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Revert "[rtl-optimization/117467] Avoid unnecessarily marking things live in ext-dce"

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This reverts commit 4ed07a11ee.
This commit is contained in:
Jeff Law 2025-03-11 18:01:33 -06:00
parent afb46540d3
commit 9cebf1234b
1 changed files with 0 additions and 12 deletions
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12
gcc/ext-dce.cc
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@ -643,18 +643,6 @@ ext_dce_process_uses (rtx_insn *insn, rtx obj,
/* The code of the RHS of a SET. */
enum rtx_code code = GET_CODE (src);
/* If we break the main loop below, then we will continue processing
sub-components of this RTX, including the SET_DEST.
That is not necessary if the SET_DEST is a REG. We can just bump the
iterator to the next element to skip handling the SET_DEST.
We can probably do this for ZERO_EXTRACT, STRICT_LOW_PART and SUBREG
destinations as well. But I want to rewrite all this code and keep
this fix conservative given we're deep into the gcc-15 release cycle. */
if (REG_P (dst))
iter.next ();
/* ?!? How much of this should mirror SET handling, potentially
being shared? */
if (SUBREG_P (dst) && SUBREG_BYTE (dst).is_constant ())