From: Wilco Dijkstra Date: Wed, 7 Dec 2016 14:44:45 +0000 (+0000) Subject: Improve TI mode address offsets - these may either use LDP of 64-bit or LDR of 128... X-Git-Tag: basepoints/gcc-8~2485 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8734dfacbbd841ccf1fb9682a631896013442807;p=thirdparty%2Fgcc.git Improve TI mode address offsets - these may either use LDP of 64-bit or LDR of 128-bit... Improve TI mode address offsets - these may either use LDP of 64-bit or LDR of 128-bit, so we need to use the correct intersection of offsets. When splitting a large offset into base and offset, use a signed 9-bit unscaled offset. Remove the Ump constraint on movti and movtf instructions as this blocks the reload optimizer from merging address CSEs (is this supposed to work only on 'm' constraints?). The result is improved codesize, especially wrf and gamess in SPEC2006. gcc/ * config/aarch64/aarch64.md (movti_aarch64): Change Ump to m. (movtf_aarch64): Likewise. * config/aarch64/aarch64.c (aarch64_classify_address): Use correct intersection of offsets. (aarch64_legitimize_address_displacement): Use 9-bit signed offsets. (aarch64_legitimize_address): Use 9-bit signed offsets for TI/TF mode. Use 7-bit signed scaled mode for modes > 16 bytes. From-SVN: r243346 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index fbe5bbedc954..c1b8784ce9d0 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,13 @@ +2016-12-07 Wilco Dijkstra + + * config/aarch64/aarch64.md (movti_aarch64): Change Ump to m. + (movtf_aarch64): Likewise. + * config/aarch64/aarch64.c (aarch64_classify_address): + Use correct intersection of offsets. + (aarch64_legitimize_address_displacement): Use 9-bit signed offsets. + (aarch64_legitimize_address): Use 9-bit signed offsets for TI/TF mode. + Use 7-bit signed scaled mode for modes > 16 bytes. + 2016-12-07 James Greenhalgh PR rtl-optimization/78561 diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index dab46b59693d..128f32bda238 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -4330,7 +4330,8 @@ aarch64_classify_address (struct aarch64_address_info *info, instruction memory accesses. */ if (mode == TImode || mode == TFmode) return (aarch64_offset_7bit_signed_scaled_p (DImode, offset) - && offset_9bit_signed_unscaled_p (mode, offset)); + && (offset_9bit_signed_unscaled_p (mode, offset) + || offset_12bit_unsigned_scaled_p (mode, offset))); /* A 7bit offset check because OImode will emit a ldp/stp instruction (only big endian will get here). @@ -4534,18 +4535,19 @@ aarch64_legitimate_address_p (machine_mode mode, rtx x, /* Split an out-of-range address displacement into a base and offset. Use 4KB range for 1- and 2-byte accesses and a 16KB range otherwise to increase opportunities for sharing the base address of different sizes. - For TI/TFmode and unaligned accesses use a 256-byte range. */ + For unaligned accesses and TI/TF mode use the signed 9-bit range. */ static bool aarch64_legitimize_address_displacement (rtx *disp, rtx *off, machine_mode mode) { - HOST_WIDE_INT mask = GET_MODE_SIZE (mode) < 4 ? 0xfff : 0x3fff; + HOST_WIDE_INT offset = INTVAL (*disp); + HOST_WIDE_INT base = offset & ~(GET_MODE_SIZE (mode) < 4 ? 0xfff : 0x3ffc); - if (mode == TImode || mode == TFmode || - (INTVAL (*disp) & (GET_MODE_SIZE (mode) - 1)) != 0) - mask = 0xff; + if (mode == TImode || mode == TFmode + || (offset & (GET_MODE_SIZE (mode) - 1)) != 0) + base = (offset + 0x100) & ~0x1ff; - *off = GEN_INT (INTVAL (*disp) & ~mask); - *disp = GEN_INT (INTVAL (*disp) & mask); + *off = GEN_INT (base); + *disp = GEN_INT (offset - base); return true; } @@ -5412,12 +5414,10 @@ aarch64_legitimize_address (rtx x, rtx /* orig_x */, machine_mode mode) x = gen_rtx_PLUS (Pmode, base, offset_rtx); } - /* Does it look like we'll need a load/store-pair operation? */ + /* Does it look like we'll need a 16-byte load/store-pair operation? */ HOST_WIDE_INT base_offset; - if (GET_MODE_SIZE (mode) > 16 - || mode == TImode) - base_offset = ((offset + 64 * GET_MODE_SIZE (mode)) - & ~((128 * GET_MODE_SIZE (mode)) - 1)); + if (GET_MODE_SIZE (mode) > 16) + base_offset = (offset + 0x400) & ~0x7f0; /* For offsets aren't a multiple of the access size, the limit is -256...255. */ else if (offset & (GET_MODE_SIZE (mode) - 1)) @@ -5431,6 +5431,8 @@ aarch64_legitimize_address (rtx x, rtx /* orig_x */, machine_mode mode) /* Small negative offsets are supported. */ else if (IN_RANGE (offset, -256, 0)) base_offset = 0; + else if (mode == TImode || mode == TFmode) + base_offset = (offset + 0x100) & ~0x1ff; /* Use 12-bit offset by access size. */ else base_offset = offset & (~0xfff * GET_MODE_SIZE (mode)); diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md index 1e6b6f5ba7cd..811a0785e7df 100644 --- a/gcc/config/aarch64/aarch64.md +++ b/gcc/config/aarch64/aarch64.md @@ -1120,9 +1120,9 @@ (define_insn "*movti_aarch64" [(set (match_operand:TI 0 - "nonimmediate_operand" "=r, *w,r ,*w,r ,Ump,Ump,*w,m") + "nonimmediate_operand" "=r, *w,r ,*w,r,m,m,*w,m") (match_operand:TI 1 - "aarch64_movti_operand" " rn,r ,*w,*w,Ump,r ,Z , m,*w"))] + "aarch64_movti_operand" " rn,r ,*w,*w,m,r,Z, m,*w"))] "(register_operand (operands[0], TImode) || aarch64_reg_or_zero (operands[1], TImode))" "@ @@ -1237,9 +1237,9 @@ (define_insn "*movtf_aarch64" [(set (match_operand:TF 0 - "nonimmediate_operand" "=w,?&r,w ,?r,w,?w,w,m,?r ,Ump,Ump") + "nonimmediate_operand" "=w,?&r,w ,?r,w,?w,w,m,?r,m ,m") (match_operand:TF 1 - "general_operand" " w,?r, ?r,w ,Y,Y ,m,w,Ump,?r ,Y"))] + "general_operand" " w,?r, ?r,w ,Y,Y ,m,w,m ,?r,Y"))] "TARGET_FLOAT && (register_operand (operands[0], TFmode) || aarch64_reg_or_fp_zero (operands[1], TFmode))" "@