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| author | Richard Henderson <rth@redhat.com> | 2011-12-20 16:34:09 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2011-12-20 16:34:09 -0800 |
| commit | 6cb2b9646d8daf773d1e8a02c9988dbbc9af1d8c (patch) | |
| tree | 98c2a7e79873fca96e4f36f255f97656d57f2eb3 | |
| parent | fa14fefd24a177c3f9ee4303b8f19ef2bdeabaa3 (diff) | |
| download | gcc-6cb2b9646d8daf773d1e8a02c9988dbbc9af1d8c.zip gcc-6cb2b9646d8daf773d1e8a02c9988dbbc9af1d8c.tar.gz gcc-6cb2b9646d8daf773d1e8a02c9988dbbc9af1d8c.tar.bz2 | |
arm: Use arm_cmpdi_unsigned for thumb2 as well
This changes code generation from "eors; eors; orrs" (which ranges
from 6 to 12 bytes and requires three scratch registers), to
"cmp; it; cmp" (which is always 6 bytes for register inputs and
requires no scratch registers).
* config/arm/arm.md (*arm_cmpdi_unsigned): Enable for thumb2.
* config/arm/arm.c (arm_select_cc_mode): Use it.
From-SVN: r182561
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/arm/arm.c | 4 | ||||
| -rw-r--r-- | gcc/config/arm/arm.md | 4 |
3 files changed, 9 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4b4d10f..f5ec754 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2011-12-20 Richard Henderson <rth@redhat.com> + + * config/arm/arm.md (*arm_cmpdi_unsigned): Enable for thumb2. + * config/arm/arm.c (arm_select_cc_mode): Use it. + 2011-12-20 Richard Sandiford <rdsandiford@googlemail.com> * tree-ssa-math-opts.c (convert_plusminus_to_widen): Restrict diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index b6d619e..b682a9f0 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -11672,7 +11672,7 @@ arm_select_cc_mode (enum rtx_code op, rtx x, rtx y) return CC_Zmode; /* We can do an equality test in three Thumb instructions. */ - if (!TARGET_ARM) + if (!TARGET_32BIT) return CC_Zmode; /* FALLTHROUGH */ @@ -11684,7 +11684,7 @@ arm_select_cc_mode (enum rtx_code op, rtx x, rtx y) /* DImode unsigned comparisons can be implemented by cmp + cmpeq without a scratch register. Not worth doing in Thumb-2. */ - if (TARGET_ARM) + if (TARGET_32BIT) return CC_CZmode; /* FALLTHROUGH */ diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md index 1b2d9d9..a5b1df6 100644 --- a/gcc/config/arm/arm.md +++ b/gcc/config/arm/arm.md @@ -7541,8 +7541,8 @@ [(set (reg:CC_CZ CC_REGNUM) (compare:CC_CZ (match_operand:DI 0 "s_register_operand" "r") (match_operand:DI 1 "arm_di_operand" "rDi")))] - "TARGET_ARM" - "cmp%?\\t%R0, %R1\;cmpeq\\t%Q0, %Q1" + "TARGET_32BIT" + "cmp\\t%R0, %R1\;it eq\;cmpeq\\t%Q0, %Q1" [(set_attr "conds" "set") (set_attr "length" "8")] ) |