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simplify-rtx.c (simplify_unary_operation_1): Return new expression in the requested machine mode.

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* simplify-rtx.c (simplify_unary_operation_1) <TRUNCATE>: Return
	new expression in the requested machine mode.

From-SVN: r110959
This commit is contained in:
Adam Nemet 2006-02-14 07:10:35 +00:00 committed by Adam Nemet
parent 3bf78d3be2
commit e963b86613
2 changed files with 9 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2006-02-13 Adam Nemet <anemet@caviumnetworks.com>
* simplify-rtx.c (simplify_unary_operation_1) <TRUNCATE>: Return
new expression in the requested machine mode.
2006-02-13 Roger Sayle <roger@eyesopen.com>
* optabs.c (expand_abs): Don't call do_jump_by_parts_greater_rtx

7
gcc/simplify-rtx.c
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@ -609,12 +609,13 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
return simplify_gen_unary (GET_CODE (op), mode,
XEXP (XEXP (op, 0), 0), mode);
/* (truncate:SI (subreg:DI (truncate:SI X) 0)) is
(truncate:SI x). */
/* (truncate:A (subreg:B (truncate:C X) 0)) is
(truncate:A X). */
if (GET_CODE (op) == SUBREG
&& GET_CODE (SUBREG_REG (op)) == TRUNCATE
&& subreg_lowpart_p (op))
return SUBREG_REG (op);
return simplify_gen_unary (TRUNCATE, mode, XEXP (SUBREG_REG (op), 0),
GET_MODE (XEXP (SUBREG_REG (op), 0)));
/* If we know that the value is already truncated, we can
replace the TRUNCATE with a SUBREG if TRULY_NOOP_TRUNCATION