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| author | James Greenhalgh <james.greenhalgh@arm.com> | 2017-12-21 16:32:25 +0000 |
|---|---|---|
| committer | James Greenhalgh <jgreenhalgh@gcc.gnu.org> | 2017-12-21 16:32:25 +0000 |
| commit | c587c0a9c8cbe80a64461fe9cab0a23d3ff35211 (patch) | |
| tree | 2d4372af559ea44da1d6393984a83606e1b2bf64 /gcc/combine.c | |
| parent | 6ffc0c0cf5ada5d74da5c0b68fade4b5ec0e944a (diff) | |
| download | gcc-c587c0a9c8cbe80a64461fe9cab0a23d3ff35211.zip gcc-c587c0a9c8cbe80a64461fe9cab0a23d3ff35211.tar.gz gcc-c587c0a9c8cbe80a64461fe9cab0a23d3ff35211.tar.bz2 | |
[Patch combine] Don't create ZERO_EXTEND from subregs unless we have a scalar int mode
gcc/
* combine.c (simplify_set): Do not transform subregs to zero_extends
if the destination is not a scalar int mode.
From-SVN: r255945
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index e78a713..31e6a4f 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -6967,12 +6967,13 @@ simplify_set (rtx x) /* If we have (set FOO (subreg:M (mem:N BAR) 0)) with M wider than N, this would require a paradoxical subreg. Replace the subreg with a zero_extend to avoid the reload that would otherwise be required. - Don't do this for vector modes, as the transformation is incorrect. */ + Don't do this unless we have a scalar integer mode, otherwise the + transformation is incorrect. */ enum rtx_code extend_op; if (paradoxical_subreg_p (src) && MEM_P (SUBREG_REG (src)) - && !VECTOR_MODE_P (GET_MODE (src)) + && SCALAR_INT_MODE_P (GET_MODE (src)) && (extend_op = load_extend_op (GET_MODE (SUBREG_REG (src)))) != UNKNOWN) { SUBST (SET_SRC (x), |