From d0e2ffcca0ef6d526de8d221ba41567526b4cb40 Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Fri, 23 Oct 2020 12:11:15 +1030 Subject: [PATCH] [RS6000] altivec style lvx/stvx addresses vs power10 gcc.target/powerpc/fold-vec-st-pixel.c and other testcases fail on power10, generating addi 9,5,12 rldicr 9,9,0,59 stxv 34,0(9) rather than addi 5,5,12 stvx 2,0,5 for an altivec lvx/stvx style address. The problem starts with fwprop creating (insn 9 4 0 2 (set (mem:V8HI (and:DI (plus:DI (reg/v/f:DI 121 [ vpp ]) (const_int 12 [0xc])) (const_int -16 [0xfffffffffffffff0])) [0 MEM [(void *)_4 & -16B]+0 S16 A128]) (reg/v:V8HI 120 [ vp1 ])) "pixel.c":6:10 1237 {vsx_movv8hi_64bit} which is finally thrown out as invalid by lra. lra of course does that by reloading the entire address. fwprop creates the invalid address due to rs6000_legitimate_address_p trimming off the outer AND of altivec style addresses before applying other predicates. address_is_prefixed then allows the inner address. Now at the time the AND stripping was added (git commit 850e8d3d56d), rs6000_legitimate_address looked a lot simpler. This patch allows through just those addresses that were legitimate in those simpler days. * config/rs6000/rs6000.c (rs6000_legitimate_address_p): Limit AND addressing to just lvx/stvx style addresses. --- gcc/config/rs6000/rs6000.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index 4978e8b..4d528a3 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -9110,15 +9110,21 @@ rs6000_legitimate_address_p (machine_mode mode, rtx x, bool reg_ok_strict) bool reg_offset_p = reg_offset_addressing_ok_p (mode); bool quad_offset_p = mode_supports_dq_form (mode); - /* If this is an unaligned stvx/ldvx type address, discard the outer AND. */ + if (TARGET_ELF && RS6000_SYMBOL_REF_TLS_P (x)) + return 0; + + /* Handle unaligned altivec lvx/stvx type addresses. */ if (VECTOR_MEM_ALTIVEC_OR_VSX_P (mode) && GET_CODE (x) == AND && CONST_INT_P (XEXP (x, 1)) && INTVAL (XEXP (x, 1)) == -16) - x = XEXP (x, 0); + { + x = XEXP (x, 0); + return (legitimate_indirect_address_p (x, reg_ok_strict) + || legitimate_indexed_address_p (x, reg_ok_strict) + || virtual_stack_registers_memory_p (x)); + } - if (TARGET_ELF && RS6000_SYMBOL_REF_TLS_P (x)) - return 0; if (legitimate_indirect_address_p (x, reg_ok_strict)) return 1; if (TARGET_UPDATE -- 2.7.4