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| author | Jeff Law <law@gcc.gnu.org> | 1994-11-15 10:12:02 -0700 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1994-11-15 10:12:02 -0700 |
| commit | 923f781d832a9ac82e0013d035a7b7afb108f6ff (patch) | |
| tree | 336ae188b1c9db092db528aad6a8349da39af8c6 /gcc/config/pa/pa.c | |
| parent | 8329b5ec7ebc12f94f03a60ecb2e026bb2ebe9bf (diff) | |
| download | gcc-923f781d832a9ac82e0013d035a7b7afb108f6ff.zip gcc-923f781d832a9ac82e0013d035a7b7afb108f6ff.tar.gz gcc-923f781d832a9ac82e0013d035a7b7afb108f6ff.tar.bz2 | |
pa.c (output_cbranch): Improve code for short backwards branch with an unfilled delay slot.
* pa.c (output_cbranch): Improve code for short backwards branch
with an unfilled delay slot.
(output_bb, output_dbra, output_movb): Likewise.
From-SVN: r8441
Diffstat (limited to 'gcc/config/pa/pa.c')
| -rw-r--r-- | gcc/config/pa/pa.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c index a458203..d70dad6 100644 --- a/gcc/config/pa/pa.c +++ b/gcc/config/pa/pa.c @@ -3444,6 +3444,21 @@ output_cbranch (operands, nullify, length, negated, insn) strcat (buf, "%B3"); strcat (buf, ",n %2,%1,.+12\n\tbl %0,0"); } + /* Handle short backwards branch with an unfilled delay slot. + Using a comb;nop rather than comiclr;bl saves 1 cycle for both + taken and untaken branches. */ + else if (dbr_sequence_length () == 0 + && ! forward_branch_p (insn) + && insn_addresses + && VAL_14_BITS_P (insn_addresses[INSN_UID (JUMP_LABEL (insn))] + - insn_addresses[INSN_UID (insn)])) + { + strcpy (buf, "com%I2b,"); + if (negated) + strcat (buf, "%B3 %2,%1,%0%#"); + else + strcat (buf, "%S3 %2,%1,%0%#"); + } else { strcpy (buf, "com%I2clr,"); @@ -3556,6 +3571,26 @@ output_bb (operands, nullify, length, negated, insn, which) else strcat (buf, " %0,%1,.+12\n\tbl %2,0"); } + /* Handle short backwards branch with an unfilled delay slot. + Using a bb;nop rather than extrs;bl saves 1 cycle for both + taken and untaken branches. */ + else if (dbr_sequence_length () == 0 + && ! forward_branch_p (insn) + && insn_addresses + && VAL_14_BITS_P (insn_addresses[INSN_UID (JUMP_LABEL (insn))] + - insn_addresses[INSN_UID (insn)])) + { + strcpy (buf, "bb,"); + if ((which == 0 && negated) + || (which == 1 && ! negated)) + strcat (buf, ">="); + else + strcat (buf, "<"); + if (negated) + strcat (buf, " %0,%1,%3%#"); + else + strcat (buf, " %0,%1,%2%#"); + } else { strcpy (buf, "extrs,"); @@ -3641,6 +3676,15 @@ output_dbra (operands, insn, which_alternative) && ! forward_branch_p (insn) && nullify) return "addib,%N2,n %1,%0,.+12\n\tbl %3,0"; + /* Handle short backwards branch with an unfilled delay slot. + Using a addb;nop rather than addi;bl saves 1 cycle for both + taken and untaken branches. */ + else if (dbr_sequence_length () == 0 + && ! forward_branch_p (insn) + && insn_addresses + && VAL_14_BITS_P (insn_addresses[INSN_UID (JUMP_LABEL (insn))] + - insn_addresses[INSN_UID (insn)])) + return "addib,%C2 %1,%0,%3%#"; /* Handle normal cases. */ if (nullify) @@ -3738,6 +3782,15 @@ output_movb (operands, insn, which_alternative, reverse_comparison) && nullify) return "movb,%N2,n %1,%0,.+12\n\ttbl %3,0"; + /* Handle short backwards branch with an unfilled delay slot. + Using a movb;nop rather than or;bl saves 1 cycle for both + taken and untaken branches. */ + else if (dbr_sequence_length () == 0 + && ! forward_branch_p (insn) + && insn_addresses + && VAL_14_BITS_P (insn_addresses[INSN_UID (JUMP_LABEL (insn))] + - insn_addresses[INSN_UID (insn)])) + return "movb,%C2 %1,%0,%3%#"; /* Handle normal cases. */ if (nullify) return "or,%N2 %1,%%r0,%0\n\tbl,n %3,0"; |