diff --git a/gcc/builtins.c b/gcc/builtins.c
index e1b284846b1..f78a36478ef 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -6584,24 +6584,11 @@ expand_builtin_strncpy (tree exp, rtx target)
    previous iteration.  */
 
 rtx
-builtin_memset_read_str (void *data, void *prevp,
+builtin_memset_read_str (void *data, void *prev,
 			 HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
 			 scalar_int_mode mode)
 {
-  by_pieces_prev *prev = (by_pieces_prev *) prevp;
-  if (prev != nullptr && prev->data != nullptr)
-    {
-      /* Use the previous data in the same mode.  */
-      if (prev->mode == mode)
-	return prev->data;
-    }
-
-  const char *c = (const char *) data;
-  char *p = XALLOCAVEC (char, GET_MODE_SIZE (mode));
-
-  memset (p, *c, GET_MODE_SIZE (mode));
-
-  return c_readstr (p, mode);
+  return targetm.read_memset_value ((const char *) data, prev, mode);
 }
 
 /* Callback routine for store_by_pieces.  Return the RTL of a register
@@ -6611,37 +6598,11 @@ builtin_memset_read_str (void *data, void *prevp,
    nullptr, it has the RTL info from the previous iteration.  */
 
 static rtx
-builtin_memset_gen_str (void *data, void *prevp,
+builtin_memset_gen_str (void *data, void *prev,
 			HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
 			scalar_int_mode mode)
 {
-  rtx target, coeff;
-  size_t size;
-  char *p;
-
-  by_pieces_prev *prev = (by_pieces_prev *) prevp;
-  if (prev != nullptr && prev->data != nullptr)
-    {
-      /* Use the previous data in the same mode.  */
-      if (prev->mode == mode)
-	return prev->data;
-
-      target = simplify_gen_subreg (mode, prev->data, prev->mode, 0);
-      if (target != nullptr)
-	return target;
-    }
-
-  size = GET_MODE_SIZE (mode);
-  if (size == 1)
-    return (rtx) data;
-
-  p = XALLOCAVEC (char, size);
-  memset (p, 1, size);
-  coeff = c_readstr (p, mode);
-
-  target = convert_to_mode (mode, (rtx) data, 1);
-  target = expand_mult (mode, target, coeff, NULL_RTX, 1);
-  return force_reg (mode, target);
+  return targetm.gen_memset_value ((rtx) data, prev, mode);
 }
 
 /* Expand expression EXP, which is a call to the memset builtin.  Return
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 85ea9395560..51385044e76 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -11868,6 +11868,22 @@ This function prepares to emit a conditional comparison within a sequence
  @var{bit_code} is @code{AND} or @code{IOR}, which is the op on the compares.
 @end deftypefn
 
+@deftypefn {Target Hook} rtx TARGET_READ_MEMSET_VALUE (const char *@var{c}, void *@var{prev}, scalar_int_mode @var{mode})
+This function returns the RTL of a constant integer corresponding to
+target reading @code{GET_MODE_SIZE (@var{mode})} bytes from the stringn
+constant @var{str}.  If @var{prev} is not @samp{nullptr}, it contains
+the RTL information from the previous interation.
+@end deftypefn
+
+@deftypefn {Target Hook} rtx TARGET_GEN_MEMSET_VALUE (rtx @var{data}, void *@var{prev}, scalar_int_mode @var{mode})
+This function returns the RTL of a register containing
+@code{GET_MODE_SIZE (@var{mode})} consecutive copies of the unsigned
+char value given in the RTL register @var{data}.  For example, if
+@var{mode} is 4 bytes wide, return the RTL for 0x01010101*@var{data}.
+If @var{PREV} is not @samp{nullptr}, it is the RTL information from
+the previous iteration.
+@end deftypefn
+
 @deftypefn {Target Hook} unsigned TARGET_LOOP_UNROLL_ADJUST (unsigned @var{nunroll}, class loop *@var{loop})
 This target hook returns a new value for the number of times @var{loop}
 should be unrolled. The parameter @var{nunroll} is the number of times
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index d8e3de14af1..8d4c3949fbf 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -7956,6 +7956,10 @@ lists.
 
 @hook TARGET_GEN_CCMP_NEXT
 
+@hook TARGET_READ_MEMSET_VALUE
+
+@hook TARGET_GEN_MEMSET_VALUE
+
 @hook TARGET_LOOP_UNROLL_ADJUST
 
 @defmac POWI_MAX_MULTS
diff --git a/gcc/target.def b/gcc/target.def
index bbaf6b4f3a0..c9aca40fa88 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -2694,6 +2694,26 @@ DEFHOOK
  rtx, (rtx_insn **prep_seq, rtx_insn **gen_seq, rtx prev, int cmp_code, tree op0, tree op1, int bit_code),
  NULL)
 
+DEFHOOK
+(read_memset_value,
+ "This function returns the RTL of a constant integer corresponding to\n\
+target reading @code{GET_MODE_SIZE (@var{mode})} bytes from the stringn\n\
+constant @var{str}.  If @var{prev} is not @samp{nullptr}, it contains\n\
+the RTL information from the previous interation.",
+ rtx, (const char *c, void *prev, scalar_int_mode mode),
+ default_read_memset_value)
+
+DEFHOOK
+(gen_memset_value,
+ "This function returns the RTL of a register containing\n\
+@code{GET_MODE_SIZE (@var{mode})} consecutive copies of the unsigned\n\
+char value given in the RTL register @var{data}.  For example, if\n\
+@var{mode} is 4 bytes wide, return the RTL for 0x01010101*@var{data}.\n\
+If @var{PREV} is not @samp{nullptr}, it is the RTL information from\n\
+the previous iteration.",
+ rtx, (rtx data, void *prev, scalar_int_mode mode),
+ default_gen_memset_value)
+
 /* Return a new value for loop unroll size.  */
 DEFHOOK
 (loop_unroll_adjust,
diff --git a/gcc/targhooks.c b/gcc/targhooks.c
index 1947ef26fd6..b55e6ec6756 100644
--- a/gcc/targhooks.c
+++ b/gcc/targhooks.c
@@ -90,6 +90,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "attribs.h"
 #include "asan.h"
 #include "emit-rtl.h"
+#include "builtins.h"
 
 bool
 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED,
@@ -2627,4 +2628,59 @@ default_memtag_untagged_pointer (rtx tagged_pointer, rtx target)
   return untagged_base;
 }
 
+/* Default implementation of TARGET_READ_MEMSET_VALUE.  */
+
+rtx
+default_read_memset_value (const char *c, void *prevp,
+			   scalar_int_mode mode)
+{
+  by_pieces_prev *prev = (by_pieces_prev *) prevp;
+  if (prev != nullptr && prev->data != nullptr)
+    {
+      /* Use the previous data in the same mode.  */
+      if (prev->mode == mode)
+	return prev->data;
+    }
+
+  char *p = XALLOCAVEC (char, GET_MODE_SIZE (mode));
+
+  memset (p, *c, GET_MODE_SIZE (mode));
+
+  return c_readstr (p, mode);
+}
+
+/* Default implementation of TARGET_GEN_MEMSET_VALUE.  */
+
+rtx
+default_gen_memset_value (rtx data, void *prevp, scalar_int_mode mode)
+{
+  rtx target, coeff;
+  size_t size;
+  char *p;
+
+  by_pieces_prev *prev = (by_pieces_prev *) prevp;
+  if (prev != nullptr && prev->data != nullptr)
+    {
+      /* Use the previous data in the same mode.  */
+      if (prev->mode == mode)
+	return prev->data;
+
+      target = simplify_gen_subreg (mode, prev->data, prev->mode, 0);
+      if (target != nullptr)
+	return target;
+    }
+
+  size = GET_MODE_SIZE (mode);
+  if (size == 1)
+    return data;
+
+  p = XALLOCAVEC (char, size);
+  memset (p, 1, size);
+  coeff = c_readstr (p, mode);
+
+  target = convert_to_mode (mode, data, 1);
+  target = expand_mult (mode, target, coeff, NULL_RTX, 1);
+  return force_reg (mode, target);
+}
+
 #include "gt-targhooks.h"
diff --git a/gcc/targhooks.h b/gcc/targhooks.h
index b537038c0aa..3c00927e196 100644
--- a/gcc/targhooks.h
+++ b/gcc/targhooks.h
@@ -300,4 +300,8 @@ extern rtx default_memtag_set_tag (rtx, rtx, rtx);
 extern rtx default_memtag_extract_tag (rtx, rtx);
 extern rtx default_memtag_untagged_pointer (rtx, rtx);
 
+extern rtx default_read_memset_value (const char *, void *,
+				      scalar_int_mode);
+extern rtx default_gen_memset_value (rtx, void *, scalar_int_mode);
+
 #endif /* GCC_TARGHOOKS_H */
