From 3ac7348b6613e97c09c3dc1a6e103a6679beee6f Mon Sep 17 00:00:00 2001 From: Richard Stallman Date: Sun, 11 Jul 1993 22:52:46 +0000 Subject: (output_move_double): Fix typos in Jun 28 change. Only set highest_first if first reg of dest overlaps memory src address. Otherwise, if addreg1 set and is same as second reg of dest, suppress trailing decrement. From-SVN: r4907 --- gcc/config/i860/i860.c | 32 ++++++++++++++++++++++---------- 1 file changed, 22 insertions(+), 10 deletions(-) (limited to 'gcc') diff --git a/gcc/config/i860/i860.c b/gcc/config/i860/i860.c index da7d0ab..7201f05 100644 --- a/gcc/config/i860/i860.c +++ b/gcc/config/i860/i860.c @@ -573,6 +573,7 @@ output_move_double (operands) rtx latehalf[2]; rtx addreg0 = 0, addreg1 = 0; int highest_first = 0; + int no_addreg1_decrement = 0; /* First classify both operands. */ @@ -681,22 +682,33 @@ output_move_double (operands) else if (optype0 == REGOP && optype1 != REGOP && reg_overlap_mentioned_p (operands[0], operands[1])) { - if (reg_mentioned_p (op0, XEXP (op1, 0)) - && reg_mentioned_p (latehalf[0], XEXP (op1, 0))) + /* If both halves of dest are used in the src memory address, + add the two regs and put them in the low reg (operands[0]). + Then it works to load latehalf first. */ + if (reg_mentioned_p (operands[0], XEXP (operands[1], 0)) + && reg_mentioned_p (latehalf[0], XEXP (operands[1], 0))) { - /* If both halves of dest are used in the src memory address, - add the two regs and put them in the low reg (op0). - Then it works to load latehalf first. */ rtx xops[2]; xops[0] = latehalf[0]; - xops[1] = op0; + xops[1] = operands[0]; output_asm_insn ("adds %1,%0,%1", xops); - operands[1] = gen_rtx (MEM, DImode, op0); + operands[1] = gen_rtx (MEM, DImode, operands[0]); latehalf[1] = adj_offsettable_operand (operands[1], 4); addreg1 = 0; + highest_first = 1; } - /* Do the late half first. */ - highest_first = 1; + /* Only one register in the dest is used in the src memory address, + and this is the first register of the dest, so we want to do + the late half first here also. */ + else if (! reg_mentioned_p (latehalf[0], XEXP (operands[1], 0))) + highest_first = 1; + /* Only one register in the dest is used in the src memory address, + and this is the second register of the dest, so we want to do + the late half last. If addreg1 is set, and addreg1 is the same + register as latehalf, then we must suppress the trailing decrement, + because it would clobber the value just loaded. */ + else if (addreg1 && reg_mentioned_p (addreg1, latehalf[0])) + no_addreg1_decrement = 1; } /* Normal case: do the two words, low-numbered first. @@ -718,7 +730,7 @@ output_move_double (operands) /* Undo the adds we just did. */ if (addreg0) output_asm_insn ("adds -0x4,%0,%0", &addreg0); - if (addreg1) + if (addreg1 && !no_addreg1_decrement) output_asm_insn ("adds -0x4,%0,%0", &addreg1); if (highest_first) -- cgit v1.1