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i386-protos.h (ix86_expand_round): Declare.
2006-10-29 Richard Guenther <rguenther@suse.de> * config/i386/i386-protos.h (ix86_expand_round): Declare. (ix86_expand_rounddf_32): Likewise. * config/i386/i386.c (ix86_expand_round): New function expanding round inline for SSE math and -fno-trapping-math and if not optimizing for size. (ix86_expand_rounddf_32): Same for DFmode on 32bit archs. * config/i386/i386.md (rounddf2, roundsf2): New pattern expanding round via ix86_expand_round. * gcc.target/i386/math-torture/round.c: New testcase. From-SVN: r118146
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Richard Guenther
Richard Biener
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@ -1,3 +1,14 @@
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2006-10-29 Richard Guenther <rguenther@suse.de>
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* config/i386/i386-protos.h (ix86_expand_round): Declare.
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(ix86_expand_rounddf_32): Likewise.
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* config/i386/i386.c (ix86_expand_round): New function expanding
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round inline for SSE math and -fno-trapping-math and if not
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optimizing for size.
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(ix86_expand_rounddf_32): Same for DFmode on 32bit archs.
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* config/i386/i386.md (rounddf2, roundsf2): New pattern expanding
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round via ix86_expand_round.
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2006-10-29 Richard Guenther <rguenther@suse.de>
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* config/i386/i386-protos.h (ix86_expand_floorceil): Declare.
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@ -162,6 +162,8 @@ extern void ix86_expand_lfloorceil (rtx, rtx, bool);
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extern void ix86_expand_rint (rtx, rtx);
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extern void ix86_expand_floorceil (rtx, rtx, bool);
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extern void ix86_expand_floorceildf_32 (rtx, rtx, bool);
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extern void ix86_expand_round (rtx, rtx);
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extern void ix86_expand_rounddf_32 (rtx, rtx);
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#ifdef TREE_CODE
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extern void init_cumulative_args (CUMULATIVE_ARGS *, tree, rtx, tree);
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@ -19563,4 +19563,129 @@ ix86_expand_floorceil (rtx operand0, rtx operand1, bool do_floor)
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emit_move_insn (operand0, res);
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}
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/* Expand SSE sequence for computing round from OPERAND1 storing
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into OPERAND0. Sequence that works without relying on DImode truncation
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via cvttsd2siq that is only available on 64bit targets. */
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void
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ix86_expand_rounddf_32 (rtx operand0, rtx operand1)
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{
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/* C code for the stuff we expand below.
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double xa = fabs (x), xa2, x2;
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if (!isless (xa, TWO52))
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return x;
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Using the absolute value and copying back sign makes
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-0.0 -> -0.0 correct.
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xa2 = xa + TWO52 - TWO52;
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Compensate.
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dxa = xa2 - xa;
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if (dxa <= -0.5)
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xa2 += 1;
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else if (dxa > 0.5)
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xa2 -= 1;
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x2 = copysign (xa2, x);
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return x2;
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*/
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enum machine_mode mode = GET_MODE (operand0);
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rtx xa, xa2, dxa, TWO52, tmp, label, half, mhalf, one, res, mask;
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TWO52 = ix86_gen_TWO52 (mode);
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/* Temporary for holding the result, initialized to the input
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operand to ease control flow. */
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res = gen_reg_rtx (mode);
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emit_move_insn (res, operand1);
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/* xa = abs (operand1) */
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xa = ix86_expand_sse_fabs (res, &mask);
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/* if (!isless (xa, TWO52)) goto label; */
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label = ix86_expand_sse_compare_and_jump (UNLE, TWO52, xa, false);
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/* xa2 = xa + TWO52 - TWO52; */
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xa2 = gen_reg_rtx (mode);
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expand_simple_binop (mode, PLUS, xa, TWO52, xa2, 0, OPTAB_DIRECT);
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expand_simple_binop (mode, MINUS, xa2, TWO52, xa2, 0, OPTAB_DIRECT);
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/* dxa = xa2 - xa; */
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dxa = gen_reg_rtx (mode);
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expand_simple_binop (mode, MINUS, xa2, xa, dxa, 0, OPTAB_DIRECT);
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/* generate 0.5, 1.0 and -0.5 */
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half = force_reg (mode, const_double_from_real_value (dconsthalf, mode));
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one = gen_reg_rtx (mode);
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expand_simple_binop (mode, PLUS, half, half, one, 0, OPTAB_DIRECT);
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mhalf = gen_reg_rtx (mode);
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expand_simple_binop (mode, MINUS, half, one, mhalf, 0, OPTAB_DIRECT);
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/* Compensate. */
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tmp = gen_reg_rtx (mode);
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/* xa2 = xa2 - (dxa > 0.5 ? 1 : 0) */
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tmp = ix86_expand_sse_compare_mask (UNGT, dxa, half, false);
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emit_insn (gen_rtx_SET (VOIDmode, tmp,
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gen_rtx_AND (mode, one, tmp)));
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expand_simple_binop (mode, MINUS, xa2, tmp, xa2, 0, OPTAB_DIRECT);
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/* xa2 = xa2 + (dxa <= -0.5 ? 1 : 0) */
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tmp = ix86_expand_sse_compare_mask (UNGE, mhalf, dxa, false);
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emit_insn (gen_rtx_SET (VOIDmode, tmp,
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gen_rtx_AND (mode, one, tmp)));
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expand_simple_binop (mode, PLUS, xa2, tmp, xa2, 0, OPTAB_DIRECT);
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/* res = copysign (xa2, operand1) */
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ix86_sse_copysign_to_positive (res, xa2, force_reg (mode, operand1), mask);
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emit_label (label);
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LABEL_NUSES (label) = 1;
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emit_move_insn (operand0, res);
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}
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/* Expand SSE sequence for computing round from OPERAND1 storing
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into OPERAND0. */
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void
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ix86_expand_round (rtx operand0, rtx operand1)
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{
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/* C code for the stuff we're doing below:
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double xa = fabs (x);
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if (!isless (xa, TWO52))
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return x;
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xa = (double)(long)(xa + nextafter (0.5, 0.0));
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return copysign (xa, x);
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*/
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enum machine_mode mode = GET_MODE (operand0);
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rtx res, TWO52, xa, label, xi, half, mask;
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const struct real_format *fmt;
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REAL_VALUE_TYPE pred_half, half_minus_pred_half;
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/* Temporary for holding the result, initialized to the input
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operand to ease control flow. */
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res = gen_reg_rtx (mode);
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emit_move_insn (res, operand1);
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TWO52 = ix86_gen_TWO52 (mode);
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xa = ix86_expand_sse_fabs (res, &mask);
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label = ix86_expand_sse_compare_and_jump (UNLE, TWO52, xa, false);
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/* load nextafter (0.5, 0.0) */
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fmt = REAL_MODE_FORMAT (mode);
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real_2expN (&half_minus_pred_half, -(fmt->p) - 1);
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REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf, half_minus_pred_half);
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/* xa = xa + 0.5 */
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half = force_reg (mode, const_double_from_real_value (pred_half, mode));
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expand_simple_binop (mode, PLUS, xa, half, xa, 0, OPTAB_DIRECT);
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/* xa = (double)(int64_t)xa */
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xi = gen_reg_rtx (mode == DFmode ? DImode : SImode);
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expand_fix (xi, xa, 0);
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expand_float (xa, xi, 0);
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/* res = copysign (xa, operand1) */
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ix86_sse_copysign_to_positive (res, xa, force_reg (mode, operand1), mask);
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emit_label (label);
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LABEL_NUSES (label) = 1;
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emit_move_insn (operand0, res);
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}
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#include "gt-i386.h"
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@ -17217,6 +17217,31 @@
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DONE;
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})
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(define_expand "roundsf2"
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[(match_operand:SF 0 "register_operand" "")
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(match_operand:SF 1 "nonimmediate_operand" "")]
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"SSE_FLOAT_MODE_P (SFmode) && TARGET_SSE_MATH
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&& !flag_trapping_math && !flag_rounding_math
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&& !optimize_size"
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{
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ix86_expand_round (operand0, operand1);
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DONE;
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})
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(define_expand "rounddf2"
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[(match_operand:DF 0 "register_operand" "")
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(match_operand:DF 1 "nonimmediate_operand" "")]
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"SSE_FLOAT_MODE_P (DFmode) && TARGET_SSE_MATH
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&& !flag_trapping_math && !flag_rounding_math
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&& !optimize_size"
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{
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if (TARGET_64BIT)
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ix86_expand_round (operand0, operand1);
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else
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ix86_expand_rounddf_32 (operand0, operand1);
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DONE;
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})
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(define_insn_and_split "*fistdi2_1"
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[(set (match_operand:DI 0 "nonimmediate_operand" "=m,?r")
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(unspec:DI [(match_operand:XF 1 "register_operand" "f,f")]
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@ -1,3 +1,7 @@
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2006-10-29 Richard Guenther <rguenther@suse.de>
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* gcc.target/i386/math-torture/round.c: New testcase.
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2006-10-29 Richard Guenther <rguenther@suse.de>
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* gcc.target/i386/math-torture/ceil.c: New testcase.
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15
gcc/testsuite/gcc.target/i386/math-torture/round.c
Normal file
15
gcc/testsuite/gcc.target/i386/math-torture/round.c
Normal file
@ -0,0 +1,15 @@
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/* { dg-do assemble } */
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float testlf (float x)
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{
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return __builtin_roundf (x);
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}
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double testl (double x)
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{
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return __builtin_round (x);
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}
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long double testll (long double x)
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{
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return __builtin_roundl (x);
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}
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