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opcodes/cgen: Rework calculation of shift when inserting fields

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The calculation of the shift amount, used to insert fields into the
instruction buffer, is not correct when the following conditions are all
true:
  - CGEN_INT_INSN_P is defined, and true.
  - CGEN_INSN_LSB0_P is true
  - Total instruction length is greater than the length of a single
    instruction word (the instruction is made of multiple words)
  - The word offset is non-zero (the field is outside the first word)

When the above conditions are all true, the calculated shift fails to
take account of the total instruction length.

After this commit the calculation of the shift amount is split into two
parts, first we calculate the shift required to get to BIT0 of the word
in which the field lives, then we calculate the shift required to place
the field within the instruction word.

The change in this commit only effects the CGEN_INT_INSN_P defined true
case, but changes the code for both CGEN_INSN_LSB0_P true, and false.

In the case of CGEN_INSN_LSB0_P being false, the code used to say:

	shift = total_length - (word_offset + start + length);

Now it says:

	shift_to_word = total_length - (word_offset + word_length);
	shift_within_word = word_length - start - length;
	shift = shift_to_word + shift_within_word;

From which we can see that in all cases the computed shift value should
be unchanged.

In the case of CGEN_INSN_LSB0_P being true, the code used to say:

	shift = (word_offset + start + 1) - length;

Now it says:

	shift_to_word = total_length - (word_offset + word_length);
	shift_within_word = start + 1 - length;
	shift = shift_to_word + shift_within_word;

In the case where 'total_length == word_length' AND 'word_offset ==
0' (which indicates an instruction of a single word), we see that the
computed shift value will be unchanged.  However, when the total_length
and word_length are different, and the word_offset is non-zero then the
computed shift value will be different (and correct).

opcodes/ChangeLog:

	* cgen-ibld.in (insert_normal): Rework calculation of shift.
	* epiphany-ibld.c: Regenerate.
	* fr30-ibld.c: Regenerate.
	* frv-ibld.c: Regenerate.
	* ip2k-ibld.c: Regenerate.
	* iq2000-ibld.c: Regenerate.
	* lm32-ibld.c: Regenerate.
	* m32c-ibld.c: Regenerate.
	* m32r-ibld.c: Regenerate.
	* mep-ibld.c: Regenerate.
	* mt-ibld.c: Regenerate.
	* or1k-ibld.c: Regenerate.
	* xc16x-ibld.c: Regenerate.
	* xstormy16-ibld.c: Regenerate.
This commit is contained in:
Andrew Burgess 2016-01-31 00:41:12 +00:00
parent 0f99255d74
commit a143b0045c
15 changed files with 157 additions and 42 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
opcodes/ChangeLog
View file

@ -1,3 +1,20 @@
2016-02-02 Andrew Burgess <andrew.burgess@embecosm.com>
* cgen-ibld.in (insert_normal): Rework calculation of shift.
* epiphany-ibld.c: Regenerate.
* fr30-ibld.c: Regenerate.
* frv-ibld.c: Regenerate.
* ip2k-ibld.c: Regenerate.
* iq2000-ibld.c: Regenerate.
* lm32-ibld.c: Regenerate.
* m32c-ibld.c: Regenerate.
* m32r-ibld.c: Regenerate.
* mep-ibld.c: Regenerate.
* mt-ibld.c: Regenerate.
* or1k-ibld.c: Regenerate.
* xc16x-ibld.c: Regenerate.
* xstormy16-ibld.c: Regenerate.
2016-02-02 Andrew Burgess <andrew.burgess@embecosm.com>
* epiphany-dis.c: Regenerated from latest cpu files.

13
opcodes/cgen-ibld.in
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/epiphany-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/fr30-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/frv-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/ip2k-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/iq2000-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/lm32-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/m32c-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/m32r-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/mep-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/mt-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/or1k-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/xc16x-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}

13
opcodes/xstormy16-ibld.c
View file

@ -207,12 +207,19 @@ insert_normal (CGEN_CPU_DESC cd,
#if CGEN_INT_INSN_P
{
int shift;
int shift_within_word, shift_to_word, shift;
/* How to shift the value to BIT0 of the word. */
shift_to_word = total_length - (word_offset + word_length);
/* How to shift the value to the field within the word. */
if (CGEN_INSN_LSB0_P)
shift = (word_offset + start + 1) - length;
shift_within_word = start + 1 - length;
else
shift = total_length - (word_offset + start + length);
shift_within_word = word_length - start - length;
/* The total SHIFT, then mask in the value. */
shift = shift_to_word + shift_within_word;
*buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
}