[{"id":3683217,"web_url":"http://patchwork.ozlabs.org/comment/3683217/","msgid":"","list_archive_url":null,"date":"2026-04-28T08:00:29","subject":"Re: [PATCH v2] match.pd: x != CST1 ? x + CST2 : CST3 -> x + CST2\n [PR112659, PR122996]","submitter":{"id":91428,"url":"http://patchwork.ozlabs.org/api/people/91428/","name":"Andrew Pinski","email":"andrew.pinski@oss.qualcomm.com"},"content":"On Mon, Apr 27, 2026 at 4:01 PM Netanel Komm wrote:\n>\n> This patch extends the conditional addition simplification introduced\n> in PR 122996 to handle a third constant and uniform vectors. This also\n> resolves the missing vector addition fold noted in PR 112659.\n>\n> It simplifies x != CST1 ? x + CST2 : CST3 into x + CST2 when\n> CST1 + CST2 == CST3.\n>\n> Bootstrapped and regression tested on x86_64-pc-linux-gnu.\n>\n> PR tree-optimization/112659\n> PR tree-optimization/122996\n>\n> gcc/ChangeLog:\n>\n> * match.pd: Extend conditional addition pattern to handle\n> a third constant and uniform vectors.\n>\n> gcc/testsuite/ChangeLog:\n>\n> * g++.dg/tree-ssa/cond-add-vec-1.C: New test (positive cases).\n> * g++.dg/tree-ssa/cond-add-vec-2.C: New test (negative cases).\n> * gcc.dg/tree-ssa/cond-add-1.c: New test (positive cases).\n> * gcc.dg/tree-ssa/cond-add-2.c: New test (negative cases).\n> ---\n> Changes in v2:\n> - Checked for a vector conditional expression in forwprop1 instead of optimized\n> to avoid architecture specific differences caused by the vector lowering pass.\n> - Split the test files into positive and negative files.\n> - Added another negative test case for the scalar version.\n>\n> gcc/match.pd | 19 +++++++---\n> .../g++.dg/tree-ssa/cond-add-vec-1.C | 36 +++++++++++++++++++\n> .../g++.dg/tree-ssa/cond-add-vec-2.C | 20 +++++++++++\n> gcc/testsuite/gcc.dg/tree-ssa/cond-add-1.c | 24 +++++++++++++\n> gcc/testsuite/gcc.dg/tree-ssa/cond-add-2.c | 11 ++++++\n> 5 files changed, 105 insertions(+), 5 deletions(-)\n> create mode 100644 gcc/testsuite/g++.dg/tree-ssa/cond-add-vec-1.C\n> create mode 100644 gcc/testsuite/g++.dg/tree-ssa/cond-add-vec-2.C\n> create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/cond-add-1.c\n> create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/cond-add-2.c\n>\n> diff --git a/gcc/match.pd b/gcc/match.pd\n> index cb3a558a07d..8cdb6ddcba3 100644\n> --- a/gcc/match.pd\n> +++ b/gcc/match.pd\n> @@ -5251,11 +5251,20 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)\n> && expr_no_side_effects_p (@1))\n> @2)))\n>\n> -/* x != CST1 ? x + CST2 : 0 -> x + CST2 when CST1 == -CST2. */\n> -(simplify\n> - (cond (ne @0 INTEGER_CST@2) (plus@1 @0 INTEGER_CST@3) integer_zerop)\n> - (if (wi::to_wide (@2) == -wi::to_wide (@3))\n> - @1))\n> +/* x != CST1 ? x + CST2 : CST3 -> x + CST2 when CST1 + CST2 == CST3.\n> + * This handles both scalars and uniform vectors. */\n\nSmall formating nit, no * there. And two spaces after the `.` before the `*/`.\n\n> +(for cnd (cond vec_cond)\n> + (simplify\n> + (cnd (ne @0 uniform_integer_cst_p@1)\n> + (plus@2 @0 uniform_integer_cst_p@3)\n> + uniform_integer_cst_p@4)\n> + (with {\n> + tree cst1 = uniform_integer_cst_p (@1);\n> + tree cst2 = uniform_integer_cst_p (@3);\n> + tree cst3 = uniform_integer_cst_p (@4);\n> + }\n> + (if (wi::to_wide (cst1) + wi::to_wide (cst2) == wi::to_wide (cst3))\n> + @2))))\n>\n> /* Simplifications of shift and rotates. */\n>\n> diff --git a/gcc/testsuite/g++.dg/tree-ssa/cond-add-vec-1.C b/gcc/testsuite/g++.dg/tree-ssa/cond-add-vec-1.C\n> new file mode 100644\n> index 00000000000..3faed2a91bb\n> --- /dev/null\n> +++ b/gcc/testsuite/g++.dg/tree-ssa/cond-add-vec-1.C\n> @@ -0,0 +1,36 @@\n> +/* { dg-do compile } */\n> +/* { dg-options \"-O2 -fdump-tree-forwprop1\" } */\n\nThis test needs now -Wno-psabi.\n\n> +\n> +#define vector4 __attribute__((vector_size(4*sizeof(int))))\n> +#define vector4_u8 __attribute__((vector_size(4*sizeof(unsigned char))))\n> +#define vector4_u32 __attribute__((vector_size(4*sizeof(unsigned int))))\n> +#define vector2_u64 __attribute__((vector_size(2*sizeof(unsigned long))))\n> +\n> +void unopt(vector4 int *v) {\n> + vector4 int t = *v;\n> + vector4 int t1 = t + 8;\n> + *v = (t != -8) ? (t1) : (vector4 int){0, 0, 0, 0};\n> +}\n> +\n> +vector2_u64 unsigned long f1 (vector2_u64 unsigned long x) {\n> + return x != (vector2_u64 unsigned long){5, 5}\n> + ? x + (vector2_u64 unsigned long){10, 10}\n> + : (vector2_u64 unsigned long){15, 15};\n> +}\n> +\n> +vector4_u32 unsigned int f2 (vector4_u32 unsigned int x)\n> +{\n> + return x != (vector4_u32 unsigned int){20, 20, 20, 20}\n> + ? x - (vector4_u32 unsigned int){5, 5, 5, 5}\n> + : (vector4_u32 unsigned int){15, 15, 15, 15};\n> +}\n> +\n> +vector4_u8 unsigned char\n> +f3 (vector4_u8 unsigned char x)\n> +{\n> + return x != (vector4_u8 unsigned char){100, 100, 100, 100}\n> + ? x + (vector4_u8 unsigned char){166, 166, 166, 166}\n> + : (vector4_u8 unsigned char){10, 10, 10, 10};\n> +}\n> +\n> +/* { dg-final { scan-tree-dump-not \"VEC_COND_EXPR\" \"forwprop1\" } } */\n> diff --git a/gcc/testsuite/g++.dg/tree-ssa/cond-add-vec-2.C b/gcc/testsuite/g++.dg/tree-ssa/cond-add-vec-2.C\n> new file mode 100644\n> index 00000000000..5da12183327\n> --- /dev/null\n> +++ b/gcc/testsuite/g++.dg/tree-ssa/cond-add-vec-2.C\n> @@ -0,0 +1,20 @@\n> +/* { dg-do compile } */\n> +/* { dg-options \"-O2 -fdump-tree-forwprop1\" } */\nLikewise.\n\nOtherwise ok.\nI pushed this with the small update to these 2 testcases and the comment fix.\n\nThanks,\nAndrea\n\n> +\n> +#define vector4 __attribute__((vector_size(4*sizeof(int))))\n> +#define vector2_u64 __attribute__((vector_size(2*sizeof(unsigned long))))\n> +\n> +vector4 int g1 (vector4 int x) {\n> + vector4 int cst1 = {5, 1};\n> + vector4 int cst2 = {10, 2};\n> + vector4 int cst3 = {15, 3};\n> + return x != cst1 ? x + cst2 : cst3;\n> +}\n> +\n> +vector2_u64 unsigned long g2 (vector2_u64 unsigned long x) {\n> + return x != (vector2_u64 unsigned long){10, 10}\n> + ? x + (vector2_u64 unsigned long){20, 20}\n> + : (vector2_u64 unsigned long){40, 40};\n> +}\n> +\n> +/* { dg-final { scan-tree-dump-times \"VEC_COND_EXPR\" 2 \"forwprop1\" } } */\n> diff --git a/gcc/testsuite/gcc.dg/tree-ssa/cond-add-1.c b/gcc/testsuite/gcc.dg/tree-ssa/cond-add-1.c\n> new file mode 100644\n> index 00000000000..e4e4fc8db3e\n> --- /dev/null\n> +++ b/gcc/testsuite/gcc.dg/tree-ssa/cond-add-1.c\n> @@ -0,0 +1,24 @@\n> +/* { dg-do compile } */\n> +/* { dg-options \"-O2 -fdump-tree-optimized\" } */\n> +\n> +typedef unsigned char u8;\n> +typedef unsigned short u16;\n> +typedef unsigned int u32;\n> +typedef unsigned long u64;\n> +\n> +u64 f1 (u64 x) { return x != 5 ? x + 10 : 15; }\n> +\n> +u32 f2 (u32 x) { return x != 20 ? x - 5 : 15; }\n> +\n> +u16 f3 (u16 x) { return x == 100 ? 150 : x + 50; }\n> +\n> +u8 f4 (u8 x) { return x != 250 ? x + 2 : 252; }\n> +\n> +u8 f5 (u8 x) {\n> + if (x == 100)\n> + return 10;\n> + else\n> + return x + 166;\n> +}\n> +\n> +/* { dg-final { scan-tree-dump-not \"if \" \"optimized\" } } */\n> diff --git a/gcc/testsuite/gcc.dg/tree-ssa/cond-add-2.c b/gcc/testsuite/gcc.dg/tree-ssa/cond-add-2.c\n> new file mode 100644\n> index 00000000000..c855ec36556\n> --- /dev/null\n> +++ b/gcc/testsuite/gcc.dg/tree-ssa/cond-add-2.c\n> @@ -0,0 +1,11 @@\n> +/* { dg-do compile } */\n> +/* { dg-options \"-O2 -fdump-tree-optimized\" } */\n> +\n> +typedef unsigned int u32;\n> +typedef unsigned long u64;\n> +\n> +u64 g1 (u64 x) { return x != 10 ? x + 20 : 40; }\n> +\n> +u32 g2 (u32 x) { return x == 100 ? 10 : x + 166; }\n> +\n> +/* { dg-final { scan-tree-dump-times \"if \" 2 \"optimized\" } } */\n> --\n> 2.30.2\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=SjOkPZJK;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=FJvV5GzB;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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