From b2e7e6fb8a3ba620d27b747624a9898716edf031 Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Thu, 17 Dec 1998 14:02:32 +0000 Subject: [PATCH] Do not generate CLOBBERs for non-pseudo regs. From-SVN: r24364 --- gcc/ChangeLog | 5 +++++ gcc/expr.c | 26 ++++++++++++++++++++++---- 2 files changed, 27 insertions(+), 4 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8982f68d248..c6a39842b41 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Thu Dec 17 13:57:23 1998 Nick Clifton + + * expr.c (emit_move_insn_1): Only emit a clobber if the target + is a pseudo register. + Thu Dec 17 13:50:29 1998 Nick Clifton * gcse.c: Include expr.h in order to get the prototype for diff --git a/gcc/expr.c b/gcc/expr.c index 534fac638a7..e943e53463e 100644 --- a/gcc/expr.c +++ b/gcc/expr.c @@ -2593,9 +2593,18 @@ emit_move_insn_1 (x, y) } else { - /* Show the output dies here. */ + /* Show the output dies here. This is only necessary for pseudos. */ if (x != y) - emit_insn (gen_rtx_CLOBBER (VOIDmode, x)); + { + rtx reg = x; + + while (GET_CODE (reg) == SUBREG) + reg = SUBREG_REG (reg); + + if (GET_CODE (reg) == REG + && REGNO (reg) >= FIRST_PSEUDO_REGISTER) + emit_insn (gen_rtx_CLOBBER (VOIDmode, x)); + } emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code) (gen_realpart (submode, x), gen_realpart (submode, y))); @@ -2624,9 +2633,18 @@ emit_move_insn_1 (x, y) } #endif - /* Show the output dies here. */ + /* Show the output dies here. This is only necessary for pseudos. */ if (x != y) - emit_insn (gen_rtx_CLOBBER (VOIDmode, x)); + { + rtx reg = x; + + while (GET_CODE (reg) == SUBREG) + reg = SUBREG_REG (reg); + + if (GET_CODE (reg) == REG + && REGNO (reg) >= FIRST_PSEUDO_REGISTER) + emit_insn (gen_rtx_CLOBBER (VOIDmode, x)); + } for (i = 0; i < (GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; -- 2.30.2