From: Richard Henderson Date: Wed, 21 Dec 2011 00:34:09 +0000 (-0800) Subject: arm: Use arm_cmpdi_unsigned for thumb2 as well X-Git-Tag: releases/gcc-4.7.0~1393 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=6cb2b9646d8daf773d1e8a02c9988dbbc9af1d8c;p=thirdparty%2Fgcc.git 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 --- 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")] )