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File _service:tar_scm:LoongArch-Generate-bytepick.-wd-for-suitable-bit-ope.patch of Package gcc
From 9311c0f56086e38fe5e9bf4bbfc2e37d0f18347c Mon Sep 17 00:00:00 2001 From: Xi Ruoyao <xry111@xry111.site> Date: Fri, 3 Feb 2023 17:06:06 +0800 Subject: [PATCH 036/124] LoongArch: Generate bytepick.[wd] for suitable bit operation pattern We can use bytepick.[wd] for a << (8 * x) | b >> (8 * (sizeof(a) - x)) while a and b are uint32_t or uint64_t. This is useful for some cases, for example: https://sourceware.org/pipermail/libc-alpha/2023-February/145203.html gcc/ChangeLog: * config/loongarch/loongarch.md (bytepick_w_ashift_amount): New define_int_iterator. (bytepick_d_ashift_amount): Likewise. (bytepick_imm): New define_int_attr. (bytepick_w_lshiftrt_amount): Likewise. (bytepick_d_lshiftrt_amount): Likewise. (bytepick_w_<bytepick_imm>): New define_insn template. (bytepick_w_<bytepick_imm>_extend): Likewise. (bytepick_d_<bytepick_imm>): Likewise. (bytepick_w): Remove unused define_insn. (bytepick_d): Likewise. (UNSPEC_BYTEPICK_W): Remove unused unspec. (UNSPEC_BYTEPICK_D): Likewise. * config/loongarch/predicates.md (const_0_to_3_operand): Remove unused define_predicate. (const_0_to_7_operand): Likewise. gcc/testsuite/ChangeLog: * g++.target/loongarch/bytepick.C: New test. Signed-off-by: Peng Fan <fanpeng@loongson.cn> Signed-off-by: ticat_fp <fanpeng@loongson.cn> --- gcc/config/loongarch/loongarch.md | 60 ++++++++++++++----- gcc/config/loongarch/predicates.md | 8 --- gcc/testsuite/g++.target/loongarch/bytepick.C | 32 ++++++++++ 3 files changed, 77 insertions(+), 23 deletions(-) create mode 100644 gcc/testsuite/g++.target/loongarch/bytepick.C diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md index f61db66d5..833b94753 100644 --- a/gcc/config/loongarch/loongarch.md +++ b/gcc/config/loongarch/loongarch.md @@ -48,8 +48,6 @@ UNSPEC_EH_RETURN ;; Bit operation - UNSPEC_BYTEPICK_W - UNSPEC_BYTEPICK_D UNSPEC_BITREV_4B UNSPEC_BITREV_8B @@ -544,6 +542,27 @@ (UNSPEC_FTINTRM "0") (UNSPEC_FTINTRP "0")]) +;; Iterator and attributes for bytepick.d +(define_int_iterator bytepick_w_ashift_amount [8 16 24]) +(define_int_attr bytepick_w_lshiftrt_amount [(8 "24") + (16 "16") + (24 "8")]) +(define_int_iterator bytepick_d_ashift_amount [8 16 24 32 40 48 56]) +(define_int_attr bytepick_d_lshiftrt_amount [(8 "56") + (16 "48") + (24 "40") + (32 "32") + (40 "24") + (48 "16") + (56 "8")]) +(define_int_attr bytepick_imm [(8 "1") + (16 "2") + (24 "3") + (32 "4") + (40 "5") + (48 "6") + (56 "7")]) + ;; ;; .................... ;; @@ -3364,24 +3383,35 @@ [(set_attr "type" "unknown") (set_attr "mode" "<MODE>")]) -(define_insn "bytepick_w" +(define_insn "bytepick_w_<bytepick_imm>" [(set (match_operand:SI 0 "register_operand" "=r") - (unspec:SI [(match_operand:SI 1 "register_operand" "r") - (match_operand:SI 2 "register_operand" "r") - (match_operand:SI 3 "const_0_to_3_operand" "n")] - UNSPEC_BYTEPICK_W))] + (ior:SI (lshiftrt (match_operand:SI 1 "register_operand" "r") + (const_int <bytepick_w_lshiftrt_amount>)) + (ashift (match_operand:SI 2 "register_operand" "r") + (const_int bytepick_w_ashift_amount))))] "" - "bytepick.w\t%0,%1,%2,%z3" + "bytepick.w\t%0,%1,%2,<bytepick_imm>" [(set_attr "mode" "SI")]) -(define_insn "bytepick_d" +(define_insn "bytepick_w_<bytepick_imm>_extend" [(set (match_operand:DI 0 "register_operand" "=r") - (unspec:DI [(match_operand:DI 1 "register_operand" "r") - (match_operand:DI 2 "register_operand" "r") - (match_operand:DI 3 "const_0_to_7_operand" "n")] - UNSPEC_BYTEPICK_D))] - "" - "bytepick.d\t%0,%1,%2,%z3" + (sign_extend:DI + (ior:SI (lshiftrt (match_operand:SI 1 "register_operand" "r") + (const_int <bytepick_w_lshiftrt_amount>)) + (ashift (match_operand:SI 2 "register_operand" "r") + (const_int bytepick_w_ashift_amount)))))] + "TARGET_64BIT" + "bytepick.w\t%0,%1,%2,<bytepick_imm>" + [(set_attr "mode" "SI")]) + +(define_insn "bytepick_d_<bytepick_imm>" + [(set (match_operand:DI 0 "register_operand" "=r") + (ior:DI (lshiftrt (match_operand:DI 1 "register_operand" "r") + (const_int <bytepick_d_lshiftrt_amount>)) + (ashift (match_operand:DI 2 "register_operand" "r") + (const_int bytepick_d_ashift_amount))))] + "TARGET_64BIT" + "bytepick.d\t%0,%1,%2,<bytepick_imm>" [(set_attr "mode" "DI")]) (define_insn "bitrev_4b" diff --git a/gcc/config/loongarch/predicates.md b/gcc/config/loongarch/predicates.md index 58c3dc226..3c32b2987 100644 --- a/gcc/config/loongarch/predicates.md +++ b/gcc/config/loongarch/predicates.md @@ -91,14 +91,6 @@ (ior (match_operand 0 "const_1_operand") (match_operand 0 "register_operand"))) -(define_predicate "const_0_to_3_operand" - (and (match_code "const_int") - (match_test "IN_RANGE (INTVAL (op), 0, 3)"))) - -(define_predicate "const_0_to_7_operand" - (and (match_code "const_int") - (match_test "IN_RANGE (INTVAL (op), 0, 7)"))) - (define_predicate "lu52i_mask_operand" (and (match_code "const_int") (match_test "UINTVAL (op) == 0xfffffffffffff"))) diff --git a/gcc/testsuite/g++.target/loongarch/bytepick.C b/gcc/testsuite/g++.target/loongarch/bytepick.C new file mode 100644 index 000000000..a39e2fa65 --- /dev/null +++ b/gcc/testsuite/g++.target/loongarch/bytepick.C @@ -0,0 +1,32 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -mabi=lp64d" } */ +/* { dg-final { scan-assembler-times "bytepick.w\t\\\$r4,\\\$r5,\\\$r4" 3 } } */ +/* { dg-final { scan-assembler-times "bytepick.d\t\\\$r4,\\\$r5,\\\$r4" 7 } } */ +/* { dg-final { scan-assembler-not "slli.w" } } */ + +template <class T, int offs> +T +merge (T a, T b) +{ + return a << offs | b >> (8 * sizeof (T) - offs); +} + +using u32 = __UINT32_TYPE__; +using u64 = __UINT64_TYPE__; +using i64 = __INT64_TYPE__; + +template u32 merge<u32, 8> (u32, u32); +template u32 merge<u32, 16> (u32, u32); +template u32 merge<u32, 24> (u32, u32); + +template u64 merge<u64, 8> (u64, u64); +template u64 merge<u64, 16> (u64, u64); +template u64 merge<u64, 24> (u64, u64); +template u64 merge<u64, 32> (u64, u64); +template u64 merge<u64, 40> (u64, u64); +template u64 merge<u64, 48> (u64, u64); +template u64 merge<u64, 56> (u64, u64); + +/* we cannot use bytepick for the following cases */ +template i64 merge<i64, 8> (i64, i64); +template u64 merge<u64, 42> (u64, u64); -- 2.33.0
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