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-rw-r--r--gcc/loop-iv.c100
1 files changed, 61 insertions, 39 deletions
diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c
index 32d5e87..cdcd303 100644
--- a/gcc/loop-iv.c
+++ b/gcc/loop-iv.c
@@ -112,6 +112,22 @@ static htab_t bivs;
static bool iv_analyze_op (rtx, rtx, struct rtx_iv *);
+/* Return the RTX code corresponding to the IV extend code EXTEND. */
+static inline enum rtx_code
+iv_extend_to_rtx_code (enum iv_extend_code extend)
+{
+ switch (extend)
+ {
+ case IV_SIGN_EXTEND:
+ return SIGN_EXTEND;
+ case IV_ZERO_EXTEND:
+ return ZERO_EXTEND;
+ case IV_UNKNOWN_EXTEND:
+ return UNKNOWN;
+ }
+ gcc_unreachable ();
+}
+
/* Dumps information about IV to FILE. */
extern void dump_iv_info (FILE *, struct rtx_iv *);
@@ -139,7 +155,7 @@ dump_iv_info (FILE *file, struct rtx_iv *iv)
if (iv->mode != iv->extend_mode)
fprintf (file, " %s to %s",
- rtx_name[iv->extend],
+ rtx_name[iv_extend_to_rtx_code (iv->extend)],
GET_MODE_NAME (iv->extend_mode));
if (iv->mult != const1_rtx)
@@ -390,7 +406,7 @@ iv_constant (struct rtx_iv *iv, rtx cst, enum machine_mode mode)
iv->base = cst;
iv->step = const0_rtx;
iv->first_special = false;
- iv->extend = UNKNOWN;
+ iv->extend = IV_UNKNOWN_EXTEND;
iv->extend_mode = iv->mode;
iv->delta = const0_rtx;
iv->mult = const1_rtx;
@@ -411,7 +427,7 @@ iv_subreg (struct rtx_iv *iv, enum machine_mode mode)
val = lowpart_subreg (mode, val, iv->extend_mode);
iv->base = val;
- iv->extend = UNKNOWN;
+ iv->extend = IV_UNKNOWN_EXTEND;
iv->mode = iv->extend_mode = mode;
iv->delta = const0_rtx;
iv->mult = const1_rtx;
@@ -424,7 +440,7 @@ iv_subreg (struct rtx_iv *iv, enum machine_mode mode)
if (GET_MODE_BITSIZE (mode) > GET_MODE_BITSIZE (iv->mode))
return false;
- iv->extend = UNKNOWN;
+ iv->extend = IV_UNKNOWN_EXTEND;
iv->mode = mode;
iv->base = simplify_gen_binary (PLUS, iv->extend_mode, iv->delta,
@@ -441,17 +457,17 @@ iv_subreg (struct rtx_iv *iv, enum machine_mode mode)
/* Evaluates application of EXTEND to MODE on IV. */
static bool
-iv_extend (struct rtx_iv *iv, enum rtx_code extend, enum machine_mode mode)
+iv_extend (struct rtx_iv *iv, enum iv_extend_code extend, enum machine_mode mode)
{
/* If iv is invariant, just calculate the new value. */
if (iv->step == const0_rtx
&& !iv->first_special)
{
rtx val = get_iv_value (iv, const0_rtx);
- val = simplify_gen_unary (extend, mode, val, iv->extend_mode);
-
+ val = simplify_gen_unary (iv_extend_to_rtx_code (extend), mode,
+ val, iv->extend_mode);
iv->base = val;
- iv->extend = UNKNOWN;
+ iv->extend = IV_UNKNOWN_EXTEND;
iv->mode = iv->extend_mode = mode;
iv->delta = const0_rtx;
iv->mult = const1_rtx;
@@ -461,7 +477,7 @@ iv_extend (struct rtx_iv *iv, enum rtx_code extend, enum machine_mode mode)
if (mode != iv->extend_mode)
return false;
- if (iv->extend != UNKNOWN
+ if (iv->extend != IV_UNKNOWN_EXTEND
&& iv->extend != extend)
return false;
@@ -475,7 +491,7 @@ iv_extend (struct rtx_iv *iv, enum rtx_code extend, enum machine_mode mode)
static bool
iv_neg (struct rtx_iv *iv)
{
- if (iv->extend == UNKNOWN)
+ if (iv->extend == IV_UNKNOWN_EXTEND)
{
iv->base = simplify_gen_unary (NEG, iv->extend_mode,
iv->base, iv->extend_mode);
@@ -502,7 +518,7 @@ iv_add (struct rtx_iv *iv0, struct rtx_iv *iv1, enum rtx_code op)
rtx arg;
/* Extend the constant to extend_mode of the other operand if necessary. */
- if (iv0->extend == UNKNOWN
+ if (iv0->extend == IV_UNKNOWN_EXTEND
&& iv0->mode == iv0->extend_mode
&& iv0->step == const0_rtx
&& GET_MODE_SIZE (iv0->extend_mode) < GET_MODE_SIZE (iv1->extend_mode))
@@ -511,7 +527,7 @@ iv_add (struct rtx_iv *iv0, struct rtx_iv *iv1, enum rtx_code op)
iv0->base = simplify_gen_unary (ZERO_EXTEND, iv0->extend_mode,
iv0->base, iv0->mode);
}
- if (iv1->extend == UNKNOWN
+ if (iv1->extend == IV_UNKNOWN_EXTEND
&& iv1->mode == iv1->extend_mode
&& iv1->step == const0_rtx
&& GET_MODE_SIZE (iv1->extend_mode) < GET_MODE_SIZE (iv0->extend_mode))
@@ -525,7 +541,8 @@ iv_add (struct rtx_iv *iv0, struct rtx_iv *iv1, enum rtx_code op)
if (mode != iv1->extend_mode)
return false;
- if (iv0->extend == UNKNOWN && iv1->extend == UNKNOWN)
+ if (iv0->extend == IV_UNKNOWN_EXTEND
+ && iv1->extend == IV_UNKNOWN_EXTEND)
{
if (iv0->mode != iv1->mode)
return false;
@@ -537,7 +554,7 @@ iv_add (struct rtx_iv *iv0, struct rtx_iv *iv1, enum rtx_code op)
}
/* Handle addition of constant. */
- if (iv1->extend == UNKNOWN
+ if (iv1->extend == IV_UNKNOWN_EXTEND
&& iv1->mode == mode
&& iv1->step == const0_rtx)
{
@@ -545,7 +562,7 @@ iv_add (struct rtx_iv *iv0, struct rtx_iv *iv1, enum rtx_code op)
return true;
}
- if (iv0->extend == UNKNOWN
+ if (iv0->extend == IV_UNKNOWN_EXTEND
&& iv0->mode == mode
&& iv0->step == const0_rtx)
{
@@ -573,7 +590,7 @@ iv_mult (struct rtx_iv *iv, rtx mby)
&& GET_MODE (mby) != mode)
return false;
- if (iv->extend == UNKNOWN)
+ if (iv->extend == IV_UNKNOWN_EXTEND)
{
iv->base = simplify_gen_binary (MULT, mode, iv->base, mby);
iv->step = simplify_gen_binary (MULT, mode, iv->step, mby);
@@ -598,7 +615,7 @@ iv_shift (struct rtx_iv *iv, rtx mby)
&& GET_MODE (mby) != mode)
return false;
- if (iv->extend == UNKNOWN)
+ if (iv->extend == IV_UNKNOWN_EXTEND)
{
iv->base = simplify_gen_binary (ASHIFT, mode, iv->base, mby);
iv->step = simplify_gen_binary (ASHIFT, mode, iv->step, mby);
@@ -619,7 +636,7 @@ iv_shift (struct rtx_iv *iv, rtx mby)
static bool
get_biv_step_1 (df_ref def, rtx reg,
rtx *inner_step, enum machine_mode *inner_mode,
- enum rtx_code *extend, enum machine_mode outer_mode,
+ enum iv_extend_code *extend, enum machine_mode outer_mode,
rtx *outer_step)
{
rtx set, rhs, op0 = NULL_RTX, op1 = NULL_RTX;
@@ -719,7 +736,7 @@ get_biv_step_1 (df_ref def, rtx reg,
return false;
*inner_step = const0_rtx;
- *extend = UNKNOWN;
+ *extend = IV_UNKNOWN_EXTEND;
*inner_mode = outer_mode;
*outer_step = const0_rtx;
}
@@ -739,7 +756,7 @@ get_biv_step_1 (df_ref def, rtx reg,
*inner_step = simplify_gen_binary (PLUS, outer_mode,
*inner_step, *outer_step);
*outer_step = const0_rtx;
- *extend = UNKNOWN;
+ *extend = IV_UNKNOWN_EXTEND;
}
switch (code)
@@ -763,10 +780,10 @@ get_biv_step_1 (df_ref def, rtx reg,
case SIGN_EXTEND:
case ZERO_EXTEND:
gcc_assert (GET_MODE (op0) == *inner_mode
- && *extend == UNKNOWN
+ && *extend == IV_UNKNOWN_EXTEND
&& *outer_step == const0_rtx);
- *extend = code;
+ *extend = (code == SIGN_EXTEND) ? IV_SIGN_EXTEND : IV_ZERO_EXTEND;
break;
default:
@@ -785,7 +802,7 @@ get_biv_step_1 (df_ref def, rtx reg,
static bool
get_biv_step (df_ref last_def, rtx reg, rtx *inner_step,
- enum machine_mode *inner_mode, enum rtx_code *extend,
+ enum machine_mode *inner_mode, enum iv_extend_code *extend,
enum machine_mode *outer_mode, rtx *outer_step)
{
*outer_mode = GET_MODE (reg);
@@ -795,7 +812,7 @@ get_biv_step (df_ref last_def, rtx reg, rtx *inner_step,
outer_step))
return false;
- gcc_assert ((*inner_mode == *outer_mode) != (*extend != UNKNOWN));
+ gcc_assert ((*inner_mode == *outer_mode) != (*extend != IV_UNKNOWN_EXTEND));
gcc_assert (*inner_mode != *outer_mode || *outer_step == const0_rtx);
return true;
@@ -849,7 +866,7 @@ iv_analyze_biv (rtx def, struct rtx_iv *iv)
{
rtx inner_step, outer_step;
enum machine_mode inner_mode, outer_mode;
- enum rtx_code extend;
+ enum iv_extend_code extend;
df_ref last_def;
if (dump_file)
@@ -1006,8 +1023,12 @@ iv_analyze_expr (rtx insn, rtx rhs, enum machine_mode mode, struct rtx_iv *iv)
switch (code)
{
case SIGN_EXTEND:
+ if (!iv_extend (&iv0, IV_SIGN_EXTEND, mode))
+ return false;
+ break;
+
case ZERO_EXTEND:
- if (!iv_extend (&iv0, code, mode))
+ if (!iv_extend (&iv0, IV_ZERO_EXTEND, mode))
return false;
break;
@@ -1249,10 +1270,11 @@ get_iv_value (struct rtx_iv *iv, rtx iteration)
val = lowpart_subreg (iv->mode, val, iv->extend_mode);
- if (iv->extend == UNKNOWN)
+ if (iv->extend == IV_UNKNOWN_EXTEND)
return val;
- val = simplify_gen_unary (iv->extend, iv->extend_mode, val, iv->mode);
+ val = simplify_gen_unary (iv_extend_to_rtx_code (iv->extend),
+ iv->extend_mode, val, iv->mode);
val = simplify_gen_binary (PLUS, iv->extend_mode, iv->delta,
simplify_gen_binary (MULT, iv->extend_mode,
iv->mult, val));
@@ -2071,7 +2093,7 @@ shorten_into_mode (struct rtx_iv *iv, enum machine_mode mode,
}
iv->mode = mode;
- iv->extend = signed_p ? SIGN_EXTEND : ZERO_EXTEND;
+ iv->extend = signed_p ? IV_SIGN_EXTEND : IV_ZERO_EXTEND;
}
/* Transforms IV0 and IV1 compared by COND so that they are both compared as
@@ -2097,31 +2119,31 @@ canonicalize_iv_subregs (struct rtx_iv *iv0, struct rtx_iv *iv1,
{
case LE:
case LT:
- if (iv0->extend == ZERO_EXTEND
- || iv1->extend == ZERO_EXTEND)
+ if (iv0->extend == IV_ZERO_EXTEND
+ || iv1->extend == IV_ZERO_EXTEND)
return false;
signed_p = true;
break;
case LEU:
case LTU:
- if (iv0->extend == SIGN_EXTEND
- || iv1->extend == SIGN_EXTEND)
+ if (iv0->extend == IV_SIGN_EXTEND
+ || iv1->extend == IV_SIGN_EXTEND)
return false;
signed_p = false;
break;
case NE:
- if (iv0->extend != UNKNOWN
- && iv1->extend != UNKNOWN
+ if (iv0->extend != IV_UNKNOWN_EXTEND
+ && iv1->extend != IV_UNKNOWN_EXTEND
&& iv0->extend != iv1->extend)
return false;
signed_p = false;
- if (iv0->extend != UNKNOWN)
- signed_p = iv0->extend == SIGN_EXTEND;
- if (iv1->extend != UNKNOWN)
- signed_p = iv1->extend == SIGN_EXTEND;
+ if (iv0->extend != IV_UNKNOWN_EXTEND)
+ signed_p = iv0->extend == IV_SIGN_EXTEND;
+ if (iv1->extend != IV_UNKNOWN_EXTEND)
+ signed_p = iv1->extend == IV_SIGN_EXTEND;
break;
default:
generated by cgit v1.1 at 2025-05-30 09:14:16 +0000