diff options
Diffstat (limited to 'gcc/config/xtensa/xtensa.md')
| -rw-r--r-- | gcc/config/xtensa/xtensa.md | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md index 5db5c0ca487..cc722b932a9 100644 --- a/gcc/config/xtensa/xtensa.md +++ b/gcc/config/xtensa/xtensa.md @@ -97,6 +97,7 @@ "" " { + rtx srclo; rtx dstlo = gen_lowpart (SImode, operands[0]); rtx src1lo = gen_lowpart (SImode, operands[1]); rtx src2lo = gen_lowpart (SImode, operands[2]); @@ -105,9 +106,21 @@ rtx src1hi = gen_highpart (SImode, operands[1]); rtx src2hi = gen_highpart (SImode, operands[2]); + /* Either source can be used for overflow checking, as long as it's + not clobbered by the first addition. */ + if (!rtx_equal_p (dstlo, src1lo)) + srclo = src1lo; + else if (!rtx_equal_p (dstlo, src2lo)) + srclo = src2lo; + else + { + srclo = gen_reg_rtx (SImode); + emit_move_insn (srclo, src1lo); + } + emit_insn (gen_addsi3 (dstlo, src1lo, src2lo)); emit_insn (gen_addsi3 (dsthi, src1hi, src2hi)); - emit_insn (gen_adddi_carry (dsthi, dstlo, src2lo)); + emit_insn (gen_adddi_carry (dsthi, dstlo, srclo)); DONE; }") @@ -209,9 +222,9 @@ rtx src1hi = gen_highpart (SImode, operands[1]); rtx src2hi = gen_highpart (SImode, operands[2]); - emit_insn (gen_subsi3 (dstlo, src1lo, src2lo)); emit_insn (gen_subsi3 (dsthi, src1hi, src2hi)); emit_insn (gen_subdi_carry (dsthi, src1lo, src2lo)); + emit_insn (gen_subsi3 (dstlo, src1lo, src2lo)); DONE; }") @@ -2387,7 +2400,7 @@ ;; to set up the frame pointer. (define_insn "set_frame_ptr" - [(unspec_volatile [(const_int 0)] UNSPECV_SET_FP)] + [(set (reg:SI A7_REG) (unspec_volatile [(const_int 0)] UNSPECV_SET_FP))] "" "* { @@ -2401,7 +2414,7 @@ ;; Post-reload splitter to remove fp assignment when it's not needed. (define_split - [(unspec_volatile [(const_int 0)] UNSPECV_SET_FP)] + [(set (reg:SI A7_REG) (unspec_volatile [(const_int 0)] UNSPECV_SET_FP))] "reload_completed && !frame_pointer_needed" [(unspec [(const_int 0)] UNSPEC_NOP)] "") |