gcc: xtensa: Backport patches from upstream/master (v3)

patches/gcc10.1/gcc-xtensa-0078-fix-PR-target-108919.patch

@@ -0,0 +1,184 @@
+From 15990e92b92f65aa5951d1f53d39d15cbde6c0cd Mon Sep 17 00:00:00 2001
+From: Max Filippov <[email protected]>
+Date: Wed, 22 Feb 2023 14:17:11 -0800
+Subject: [PATCH] gcc: xtensa: fix PR target/108919
+
+gcc/
+	PR target/108919
+
+	* config/xtensa/xtensa-protos.h
+	(xtensa_prepare_expand_call): Rename to xtensa_expand_call.
+	* config/xtensa/xtensa.c (xtensa_prepare_expand_call): Rename
+	to xtensa_expand_call.
+	(xtensa_expand_call): Emit the call and add a clobber expression
+	for the static chain to it in case of windowed ABI.
+	* config/xtensa/xtensa.md (call, call_value, sibcall)
+	(sibcall_value): Call xtensa_expand_call and complete expansion
+	right after that call.
+
+gcc/testsuite/
+	* gcc.target/xtensa/pr108919.c: New test.
+---
+ gcc/config/xtensa/xtensa-protos.h          |  2 +-
+ gcc/config/xtensa/xtensa.c                 | 25 +++++++++++-
+ gcc/config/xtensa/xtensa.md                | 12 ++++--
+ gcc/testsuite/gcc.target/xtensa/pr108919.c | 46 ++++++++++++++++++++++
+ 4 files changed, 79 insertions(+), 6 deletions(-)
+ create mode 100644 gcc/testsuite/gcc.target/xtensa/pr108919.c
+
+diff --git a/gcc/config/xtensa/xtensa-protos.h b/gcc/config/xtensa/xtensa-protos.h
+index 39d5a5825..74a5d93a0 100644
+--- a/gcc/config/xtensa/xtensa-protos.h
++++ b/gcc/config/xtensa/xtensa-protos.h
+@@ -53,7 +53,7 @@ extern void xtensa_expand_atomic (enum rtx_code, rtx, rtx, rtx, bool);
+ extern void xtensa_emit_loop_end (rtx_insn *, rtx *);
+ extern char *xtensa_emit_branch (bool, rtx *);
+ extern char *xtensa_emit_movcc (bool, bool, bool, rtx *);
+-extern void xtensa_prepare_expand_call (int, rtx *);
++extern void xtensa_expand_call (int, rtx *);
+ extern char *xtensa_emit_call (int, rtx *);
+ extern char *xtensa_emit_sibcall (int, rtx *);
+ extern bool xtensa_tls_referenced_p (rtx);
+diff --git a/gcc/config/xtensa/xtensa.c b/gcc/config/xtensa/xtensa.c
+index 6aea625d9..1e0820d4f 100644
+--- a/gcc/config/xtensa/xtensa.c
++++ b/gcc/config/xtensa/xtensa.c
+@@ -2173,8 +2173,10 @@ xtensa_emit_movcc (bool inverted, bool isfp, bool isbool, rtx *operands)
+
+
+ void
+-xtensa_prepare_expand_call (int callop, rtx *operands)
++xtensa_expand_call (int callop, rtx *operands)
+ {
++  rtx call;
++  rtx_insn *call_insn;
+   rtx addr = XEXP (operands[callop], 0);
+
+   if (flag_pic && SYMBOL_REF_P (addr)
+@@ -2192,6 +2194,27 @@ xtensa_prepare_expand_call (int callop, rtx *operands)
+ 				 Pmode);
+       XEXP (operands[callop], 0) = reg;
+     }
++
++  call = gen_rtx_CALL (VOIDmode, operands[callop], operands[callop + 1]);
++
++  if (callop)
++    call = gen_rtx_SET (operands[0], call);
++
++  call_insn = emit_call_insn (call);
++
++  if (TARGET_WINDOWED_ABI)
++    {
++      /*
++       * Windowed xtensa ABI specifies that static chain pointer is passed
++       * in memory below the caller's stack pointer, which means that the
++       * callee may clobber it if it's a non-leaf function.
++       * Add the clobber expression for the static chain to the function call
++       * expression list so that it is not assumed to be live across the call.
++       */
++      rtx clob = gen_rtx_CLOBBER (Pmode, xtensa_static_chain (NULL, false));
++      CALL_INSN_FUNCTION_USAGE (call_insn) =
++	gen_rtx_EXPR_LIST (Pmode, clob, CALL_INSN_FUNCTION_USAGE (call_insn));
++    }
+ }
+
+
+diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
+index 628b27b32..30e4022ca 100644
+--- a/gcc/config/xtensa/xtensa.md
++++ b/gcc/config/xtensa/xtensa.md
+@@ -2338,7 +2338,8 @@
+ 	 (match_operand 1 "" ""))]
+   ""
+ {
+-  xtensa_prepare_expand_call (0, operands);
++  xtensa_expand_call (0, operands);
++  DONE;
+ })
+
+ (define_insn "call_internal"
+@@ -2358,7 +2359,8 @@
+ 	      (match_operand 2 "" "")))]
+   ""
+ {
+-  xtensa_prepare_expand_call (1, operands);
++  xtensa_expand_call (1, operands);
++  DONE;
+ })
+
+ (define_insn "call_value_internal"
+@@ -2378,7 +2380,8 @@
+ 	 (match_operand 1 "" ""))]
+   "!TARGET_WINDOWED_ABI"
+ {
+-  xtensa_prepare_expand_call (0, operands);
++  xtensa_expand_call (0, operands);
++  DONE;
+ })
+
+ (define_insn "sibcall_internal"
+@@ -2398,7 +2401,8 @@
+ 	      (match_operand 2 "" "")))]
+   "!TARGET_WINDOWED_ABI"
+ {
+-  xtensa_prepare_expand_call (1, operands);
++  xtensa_expand_call (1, operands);
++  DONE;
+ })
+
+ (define_insn "sibcall_value_internal"
+diff --git a/gcc/testsuite/gcc.target/xtensa/pr108919.c b/gcc/testsuite/gcc.target/xtensa/pr108919.c
+new file mode 100644
+index 000000000..300b6fd10
+--- /dev/null
++++ b/gcc/testsuite/gcc.target/xtensa/pr108919.c
+@@ -0,0 +1,46 @@
++/* { dg-do run } */
++/* { dg-options "-O2" } */
++
++
++#ifdef __XTENSA_CALL0_ABI__
++void __xtensa_libgcc_window_spill (void)
++{
++}
++#else
++void __xtensa_libgcc_window_spill (void);
++#endif
++
++__attribute__((noinline)) void h (void)
++{
++  __xtensa_libgcc_window_spill ();
++}
++
++int f (int u, int v)
++{
++  int a = u;
++  int s;
++
++  __attribute__((noinline,pure)) int nested1 (int b)
++  {
++      h();
++      return a + b;
++  }
++
++  __attribute__((noinline,pure)) int nested2 (int b)
++  {
++      h();
++      return a - b;
++  }
++
++  s = nested1 (v);
++  s += nested2 (v);
++  return s;
++}
++
++int main (void)
++{
++  int u = 0x12345678;
++  int v = 1;
++
++  return f (u, v) == 2 * u ? 0 : 1;
++}
+-- 
+2.30.2
+

patches/gcc10.1/gcc-xtensa-0079-Make-use-of-CLAMPS-instruction-if-configured.patch

@@ -0,0 +1,136 @@
+From e0a5a834dc034c239ae7f319d0287fb24db13744 Mon Sep 17 00:00:00 2001
+From: Takayuki 'January June' Suwa <[email protected]>
+Date: Mon, 27 Feb 2023 02:27:42 +0900
+Subject: [PATCH] xtensa: Make use of CLAMPS instruction if configured
+
+This patch introduces the use of CLAMPS instruction when the instruction
+is configured.
+
+    /* example */
+    int test(int a) {
+      if (a < -512)
+        return -512;
+      if (a > 511)
+        return 511;
+      return a;
+    }
+
+    ;; prereq: TARGET_CLAMPS
+    test:
+	clamps	a2, a2, 9
+	ret.n
+
+gcc/ChangeLog:
+
+	* config/xtensa/xtensa-protos.h (xtensa_match_CLAMPS_imms_p):
+	New prototype.
+	* config/xtensa/xtensa.c (xtensa_match_CLAMPS_imms_p):
+	New function.
+	* config/xtensa/xtensa.h (TARGET_CLAMPS): New macro definition.
+	* config/xtensa/xtensa.md (*xtensa_clamps): New insn pattern.
+---
+ gcc/config/xtensa/xtensa-protos.h |  1 +
+ gcc/config/xtensa/xtensa.c        | 13 +++++++++++
+ gcc/config/xtensa/xtensa.h        |  1 +
+ gcc/config/xtensa/xtensa.md       | 37 +++++++++++++++++++++++++++++++
+ 4 files changed, 52 insertions(+)
+
+diff --git a/gcc/config/xtensa/xtensa-protos.h b/gcc/config/xtensa/xtensa-protos.h
+index 74a5d93a0..59e5cd1bb 100644
+--- a/gcc/config/xtensa/xtensa-protos.h
++++ b/gcc/config/xtensa/xtensa-protos.h
+@@ -60,6 +60,7 @@ extern bool xtensa_tls_referenced_p (rtx);
+ extern enum rtx_code xtensa_shlrd_which_direction (rtx, rtx);
+ extern bool xtensa_split1_finished_p (void);
+ extern void xtensa_split_DI_reg_imm (rtx *);
++extern bool xtensa_match_CLAMPS_imms_p (rtx, rtx);
+
+ #ifdef TREE_CODE
+ extern void init_cumulative_args (CUMULATIVE_ARGS *, int);
+diff --git a/gcc/config/xtensa/xtensa.c b/gcc/config/xtensa/xtensa.c
+index 1e0820d4f..a62665d6b 100644
+--- a/gcc/config/xtensa/xtensa.c
++++ b/gcc/config/xtensa/xtensa.c
+@@ -2602,6 +2602,19 @@ xtensa_emit_add_imm (rtx dst, rtx src, HOST_WIDE_INT imm, rtx scratch,
+ }
+
+
++/* Return true if the constants used in the application of smin() following
++   smax() meet the specifications of the CLAMPS machine instruction.  */
++bool
++xtensa_match_CLAMPS_imms_p (rtx cst_max, rtx cst_min)
++{
++  int max, min;
++
++  return IN_RANGE (max = exact_log2 (-INTVAL (cst_max)), 7, 22)
++	 && IN_RANGE (min = exact_log2 (INTVAL (cst_min) + 1), 7, 22)
++	 && max == min;
++}
++
++
+ /* Implement TARGET_CANNOT_FORCE_CONST_MEM.  */
+
+ static bool
+diff --git a/gcc/config/xtensa/xtensa.h b/gcc/config/xtensa/xtensa.h
+index ef7f9e5d5..19d35f20a 100644
+--- a/gcc/config/xtensa/xtensa.h
++++ b/gcc/config/xtensa/xtensa.h
+@@ -50,6 +50,7 @@ along with GCC; see the file COPYING3.  If not see
+ #define TARGET_NSA		XCHAL_HAVE_NSA
+ #define TARGET_MINMAX		XCHAL_HAVE_MINMAX
+ #define TARGET_SEXT		XCHAL_HAVE_SEXT
++#define TARGET_CLAMPS		XCHAL_HAVE_CLAMPS
+ #define TARGET_BOOLEANS		XCHAL_HAVE_BOOLEANS
+ #define TARGET_HARD_FLOAT	XCHAL_HAVE_FP
+ #define TARGET_HARD_FLOAT_DIV	XCHAL_HAVE_FP_DIV
+diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
+index 30e4022ca..8fd3e006a 100644
+--- a/gcc/config/xtensa/xtensa.md
++++ b/gcc/config/xtensa/xtensa.md
+@@ -446,6 +446,43 @@
+    (set_attr "mode"	"SI")
+    (set_attr "length"	"3")])
+
++
++;; Signed clamp.
++
++(define_insn_and_split "*xtensa_clamps"
++  [(set (match_operand:SI 0 "register_operand" "=a")
++	(smax:SI (smin:SI (match_operand:SI 1 "register_operand" "r")
++			  (match_operand:SI 2 "const_int_operand" "i"))
++		 (match_operand:SI 3 "const_int_operand" "i")))]
++  "TARGET_CLAMPS
++   && xtensa_match_CLAMPS_imms_p (operands[3], operands[2])"
++  "#"
++  "&& 1"
++  [(set (match_dup 0)
++	(smin:SI (smax:SI (match_dup 1)
++			  (match_dup 3))
++		 (match_dup 2)))]
++  ""
++  [(set_attr "type"	"arith")
++   (set_attr "mode"	"SI")
++   (set_attr "length"	"3")])
++
++(define_insn "*xtensa_clamps"
++  [(set (match_operand:SI 0 "register_operand" "=a")
++	(smin:SI (smax:SI (match_operand:SI 1 "register_operand" "r")
++			  (match_operand:SI 2 "const_int_operand" "i"))
++		 (match_operand:SI 3 "const_int_operand" "i")))]
++  "TARGET_CLAMPS
++   && xtensa_match_CLAMPS_imms_p (operands[2], operands[3])"
++{
++  static char result[64];
++  sprintf (result, "clamps\t%%0, %%1, %d", floor_log2 (-INTVAL (operands[2])));
++  return result;
++}
++  [(set_attr "type"	"arith")
++   (set_attr "mode"	"SI")
++   (set_attr "length"	"3")])
++
+
+ ;; Count redundant leading sign bits and leading/trailing zeros,
+ ;; and find first bit.
+-- 
+2.30.2
+

patches/gcc10.1/gcc-xtensa-0080-Remove-REG_OK_STRICT-and-its-derivatives.patch

@@ -0,0 +1,44 @@
+From f90cf6b4d8328a771cff1db3078ab2062cf95085 Mon Sep 17 00:00:00 2001
+From: Takayuki 'January June' Suwa <[email protected]>
+Date: Sun, 12 Mar 2023 23:14:13 +0900
+Subject: [PATCH] xtensa: Remove REG_OK_STRICT and its derivatives
+
+Because GO_IF_LEGITIMATE_ADDRESS was deprecated a long time ago
+(see commit c6c3dba931548987c78719180e30ebc863404b89).
+
+gcc/ChangeLog:
+
+	* config/xtensa/xtensa.h (REG_OK_STRICT, REG_OK_FOR_INDEX_P,
+	REG_OK_FOR_BASE_P): Remove.
+---
+ gcc/config/xtensa/xtensa.h | 11 +----------
+ 1 file changed, 1 insertion(+), 10 deletions(-)
+
+diff --git a/gcc/config/xtensa/xtensa.h b/gcc/config/xtensa/xtensa.h
+index 19d35f20a..fb06b6141 100644
+--- a/gcc/config/xtensa/xtensa.h
++++ b/gcc/config/xtensa/xtensa.h
+@@ -591,19 +591,10 @@ typedef struct xtensa_args
+ /* C expressions that are nonzero if X (assumed to be a `reg' RTX) is
+    valid for use as a base or index register.  */
+
+-#ifdef REG_OK_STRICT
+-#define REG_OK_STRICT_FLAG 1
+-#else
+-#define REG_OK_STRICT_FLAG 0
+-#endif
+-
+ #define BASE_REG_P(X, STRICT)						\
+-  ((!(STRICT) && REGNO (X) >= FIRST_PSEUDO_REGISTER)			\
++  ((!(STRICT) && ! HARD_REGISTER_P (X))					\
+    || REGNO_OK_FOR_BASE_P (REGNO (X)))
+
+-#define REG_OK_FOR_INDEX_P(X) 0
+-#define REG_OK_FOR_BASE_P(X) BASE_REG_P (X, REG_OK_STRICT_FLAG)
+-
+ /* Maximum number of registers that can appear in a valid memory address.  */
+ #define MAX_REGS_PER_ADDRESS 1
+
+-- 
+2.30.2
+