https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120292
Bug ID: 120292
Summary: amdgcn: Infinite recursion in vec_cmpu<mode>di_exec
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: build
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rsandifo at gcc dot gnu.org
Target Milestone: ---
Target: amdgcn*-*-*
The following pattern is infinitely recursive. It looks like it should be
calling "vec_cmp..." rather than "vec_cmpu...":
(define_expand "vec_cmpu<mode>di_exec"
[(match_operand:DI 0 "register_operand")
(match_operator 1 "gcn_compare_operator"
[(match_operand:V_INT_noQI 2 "gcn_alu_operand")
(match_operand:V_INT_noQI 3 "gcn_vop3_operand")])
(match_operand:DI 4 "gcn_exec_reg_operand")]
""
{
/* Unsigned comparisons use the same patterns as signed comparisons,
except that they use unsigned operators (e.g. LTU vs LT).
The '%E1' directive then does the Right Thing. */
emit_insn (gen_vec_cmpu<mode>di_exec (operands[0], operands[1],
operands[2], operands[3],
operands[4]));
DONE;
})
This causes a build of amdgcn-amdhsa to fail with --enable-werror:
.../gcc/config/gcn/gcn-valu.md: In function ‘rtx_def*
gen_vec_cmpuv32sidi_exec(rtx, rtx, rtx, rtx, rtx)’:
.../gcc/config/gcn/gcn-valu.md:3815:1: error: infinite recursion detected
[-Werror=infinite-recursion]
3815 | emit_insn (gen_<expander><mode><vnsi>2_exec (sitmp1, operands[2],
| ^ ~~~~~~~~~~~~~~~~~~~~
.../gcc/config/gcn/gcn-valu.md:3798:15: note: recursive call
3798 | emit_insn (gen_vec_cmpu<mode>di_exec (operands[0], operands[1],
| ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3799 | operands[2], operands[3],
| ~~~~~~~~~~~~~~~~~~~~~~~~~
3800 | operands[4]));
| ~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
