diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/spu/spu.c | 24 |
2 files changed, 29 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 67ae4ed..1a43c12 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,11 @@ 2011-08-16 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> + * config/spu/spu.c (spu_emit_branch_or_set): Avoid reverse tests + when generating an integer result where possible. Short-cut + comparison against 0 also for QImode. + +2011-08-16 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> + * config/spu/spu.h (LEGITIMIZE_RELOAD_ADDRESS): New macro. * config/spu/spu-protos.h (spu_legitimize_reload_address): Add prototype. diff --git a/gcc/config/spu/spu.c b/gcc/config/spu/spu.c index 7868c7f..b8e3fb3 100644 --- a/gcc/config/spu/spu.c +++ b/gcc/config/spu/spu.c @@ -982,6 +982,27 @@ spu_emit_branch_or_set (int is_set, rtx cmp, rtx operands[]) } } + /* However, if we generate an integer result, performing a reverse test + would require an extra negation, so avoid that where possible. */ + if (GET_CODE (op1) == CONST_INT && is_set == 1) + { + HOST_WIDE_INT val = INTVAL (op1) + 1; + if (trunc_int_for_mode (val, GET_MODE (op0)) == val) + switch (code) + { + case LE: + op1 = GEN_INT (val); + code = LT; + break; + case LEU: + op1 = GEN_INT (val); + code = LTU; + break; + default: + break; + } + } + comp_mode = SImode; op_mode = GET_MODE (op0); @@ -1113,7 +1134,8 @@ spu_emit_branch_or_set (int is_set, rtx cmp, rtx operands[]) if (is_set == 0 && op1 == const0_rtx && (GET_MODE (op0) == SImode - || GET_MODE (op0) == HImode) && scode == SPU_EQ) + || GET_MODE (op0) == HImode + || GET_MODE (op0) == QImode) && scode == SPU_EQ) { /* Don't need to set a register with the result when we are comparing against zero and branching. */ |