https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91016
Bug ID: 91016
Summary: A suspicious code in config/i386/i386-expand.c
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
16048 /* generate 0.5, 1.0 and -0.5 */
16049 half = force_reg (mode, const_double_from_real_value (dconsthalf,
mode));
16050 one = expand_simple_binop (mode, PLUS, half, half, NULL_RTX, 0,
OPTAB_DIRECT);
16051 mhalf = expand_simple_binop (mode, MINUS, half, one, NULL_RTX,
16052 0, OPTAB_DIRECT);
16053
16054 /* Compensate. */
16055 tmp = gen_reg_rtx (mode);
16056 /* xa2 = xa2 - (dxa > 0.5 ? 1 : 0) */
16057 tmp = ix86_expand_sse_compare_mask (UNGT, dxa, half, false);
16058 emit_insn (gen_rtx_SET (tmp, gen_rtx_AND (mode, one, tmp)));
16059 xa2 = expand_simple_binop (mode, MINUS, xa2, tmp, NULL_RTX, 0,
OPTAB_DIRECT);
16060 /* xa2 = xa2 + (dxa <= -0.5 ? 1 : 0) */
16061 tmp = ix86_expand_sse_compare_mask (UNGE, mhalf, dxa, false);
16062 emit_insn (gen_rtx_SET (tmp, gen_rtx_AND (mode, one, tmp)));
16063 xa2 = expand_simple_binop (mode, PLUS, xa2, tmp, NULL_RTX, 0,
OPTAB_DIRECT);
As seen, 'tmp' at 16055 is never used.
Can please port maintainers take a look?
