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| author | H.J. Lu <hjl.tools@gmail.com> | 2021-05-21 05:16:20 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-05-21 07:27:37 -0700 |
| commit | 53fb833d635da04f5b44af16bcea1082e7b59e75 (patch) | |
| tree | 6166e9128634ef8eb9e93e10f6e77b405d0c2921 /gcc/expr.c | |
| parent | 5d42db533324e80a7382b20b94cace5b202d41ea (diff) | |
| download | gcc-53fb833d635da04f5b44af16bcea1082e7b59e75.zip gcc-53fb833d635da04f5b44af16bcea1082e7b59e75.tar.gz gcc-53fb833d635da04f5b44af16bcea1082e7b59e75.tar.bz2 | |
Elide expand_constructor if move by pieces is preferred
Elide expand_constructor when the constructor is static storage and not
mostly zeros and we can move it by pieces prefer to do so since that's
usually more efficient than performing a series of stores from immediates.
2021-05-21 Richard Biener <rguenther@suse.de>
H.J. Lu <hjl.tools@gmail.com>
gcc/
PR middle-end/90773
* expr.c (expand_constructor): Elide expand_constructor if
move by pieces is preferred.
gcc/testsuite/
* gcc.target/i386/pr90773-24.c: New test.
* gcc.target/i386/pr90773-25.c: Likewise.
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 13 |
1 files changed, 13 insertions, 0 deletions
@@ -8523,6 +8523,19 @@ expand_constructor (tree exp, rtx target, enum expand_modifier modifier, return constructor; } + /* If the CTOR is available in static storage and not mostly + zeros and we can move it by pieces prefer to do so since + that's usually more efficient than performing a series of + stores from immediates. */ + if (avoid_temp_mem + && TREE_STATIC (exp) + && TREE_CONSTANT (exp) + && tree_fits_uhwi_p (TYPE_SIZE_UNIT (type)) + && can_move_by_pieces (tree_to_uhwi (TYPE_SIZE_UNIT (type)), + TYPE_ALIGN (type)) + && ! mostly_zeros_p (exp)) + return NULL_RTX; + /* Handle calls that pass values in multiple non-contiguous locations. The Irix 6 ABI has examples of this. */ if (target == 0 || ! safe_from_p (target, exp, 1) |