From 0f6d8eebedb8889622ac22e951cda9a462379be8 Mon Sep 17 00:00:00 2001 From: nemet Date: Mon, 3 Apr 2006 18:12:15 +0000 Subject: [PATCH] * simplify-rtx.c (simplify_unary_operation_1) : When trying to remove TRUNCATE check if all bits outside the new mode are identical to the sign bit. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@112643 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 6 ++++++ gcc/simplify-rtx.c | 3 ++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b264035..d157632 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2006-04-03 Adam Nemet + + * simplify-rtx.c (simplify_unary_operation_1) : When + trying to remove TRUNCATE check if all bits outside the new mode + are identical to the sign bit. + 2006-04-03 Jeff Law * tree-ssa-dom.c (propagate_rhs_into_lhs): Avoid useless folding diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index cac77ad..0ce033d 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -656,7 +656,8 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op) if ((TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), GET_MODE_BITSIZE (GET_MODE (op))) ? (num_sign_bit_copies (op, GET_MODE (op)) - >= (unsigned int) (GET_MODE_BITSIZE (mode) + 1)) + > (unsigned int) (GET_MODE_BITSIZE (GET_MODE (op)) + - GET_MODE_BITSIZE (mode))) : truncated_to_mode (mode, op)) && ! (GET_CODE (op) == LSHIFTRT && GET_CODE (XEXP (op, 0)) == MULT)) -- 2.7.4