diff options
| author | pinskia <pinskia@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-09-01 18:52:19 +0000 |
|---|---|---|
| committer | pinskia <pinskia@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-09-01 18:52:19 +0000 |
| commit | 0400917b78f2606c724615cfbe6a3ff6ccae9492 (patch) | |
| tree | be556f5593c16ed2a60e57ca2ab1b9d6e738f2be /gcc/simplify-rtx.c | |
| parent | 55760e6b1e157d6b7d0456993856f41ace841d2b (diff) | |
| download | gcc-0400917b78f2606c724615cfbe6a3ff6ccae9492.tar.gz | |
2012-09-01 Andrew Pinski <apinski@cavium.com>
* simplify-rtx.c (simplify_unary_operation_1 <case TRUNCATE>):
A truncate of a memory is just loading the low part of the memory.
2012-09-01 Andrew Pinski <apinski@cavium.com>
* gcc.target/mips/truncate-8.c: New testcase.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@190848 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index a878048ac97..f59150ee2c1 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -869,6 +869,14 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op) && COMPARISON_P (op) && (STORE_FLAG_VALUE & ~GET_MODE_MASK (mode)) == 0) return rtl_hooks.gen_lowpart_no_emit (mode, op); + + /* A truncate of a memory is just loading the low part of the memory + if we are not changing the meaning of the address. */ + if (GET_CODE (op) == MEM + && !MEM_VOLATILE_P (op) + && !mode_dependent_address_p (XEXP (op, 0))) + return rtl_hooks.gen_lowpart_no_emit (mode, op); + break; case FLOAT_TRUNCATE: |