128_64> 1 "register_operand" "0,d")
- (match_operand:<FP128_64> 2 "register_operand" "d,d")]
+ [(match_operand:<FP128_64> 1 "register_operand" "d")
+ (match_operand:<FP128_64> 2 "register_operand" "d")]
UNSPEC_PACK_128BIT))]
"FLOAT128_2REG_P (<MODE>mode)"
- "@
- fmr %L0,%2
- #"
- "&& reload_completed && REGNO (operands[0]) != REGNO (operands[1])"
+ "#"
+ "&& reload_completed"
[(set (match_dup 3) (match_dup 1))
(set (match_dup 4) (match_dup 2))]
{
@@ -13956,8 +13954,8 @@ (define_insn_and_split "pack<mode>"
operands[3] = gen_rtx_REG (<FP128_64>mode, dest_hi);
operands[4] = gen_rtx_REG (<FP128_64>mode, dest_lo);
}
- [(set_attr "type" "fpsimple,fp")
- (set_attr "length" "4,8")])
+ [(set_attr "type" "fp")
+ (set_attr "length" "8")])
(define_insn "unpack<mode>"
[(set (match_operand:DI 0 "register_operand" "=wa,wa")
