From 6cb2b9646d8daf773d1e8a02c9988dbbc9af1d8c Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Tue, 20 Dec 2011 16:34:09 -0800 Subject: [PATCH] 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 --- gcc/ChangeLog | 5 +++++ gcc/config/arm/arm.c | 4 ++-- gcc/config/arm/arm.md | 4 ++-- 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4b4d10fc5389..f5ec754649bc 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2011-12-20 Richard Henderson + + * 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 * 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 b6d619ee7386..b682a9f0d9df 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 1b2d9d9b4b4b..a5b1df6dada7 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")] ) -- 2.47.3