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| author | Kazu Hirata <kazu@codesourcery.com> | 2009-04-22 16:09:40 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@gcc.gnu.org> | 2009-04-22 16:09:40 +0000 |
| commit | 6e782a29b9b9ee1187cb832a3af9bb0ceeae6349 (patch) | |
| tree | 56bbeb52f7d8a28a67c27660283844b999e9262a /gcc | |
| parent | 38d2336a2356074209d055098c7646cc30eb43df (diff) | |
| download | gcc-6e782a29b9b9ee1187cb832a3af9bb0ceeae6349.zip gcc-6e782a29b9b9ee1187cb832a3af9bb0ceeae6349.tar.gz gcc-6e782a29b9b9ee1187cb832a3af9bb0ceeae6349.tar.bz2 | |
arm.c (arm_size_rtx_costs): Treat a PLUS with a shift the same as a PLUS without a shift.
* config/arm/arm.c (arm_size_rtx_costs): Treat a PLUS with a shift
the same as a PLUS without a shift. Increase the cost of a
CONST_INT in MULT.
From-SVN: r146595
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/arm/arm.c | 15 |
2 files changed, 20 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4218dca..ec64ac2 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2009-04-22 Kazu Hirata <kazu@codesourcery.com> + + * config/arm/arm.c (arm_size_rtx_costs): Treat a PLUS with a shift + the same as a PLUS without a shift. Increase the cost of a + CONST_INT in MULT. + 2009-04-22 Manuel Lopez-Ibanez <manu@gcc.gnu.org> * Makefile.in: Update dependencies. diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 80d1267..547e760 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -5681,6 +5681,16 @@ arm_size_rtx_costs (rtx x, enum rtx_code code, enum rtx_code outer_code, return false; } + /* A shift as a part of ADD costs nothing. */ + if (GET_CODE (XEXP (x, 0)) == MULT + && power_of_two_operand (XEXP (XEXP (x, 0), 1), SImode)) + { + *total = COSTS_N_INSNS (TARGET_THUMB2 ? 2 : 1); + *total += rtx_cost (XEXP (XEXP (x, 0), 0), code, false); + *total += rtx_cost (XEXP (x, 1), code, false); + return true; + } + /* Fall through */ case AND: case XOR: case IOR: if (mode == SImode) @@ -5774,7 +5784,10 @@ arm_size_rtx_costs (rtx x, enum rtx_code code, enum rtx_code outer_code, case CONST_INT: if (const_ok_for_arm (INTVAL (x))) - *total = COSTS_N_INSNS (outer_code == SET ? 1 : 0); + /* A multiplication by a constant requires another instruction + to load the constant to a register. */ + *total = COSTS_N_INSNS ((outer_code == SET || outer_code == MULT) + ? 1 : 0); else if (const_ok_for_arm (~INTVAL (x))) *total = COSTS_N_INSNS (outer_code == AND ? 0 : 1); else if (const_ok_for_arm (-INTVAL (x))) |