From 97d3ddcfc9c67d26e3869a261a506ef70e7f092e Mon Sep 17 00:00:00 2001 From: Uros Bizjak Date: Mon, 28 Dec 2020 16:52:45 +0100 Subject: [PATCH] i386: Use existing temporary register in rounding functions MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit It is possible to avoid the call to force_reg and use existing temporary register in ix86_expand_trunc, ix86_expand_round and ix86_expand_rounddf_32 expanders. 2020-12-28 Uroš Bizjak gcc/ * config/i386/i386-expand.c (ix86_expand_trunc): Use existing temporary register to avoid a call to force_reg. --- gcc/config/i386/i386-expand.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/gcc/config/i386/i386-expand.c b/gcc/config/i386/i386-expand.c index c856489c046..5fe38052056 100644 --- a/gcc/config/i386/i386-expand.c +++ b/gcc/config/i386/i386-expand.c @@ -16513,13 +16513,15 @@ ix86_expand_trunc (rtx operand0, rtx operand1) /* if (!isless (xa, TWO52)) goto label; */ label = ix86_expand_sse_compare_and_jump (UNLE, TWO52, xa, false); - /* x = (double)(long)x */ + /* xa = (double)(long)x */ xi = gen_reg_rtx (mode == DFmode ? DImode : SImode); expand_fix (xi, res, 0); - expand_float (res, xi, 0); + expand_float (xa, xi, 0); if (HONOR_SIGNED_ZEROS (mode)) - ix86_sse_copysign_to_positive (res, res, force_reg (mode, operand1), mask); + ix86_sse_copysign_to_positive (xa, xa, res, mask); + + emit_move_insn (res, xa); emit_label (label); LABEL_NUSES (label) = 1; @@ -16629,7 +16631,7 @@ ix86_expand_round (rtx operand0, rtx operand1) expand_float (xa, xi, 0); /* res = copysign (xa, operand1) */ - ix86_sse_copysign_to_positive (res, xa, force_reg (mode, operand1), mask); + ix86_sse_copysign_to_positive (res, xa, res, mask); emit_label (label); LABEL_NUSES (label) = 1; @@ -16700,7 +16702,7 @@ ix86_expand_rounddf_32 (rtx operand0, rtx operand1) xa2 = expand_simple_binop (mode, PLUS, xa2, tmp, NULL_RTX, 0, OPTAB_DIRECT); /* res = copysign (xa2, operand1) */ - ix86_sse_copysign_to_positive (res, xa2, force_reg (mode, operand1), mask); + ix86_sse_copysign_to_positive (res, xa2, res, mask); emit_label (label); LABEL_NUSES (label) = 1; -- 2.30.2