Type checks for the first 3 operands of the
__builtin_ppc_atomic_cas_local were missed with its initial
implementation. This patch adds the following checks
c1. Make sure the size of first 3 operands is the same.
c2. Do not allow function pointers as arguments.
c3. Report error when -mno-quad-memory-atomic is used but 128 bit
operands are used as the first 3 operands.
c4. A separate issue was when no lhs was assigned to this builtin, ICE would
happen as a result of emit_cmp_and_jump_insns function dereferencing the
target rtx which would be null. Added the check in rs6000_expand_builtin
to allocate a reg_rtx if target is null or const0_rtx.
Tests have been added to check all the implemented checks described
above.
1. pr126513-acmp-tst-1.c: Checks c1 and c2.
2. pr126513-acmp-tst-2.c: Checks c3.
3. pr126513-acmp-tst-3.c: Checks the ICE in c4.
2026-08-04 Avinash Jayakar <avinashd@linux.ibm.com>
gcc/ChangeLog:
PR target/126513
* config/rs6000/rs6000-builtin.cc (rs6000_expand_builtin): Allocate reg
if target is null or const0_rtx.
* config/rs6000/rs6000-c.cc (altivec_resolve_overloaded_builtin): Add
error handling for c1, c2 and c3 described in this commit.
gcc/testsuite/ChangeLog:
PR target/126513
* gcc.target/powerpc/pr126513-acmp-tst-1.c: New test.
* gcc.target/powerpc/pr126513-acmp-tst-2.c: New test.
* gcc.target/powerpc/pr126513-acmp-tst-3.c: New test.
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