From 884815aa85fb661f34e3ea02c2a5b5aa02622ded Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Thu, 8 Jul 2004 06:08:52 +0000 Subject: [PATCH] expmed.c (emit_store_flag): Also special-case double-word (in-)equality comparison against -1. * expmed.c (emit_store_flag): Also special-case double-word (in-)equality comparison against -1. From-SVN: r84268 --- gcc/ChangeLog | 3 +++ gcc/expmed.c | 18 ++++++++++-------- 2 files changed, 13 insertions(+), 8 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 7e6ccaa7ab8..74463e757b7 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,8 @@ 2004-07-06 Jan Beulich + * expmed.c (emit_store_flag): Also special-case double-word + (in-)equality comparison against -1. + * config/i386/i386.c (ix86_gimplify_va_arg): Don't need temporary for passing arguments the containers for which are registers. diff --git a/gcc/expmed.c b/gcc/expmed.c index 6ee291370d0..ba3c9a6f83b 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -4602,27 +4602,29 @@ emit_store_flag (rtx target, enum rtx_code code, rtx op0, rtx op1, break; } - /* If we are comparing a double-word integer with zero, we can convert - the comparison into one involving a single word. */ + /* If we are comparing a double-word integer with zero or -1, we can + convert the comparison into one involving a single word. */ if (GET_MODE_BITSIZE (mode) == BITS_PER_WORD * 2 && GET_MODE_CLASS (mode) == MODE_INT - && op1 == const0_rtx && (!MEM_P (op0) || ! MEM_VOLATILE_P (op0))) { - if (code == EQ || code == NE) + if ((code == EQ || code == NE) + && (op1 == const0_rtx || op1 == constm1_rtx)) { rtx op00, op01, op0both; - /* Do a logical OR of the two words and compare the result. */ + /* Do a logical OR or AND of the two words and compare the result. */ op00 = simplify_gen_subreg (word_mode, op0, mode, 0); op01 = simplify_gen_subreg (word_mode, op0, mode, UNITS_PER_WORD); - op0both = expand_binop (word_mode, ior_optab, op00, op01, - NULL_RTX, unsignedp, OPTAB_DIRECT); + op0both = expand_binop (word_mode, + op1 == const0_rtx ? ior_optab : and_optab, + op00, op01, NULL_RTX, unsignedp, OPTAB_DIRECT); + if (op0both != 0) return emit_store_flag (target, code, op0both, op1, word_mode, unsignedp, normalizep); } - else if (code == LT || code == GE) + else if ((code == LT || code == GE) && op1 == const0_rtx) { rtx op0h; -- 2.30.2