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| author | Roger Sayle <roger@nextmovesoftware.com> | 2021-08-23 15:35:05 +0100 |
|---|---|---|
| committer | Roger Sayle <roger@nextmovesoftware.com> | 2021-08-23 15:35:05 +0100 |
| commit | 89ff4f027b5c92e96a8527920b8ccc3b94aec672 (patch) | |
| tree | a32960adb57fec330b545e56be32c1dcafafdf35 /gcc | |
| parent | 0230e69a3fabe6ad1d80cdf308ad1bf1934c4381 (diff) | |
| download | gcc-89ff4f027b5c92e96a8527920b8ccc3b94aec672.zip gcc-89ff4f027b5c92e96a8527920b8ccc3b94aec672.tar.gz gcc-89ff4f027b5c92e96a8527920b8ccc3b94aec672.tar.bz2 | |
[Committed] Restore build on !TARGET_TRULY_NOOP_TRUNCATION targets
My sincere apologies to everyone, but especially Andrew Pinski
who warned me in advance that TRULY_NOOP_TRUNCATION results in
different code paths/optimizations on some targets. This restores
the build on nvptx-none (and presumably others) where mysteriously
(truncate:QI (reg:QI)) fails to be simplified to (reg:QI), which
is expected (everywhere) in my recently added self-tests.
2021-08-23 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
* simplify-rtx.c (simplify_unary_operation_1): [TRUNCATE]:
Handle case where the operand is already the desired mode.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/simplify-rtx.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index f3df614..8eea9fb 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -1268,6 +1268,9 @@ simplify_context::simplify_unary_operation_1 (rtx_code code, machine_mode mode, return temp; } + /* Check for useless truncation. */ + if (GET_MODE (op) == mode) + return op; break; case FLOAT_TRUNCATE: |