From patchwork Thu Nov 18 12:26:14 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Artem Shinkarov X-Patchwork-Id: 72086 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from sourceware.org (server1.sourceware.org [209.132.180.131]) by ozlabs.org (Postfix) with SMTP id 7341CB71A7 for ; Thu, 18 Nov 2010 23:26:56 +1100 (EST) Received: (qmail 24803 invoked by alias); 18 Nov 2010 12:26:51 -0000 Received: (qmail 24633 invoked by uid 22791); 18 Nov 2010 12:26:46 -0000 X-SWARE-Spam-Status: No, hits=-1.0 required=5.0 tests=AWL, BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SARE_OBFU_PART_ING, TW_BJ X-Spam-Check-By: sourceware.org Received: from mail-qy0-f175.google.com (HELO mail-qy0-f175.google.com) (209.85.216.175) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 18 Nov 2010 12:26:38 +0000 Received: by qyk7 with SMTP id 7so1335535qyk.20 for ; Thu, 18 Nov 2010 04:26:36 -0800 (PST) Received: by 10.229.97.11 with SMTP id j11mr552128qcn.113.1290083196173; Thu, 18 Nov 2010 04:26:36 -0800 (PST) MIME-Version: 1.0 Received: by 10.229.232.131 with HTTP; Thu, 18 Nov 2010 04:26:14 -0800 (PST) In-Reply-To: References: From: Artem Shinkarov Date: Thu, 18 Nov 2010 12:26:14 +0000 Message-ID: Subject: Re: Scalar vector binary operation To: "Joseph S. Myers" Cc: Richard Guenther , gcc-patches@gcc.gnu.org X-IsSubscribed: yes Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Delivered-To: mailing list gcc-patches@gcc.gnu.org Fixed. New function description is written, test is covering the case with integer to float conversion. 2010-11-18 Artjoms Sinkarovs /gcc * c-typeck.c (scalar_to_vector): New function. Try scalar to vector conversion. (stv_conv): New enum for scalar_to_vector return type. (build_binary_op): Adjust. * doc/extend.texi: Description of scalar to vector expansion. /gcc/c-family * c-common.c (unsafe_conversion_p): New function. Check if it is unsafe to convert an expression to the type. (conversion_warning): Adjust, use unsafe_conversion_p. * c-common.h (unsafe_conversion_p): New function declaration. /gcc/testsuite * gcc.c-torture/execute/scal-to-vec1.c: New test. * gcc.c-torture/execute/scal-to-vec2.c: New test. * gcc.c-torture/execute/scal-to-vec3.c: New test. * gcc.dg/scal-to-vec1.c: New test. bootstrapped and tested on x86_64_unknown-linux On Tue, Nov 16, 2010 at 4:39 PM, Joseph S. Myers wrote: > On Mon, 15 Nov 2010, Artem Shinkarov wrote: > >> -/* Warns if the conversion of EXPR to TYPE may alter a value. >> -   This is a helper function for warnings_for_convert_and_check.  */ >> - >> -static void >> -conversion_warning (tree type, tree expr) >> +/* Return true if expression EXPR cannot be converted to the type TYPE >> +   preserving its value. Funtion will produce warnings if PRODUCE_WARNS > > "Function" > >> +   is true.  */ >> +bool >> +unsafe_conversion_p (tree type, tree expr, bool produce_warns) > > Are you sure the comment accurately describes the semantics?  The > impression I get is that the new function is deliberately more restricted > in the expressions it takes and the intelligence it applies to them than > the old one - so the comment should say so (the point of the function > being to give warnings according to some well-defined semantics and *not* > to be smart in ways that may change unpredictably; the comment should make > the semantics clear) - and that some cases may not return true even when > you give a warning if produce_warns. > >> @@ -1917,11 +1879,17 @@ conversion_warning (tree type, tree expr >>          { >>            if (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type) >>             && tree_int_cst_sgn (expr) < 0) >> -         warning_at (loc, OPT_Wsign_conversion, "negative integer" >> -                     " implicitly converted to unsigned type"); >> +            { >> +              if (produce_warns) >> +             warning_at (loc, OPT_Wsign_conversion, "negative integer" >> +                         " implicitly converted to unsigned type"); > > Here for example.  If this returns true, what logic causes it to do so? > If not, why not?  (This sort of thing should best be made clear by > comments in the code.) > >> +        else if (!integer_only_op >> +                    /* Allow integer --> real conversion if safe.  */ >> +                 && (TREE_CODE (type0) == REAL_TYPE >> +                     || TREE_CODE (type0) == INTEGER_TYPE) >> +                 && SCALAR_FLOAT_TYPE_P (TREE_TYPE (type1))) >> +          { >> +            if (unsafe_conversion_p (TREE_TYPE (type1), op0, false)) >> +              { >> +                error_at (loc, "truncating floating point constant to " >> +                               "vector precision does not preserve value"); > > "floating-point" when used as an adjective. > > If you have an int constant that cannot be exactly converted to float, > what error do you get for converting it to a float vector?  This one > (which would be inappropriate since it's not a floating-point constant), > or another one?  And is there a testcase for this? > > -- > Joseph S. Myers > joseph@codesourcery.com > Index: gcc/doc/extend.texi =================================================================== --- gcc/doc/extend.texi (revision 166433) +++ gcc/doc/extend.texi (working copy) @@ -6333,18 +6333,25 @@ In C it is possible to use shifting oper integer-type vectors. The operation is defined as following: @code{@{a0, a1, @dots{}, an@} >> @{b0, b1, @dots{}, bn@} == @{a0 >> b0, a1 >> b1, @dots{}, an >> bn@}}@. Vector operands must have the same number of -elements. Additionally second operands can be a scalar integer in which -case the scalar is converted to the type used by the vector operand (with -possible truncation) and each element of this new vector is the scalar's -value. +elements. + +For the convenience in C it is allowed to use a binary vector operation +where one operand is a scalar. In that case the compiler will transform +the scalar operand into a vector where each element is the scalar from +the operation. The transformation will happen only if the scalar could be +safely converted to the vector-element type. Consider the following code. @smallexample typedef int v4si __attribute__ ((vector_size (16))); -v4si a, b; +v4si a, b, c; +long l; + +a = b + 1; /* a = b + @{1,1,1,1@}; */ +a = 2 * b; /* a = @{2,2,2,2@} * b; */ -b = a >> 1; /* b = a >> @{1,1,1,1@}; */ +a = l + a; /* Error, cannot convert long to int. */ @end smallexample In C vectors can be subscripted as if the vector were an array with Index: gcc/c-family/c-common.c =================================================================== --- gcc/c-family/c-common.c (revision 166433) +++ gcc/c-family/c-common.c (working copy) @@ -1852,56 +1852,26 @@ tree shorten_binary_op (tree result_type return result_type; } -/* Warns if the conversion of EXPR to TYPE may alter a value. - This is a helper function for warnings_for_convert_and_check. */ - -static void -conversion_warning (tree type, tree expr) +/* Checks if expression EXPR of real/integer type cannot be converted + to the real/integer type TYPE. Function returns true when: + * EXPR is a constant which cannot be exactly converted to TYPE EXPR + * is not a constant and size of EXPR's type > than size of TYPE, + for EXPR type and TYPE being both integers or both real. + * EXPR is not a constant of real type and TYPE is an integer. EXPR + * is not a constant of integer type which cannot be + exactly converted to real type. + Function allows conversions between types of different signedness and + does not return true in that case. Function can produce signedness + warnings if PRODUCE_WARNS is true. */ +bool +unsafe_conversion_p (tree type, tree expr, bool produce_warns) { bool give_warning = false; - - int i; - const int expr_num_operands = TREE_OPERAND_LENGTH (expr); tree expr_type = TREE_TYPE (expr); location_t loc = EXPR_LOC_OR_HERE (expr); - if (!warn_conversion && !warn_sign_conversion) - return; - - /* If any operand is artificial, then this expression was generated - by the compiler and we do not warn. */ - for (i = 0; i < expr_num_operands; i++) + if (TREE_CODE (expr) == REAL_CST || TREE_CODE (expr) == INTEGER_CST) { - tree op = TREE_OPERAND (expr, i); - if (op && DECL_P (op) && DECL_ARTIFICIAL (op)) - return; - } - - switch (TREE_CODE (expr)) - { - case EQ_EXPR: - case NE_EXPR: - case LE_EXPR: - case GE_EXPR: - case LT_EXPR: - case GT_EXPR: - case TRUTH_ANDIF_EXPR: - case TRUTH_ORIF_EXPR: - case TRUTH_AND_EXPR: - case TRUTH_OR_EXPR: - case TRUTH_XOR_EXPR: - case TRUTH_NOT_EXPR: - /* Conversion from boolean to a signed:1 bit-field (which only - can hold the values 0 and -1) doesn't lose information - but - it does change the value. */ - if (TYPE_PRECISION (type) == 1 && !TYPE_UNSIGNED (type)) - warning_at (loc, OPT_Wconversion, - "conversion to %qT from boolean expression", type); - return; - - case REAL_CST: - case INTEGER_CST: - /* Warn for real constant that is not an exact integer converted to integer type. */ if (TREE_CODE (expr_type) == REAL_TYPE @@ -1917,11 +1887,17 @@ conversion_warning (tree type, tree expr { if (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type) && tree_int_cst_sgn (expr) < 0) - warning_at (loc, OPT_Wsign_conversion, "negative integer" - " implicitly converted to unsigned type"); + { + if (produce_warns) + warning_at (loc, OPT_Wsign_conversion, "negative integer" + " implicitly converted to unsigned type"); + } else if (!TYPE_UNSIGNED (type) && TYPE_UNSIGNED (expr_type)) - warning_at (loc, OPT_Wsign_conversion, "conversion of unsigned" - " constant value to negative integer"); + { + if (produce_warns) + warning_at (loc, OPT_Wsign_conversion, "conversion of unsigned" + " constant value to negative integer"); + } else give_warning = true; } @@ -1944,36 +1920,9 @@ conversion_warning (tree type, tree expr give_warning = true; } } - - if (give_warning) - warning_at (loc, OPT_Wconversion, - "conversion to %qT alters %qT constant value", - type, expr_type); - - return; - - case COND_EXPR: - { - /* In case of COND_EXPR, if both operands are constants or - COND_EXPR, then we do not care about the type of COND_EXPR, - only about the conversion of each operand. */ - tree op1 = TREE_OPERAND (expr, 1); - tree op2 = TREE_OPERAND (expr, 2); - - if ((TREE_CODE (op1) == REAL_CST || TREE_CODE (op1) == INTEGER_CST - || TREE_CODE (op1) == COND_EXPR) - && (TREE_CODE (op2) == REAL_CST || TREE_CODE (op2) == INTEGER_CST - || TREE_CODE (op2) == COND_EXPR)) - { - conversion_warning (type, op1); - conversion_warning (type, op2); - return; - } - /* Fall through. */ - } - - default: /* 'expr' is not a constant. */ - + } + else + { /* Warn for real types converted to integer types. */ if (TREE_CODE (expr_type) == REAL_TYPE && TREE_CODE (type) == INTEGER_TYPE) @@ -1988,7 +1937,7 @@ conversion_warning (tree type, tree expr /* Don't warn for short y; short x = ((int)y & 0xff); */ if (TREE_CODE (expr) == BIT_AND_EXPR - || TREE_CODE (expr) == BIT_IOR_EXPR + || TREE_CODE (expr) == BIT_IOR_EXPR || TREE_CODE (expr) == BIT_XOR_EXPR) { /* If both args were extended from a shortest type, @@ -2015,7 +1964,7 @@ conversion_warning (tree type, tree expr && int_fits_type_p (op1, c_common_signed_type (type)) && int_fits_type_p (op1, c_common_unsigned_type (type)))) - return; + return false; /* If constant is unsigned and fits in the target type, then the result will also fit. */ else if ((TREE_CODE (op0) == INTEGER_CST @@ -2024,7 +1973,7 @@ conversion_warning (tree type, tree expr || (TREE_CODE (op1) == INTEGER_CST && unsigned1 && int_fits_type_p (op1, type))) - return; + return false; } } /* Warn for integer types converted to smaller integer types. */ @@ -2033,12 +1982,13 @@ conversion_warning (tree type, tree expr /* When they are the same width but different signedness, then the value may change. */ - else if ((TYPE_PRECISION (type) == TYPE_PRECISION (expr_type) + else if (((TYPE_PRECISION (type) == TYPE_PRECISION (expr_type) && TYPE_UNSIGNED (expr_type) != TYPE_UNSIGNED (type)) /* Even when converted to a bigger type, if the type is unsigned but expr is signed, then negative values will be changed. */ - || (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type))) + || (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type))) + && produce_warns) warning_at (loc, OPT_Wsign_conversion, "conversion to %qT from %qT " "may change the sign of the result", type, expr_type); @@ -2072,9 +2022,86 @@ conversion_warning (tree type, tree expr && TREE_CODE (type) == REAL_TYPE && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type)) give_warning = true; + } + + return give_warning; +} + +/* Warns if the conversion of EXPR to TYPE may alter a value. + This is a helper function for warnings_for_convert_and_check. */ + +static void +conversion_warning (tree type, tree expr) +{ + int i; + const int expr_num_operands = TREE_OPERAND_LENGTH (expr); + tree expr_type = TREE_TYPE (expr); + location_t loc = EXPR_LOC_OR_HERE (expr); + + if (!warn_conversion && !warn_sign_conversion) + return; + + /* If any operand is artificial, then this expression was generated + by the compiler and we do not warn. */ + for (i = 0; i < expr_num_operands; i++) + { + tree op = TREE_OPERAND (expr, i); + if (op && DECL_P (op) && DECL_ARTIFICIAL (op)) + return; + } + + switch (TREE_CODE (expr)) + { + case EQ_EXPR: + case NE_EXPR: + case LE_EXPR: + case GE_EXPR: + case LT_EXPR: + case GT_EXPR: + case TRUTH_ANDIF_EXPR: + case TRUTH_ORIF_EXPR: + case TRUTH_AND_EXPR: + case TRUTH_OR_EXPR: + case TRUTH_XOR_EXPR: + case TRUTH_NOT_EXPR: + /* Conversion from boolean to a signed:1 bit-field (which only + can hold the values 0 and -1) doesn't lose information - but + it does change the value. */ + if (TYPE_PRECISION (type) == 1 && !TYPE_UNSIGNED (type)) + warning_at (loc, OPT_Wconversion, + "conversion to %qT from boolean expression", type); + return; + case REAL_CST: + case INTEGER_CST: + if (unsafe_conversion_p (type, expr, true)) + warning_at (loc, OPT_Wconversion, + "conversion to %qT alters %qT constant value", + type, expr_type); + return; - if (give_warning) + case COND_EXPR: + { + /* In case of COND_EXPR, if both operands are constants or + COND_EXPR, then we do not care about the type of COND_EXPR, + only about the conversion of each operand. */ + tree op1 = TREE_OPERAND (expr, 1); + tree op2 = TREE_OPERAND (expr, 2); + + if ((TREE_CODE (op1) == REAL_CST || TREE_CODE (op1) == INTEGER_CST + || TREE_CODE (op1) == COND_EXPR) + && (TREE_CODE (op2) == REAL_CST || TREE_CODE (op2) == INTEGER_CST + || TREE_CODE (op2) == COND_EXPR)) + { + conversion_warning (type, op1); + conversion_warning (type, op2); + return; + } + /* Fall through. */ + } + + default: /* 'expr' is not a constant. */ + if (unsafe_conversion_p (type, expr, true)) warning_at (loc, OPT_Wconversion, "conversion to %qT from %qT may alter its value", type, expr_type); Index: gcc/c-family/c-common.h =================================================================== --- gcc/c-family/c-common.h (revision 166433) +++ gcc/c-family/c-common.h (working copy) @@ -706,6 +706,7 @@ extern tree c_common_unsigned_type (tree extern tree c_common_signed_type (tree); extern tree c_common_signed_or_unsigned_type (int, tree); extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int); +extern bool unsafe_conversion_p (tree, tree, bool); extern bool decl_with_nonnull_addr_p (const_tree); extern tree c_fully_fold (tree, bool, bool *); extern tree decl_constant_value_for_optimization (tree); Index: gcc/testsuite/gcc.c-torture/execute/scal-to-vec1.c =================================================================== --- gcc/testsuite/gcc.c-torture/execute/scal-to-vec1.c (revision 0) +++ gcc/testsuite/gcc.c-torture/execute/scal-to-vec1.c (revision 0) @@ -0,0 +1,85 @@ +#define vector(elcount, type) \ +__attribute__((vector_size((elcount)*sizeof(type)))) type + +#define vidx(type, vec, idx) (*((type *) &(vec) + idx)) + +#define operl(a, b, op) (a op b) +#define operr(a, b, op) (b op a) + +#define check(type, count, vec0, vec1, num, op, lr) \ +do {\ + int __i; \ + for (__i = 0; __i < count; __i++) {\ + if (vidx (type, vec1, __i) != oper##lr (num, vidx (type, vec0, __i), op)) \ + __builtin_abort (); \ + }\ +} while (0) + +#define veccompare(type, count, v0, v1) \ +do {\ + int __i; \ + for (__i = 0; __i < count; __i++) { \ + if (vidx (type, v0, __i) != vidx (type, v1, __i)) \ + __builtin_abort (); \ + } \ +} while (0) + + +int main (int argc, char *argv[]) { +#define fvec_2 (vector(4, float)){2., 2., 2., 2.} +#define dvec_2 (vector(2, double)){2., 2.} + + + vector(8, short) v0 = {argc, 1,2,3,4,5,6,7}; + vector(8, short) v1; + + vector(4, float) f0 = {1., 2., 3., 4.}; + vector(4, float) f1, f2; + + vector(2, double) d0 = {1., 2.}; + vector(2, double) d1, d2; + + + + v1 = 2 + v0; check (short, 8, v0, v1, 2, +, l); + v1 = 2 - v0; check (short, 8, v0, v1, 2, -, l); + v1 = 2 * v0; check (short, 8, v0, v1, 2, *, l); + v1 = 2 / v0; check (short, 8, v0, v1, 2, /, l); + v1 = 2 % v0; check (short, 8, v0, v1, 2, %, l); + v1 = 2 ^ v0; check (short, 8, v0, v1, 2, ^, l); + v1 = 2 & v0; check (short, 8, v0, v1, 2, &, l); + v1 = 2 | v0; check (short, 8, v0, v1, 2, |, l); + v1 = 2 << v0; check (short, 8, v0, v1, 2, <<, l); + v1 = 2 >> v0; check (short, 8, v0, v1, 2, >>, l); + + v1 = v0 + 2; check (short, 8, v0, v1, 2, +, r); + v1 = v0 - 2; check (short, 8, v0, v1, 2, -, r); + v1 = v0 * 2; check (short, 8, v0, v1, 2, *, r); + v1 = v0 / 2; check (short, 8, v0, v1, 2, /, r); + v1 = v0 % 2; check (short, 8, v0, v1, 2, %, r); + v1 = v0 ^ 2; check (short, 8, v0, v1, 2, ^, r); + v1 = v0 & 2; check (short, 8, v0, v1, 2, &, r); + v1 = v0 | 2; check (short, 8, v0, v1, 2, |, r); + + f1 = 2. + f0; f2 = fvec_2 + f0; veccompare (float, 4, f1, f2); + f1 = 2. - f0; f2 = fvec_2 - f0; veccompare (float, 4, f1, f2); + f1 = 2. * f0; f2 = fvec_2 * f0; veccompare (float, 4, f1, f2); + f1 = 2. / f0; f2 = fvec_2 / f0; veccompare (float, 4, f1, f2); + + f1 = f0 + 2.; f2 = f0 + fvec_2; veccompare (float, 4, f1, f2); + f1 = f0 - 2.; f2 = f0 - fvec_2; veccompare (float, 4, f1, f2); + f1 = f0 * 2.; f2 = f0 * fvec_2; veccompare (float, 4, f1, f2); + f1 = f0 / 2.; f2 = f0 / fvec_2; veccompare (float, 4, f1, f2); + + d1 = 2. + d0; d2 = dvec_2 + d0; veccompare (double, 2, d1, d2); + d1 = 2. - d0; d2 = dvec_2 - d0; veccompare (double, 2, d1, d2); + d1 = 2. * d0; d2 = dvec_2 * d0; veccompare (double, 2, d1, d2); + d1 = 2. / d0; d2 = dvec_2 / d0; veccompare (double, 2, d1, d2); + + d1 = d0 + 2.; d2 = d0 + dvec_2; veccompare (double, 2, d1, d2); + d1 = d0 - 2.; d2 = d0 - dvec_2; veccompare (double, 2, d1, d2); + d1 = d0 * 2.; d2 = d0 * dvec_2; veccompare (double, 2, d1, d2); + d1 = d0 / 2.; d2 = d0 / dvec_2; veccompare (double, 2, d1, d2); + + return 0; +} Index: gcc/testsuite/gcc.c-torture/execute/scal-to-vec3.c =================================================================== --- gcc/testsuite/gcc.c-torture/execute/scal-to-vec3.c (revision 0) +++ gcc/testsuite/gcc.c-torture/execute/scal-to-vec3.c (revision 0) @@ -0,0 +1,48 @@ +#define vector(elcount, type) \ +__attribute__((vector_size((elcount)*sizeof(type)))) type + +#define vidx(type, vec, idx) (*((type *) &(vec) + idx)) + +#define veccompare(type, count, v0, v1) \ +do {\ + int __i; \ + for (__i = 0; __i < count; __i++) { \ + if (vidx (type, v0, __i) != vidx (type, v1, __i)) \ + __builtin_abort (); \ + } \ +} while (0) + + +int main (int argc, char *argv[]) { +#define fvec_2 (vector(4, float)){2., 2., 2., 2.} +#define dvec_2 (vector(2, double)){2., 2.} + + vector(4, float) f0 = {1., 2., 3., 4.}; + vector(4, float) f1, f2; + + vector(2, double) d0 = {1., 2.}; + vector(2, double) d1, d2; + + + f1 = 2 + f0; f2 = fvec_2 + f0; veccompare (float, 4, f1, f2); + f1 = 2 - f0; f2 = fvec_2 - f0; veccompare (float, 4, f1, f2); + f1 = 2 * f0; f2 = fvec_2 * f0; veccompare (float, 4, f1, f2); + f1 = 2 / f0; f2 = fvec_2 / f0; veccompare (float, 4, f1, f2); + + f1 = f0 + 2; f2 = f0 + fvec_2; veccompare (float, 4, f1, f2); + f1 = f0 - 2; f2 = f0 - fvec_2; veccompare (float, 4, f1, f2); + f1 = f0 * 2; f2 = f0 * fvec_2; veccompare (float, 4, f1, f2); + f1 = f0 / 2; f2 = f0 / fvec_2; veccompare (float, 4, f1, f2); + + d1 = 2 + d0; d2 = dvec_2 + d0; veccompare (double, 2, d1, d2); + d1 = 2 - d0; d2 = dvec_2 - d0; veccompare (double, 2, d1, d2); + d1 = 2 * d0; d2 = dvec_2 * d0; veccompare (double, 2, d1, d2); + d1 = 2 / d0; d2 = dvec_2 / d0; veccompare (double, 2, d1, d2); + + d1 = d0 + 2; d2 = d0 + dvec_2; veccompare (double, 2, d1, d2); + d1 = d0 - 2; d2 = d0 - dvec_2; veccompare (double, 2, d1, d2); + d1 = d0 * 2; d2 = d0 * dvec_2; veccompare (double, 2, d1, d2); + d1 = d0 / 2; d2 = d0 / dvec_2; veccompare (double, 2, d1, d2); + + return 0; +} Index: gcc/testsuite/gcc.c-torture/execute/scal-to-vec2.c =================================================================== --- gcc/testsuite/gcc.c-torture/execute/scal-to-vec2.c (revision 0) +++ gcc/testsuite/gcc.c-torture/execute/scal-to-vec2.c (revision 0) @@ -0,0 +1,62 @@ +#define vector(elcount, type) \ +__attribute__((vector_size((elcount)*sizeof(type)))) type + +#define vidx(type, vec, idx) (*((type *) &(vec) + idx)) + +#define operl(a, b, op) (a op b) +#define operr(a, b, op) (b op a) + +#define check(type, count, vec0, vec1, num, op, lr) \ +do {\ + int __i; \ + for (__i = 0; __i < count; __i++) {\ + if (vidx (type, vec1, __i) != oper##lr (num, vidx (type, vec0, __i), op)) \ + __builtin_abort (); \ + }\ +} while (0) + +#define veccompare(type, count, v0, v1) \ +do {\ + int __i; \ + for (__i = 0; __i < count; __i++) { \ + if (vidx (type, v0, __i) != vidx (type, v1, __i)) \ + __builtin_abort (); \ + } \ +} while (0) + + +long __attribute__ ((noinline)) vlng () { return (long)42; } +int __attribute__ ((noinline)) vint () { return (int) 43; } +short __attribute__ ((noinline)) vsrt () { return (short)42; } +char __attribute__ ((noinline)) vchr () { return (char)42; } + + +int main (int argc, char *argv[]) { + vector(16, char) c0 = {argc, 1,2,3,4,5,6,7, argc, 1,2,3,4,5,6,7}; + vector(16, char) c1; + + vector(8, short) s0 = {argc, 1,2,3,4,5,6,7}; + vector(8, short) s1; + + vector(4, int) i0 = {argc, 1, 2, 3}; + vector(4, int) i1; + + vector(2, long) l0 = {argc, 1}; + vector(2, long) l1; + + c1 = vchr() + c0; check (char, 16, c0, c1, vchr(), +, l); + + s1 = vsrt() + s0; check (short, 8, s0, s1, vsrt(), +, l); + s1 = vchr() + s0; check (short, 8, s0, s1, vchr(), +, l); + + i1 = vint() * i0; check (int, 4, i0, i1, vint(), *, l); + i1 = vsrt() * i0; check (int, 4, i0, i1, vsrt(), *, l); + i1 = vchr() * i0; check (int, 4, i0, i1, vchr(), *, l); + + l1 = vlng() * l0; check (long, 2, l0, l1, vlng(), *, l); + l1 = vint() * l0; check (long, 2, l0, l1, vint(), *, l); + l1 = vsrt() * l0; check (long, 2, l0, l1, vsrt(), *, l); + l1 = vchr() * l0; check (long, 2, l0, l1, vchr(), *, l); + + return 0; +} Index: gcc/testsuite/gcc.dg/scal-to-vec1.c =================================================================== --- gcc/testsuite/gcc.dg/scal-to-vec1.c (revision 0) +++ gcc/testsuite/gcc.dg/scal-to-vec1.c (revision 0) @@ -0,0 +1,41 @@ +/* { dg-do compile } */ +/* { dg-options "-Wno-long-long" } */ +#define vector(elcount, type) \ +__attribute__((vector_size((elcount)*sizeof(type)))) type + +#define vidx(type, vec, idx) (*((type *) &(vec) + idx)) + + +extern float sfl; +extern int sint; +extern long long sll; + +int main (int argc, char *argv[]) { + vector(8, short) v0 = {argc, 1,2,3,4,5,6,7}; + vector(8, short) v1; + + vector(4, float) f0 = {1., 2., 3., 4.}; + vector(4, float) f1, f2; + + vector(4, int) i0 = {1,2,3,4}; + vector(4, int) i1, i2; + + + int i = 12; + double d = 3.; + + v1 = i + v0; /* { dg-error "conversion of scalar to vector" } */ + v1 = 99999 + v0; /* { dg-error "conversion of scalar to vector" } */ + + f1 = d + f0; /* { dg-error "conversion of scalar to vector" } */ + f1 = 1.3 + f0; /* { dg-error "conversion of scalar to vector" } */ + f1 = sll + f0; /* { dg-error "conversion of scalar to vector" } */ + + /* convert.c should take care of this. */ + i1 = sfl + i0; /* { dg-error "can't convert value to a vector" } */ + i1 = 1.5 + i0; /* { dg-error "can't convert value to a vector" } */ + v1 = d + v0; /* { dg-error "can't convert value to a vector" } */ + + + return 0; +} Index: gcc/c-typeck.c =================================================================== --- gcc/c-typeck.c (revision 166433) +++ gcc/c-typeck.c (working copy) @@ -51,6 +51,14 @@ enum impl_conv { ic_return }; +/* Possibe cases of scalar_to_vector conversion. */ +enum stv_conv { + stv_error, /* Error occured. */ + stv_nothing, /* Nothing happened. */ + stv_firstarg, /* First argument must be expanded. */ + stv_secondarg /* Second argument must be expanded. */ +}; + /* Whether we are building a boolean conversion inside convert_for_assignment, or some other late binary operation. If build_binary_op is called (from code shared with C++) in this case, @@ -9387,6 +9395,88 @@ push_cleanup (tree decl, tree cleanup, b TREE_OPERAND (stmt, 0) = list; STATEMENT_LIST_STMT_EXPR (list) = stmt_expr; } + +/* Convert scalar to vector for the range of operations. */ +static enum stv_conv +scalar_to_vector (location_t loc, enum tree_code code, tree op0, tree op1) +{ + tree type0 = TREE_TYPE (op0); + tree type1 = TREE_TYPE (op1); + bool integer_only_op = false; + enum stv_conv ret = stv_firstarg; + + gcc_assert (TREE_CODE (type0) == VECTOR_TYPE + || TREE_CODE (type1) == VECTOR_TYPE); + switch (code) + { + case RSHIFT_EXPR: + case LSHIFT_EXPR: + if (TREE_CODE (type0) == INTEGER_TYPE + && TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE) + { + if (unsafe_conversion_p (TREE_TYPE (type1), op0, false)) + { + error_at (loc, "conversion of scalar to vector " + "involves truncation"); + return stv_error; + } + else + return stv_firstarg; + } + break; + + case BIT_IOR_EXPR: + case BIT_XOR_EXPR: + case BIT_AND_EXPR: + integer_only_op = true; + /* ... fall through ... */ + + case PLUS_EXPR: + case MINUS_EXPR: + case MULT_EXPR: + case TRUNC_DIV_EXPR: + case TRUNC_MOD_EXPR: + case RDIV_EXPR: + if (TREE_CODE (type0) == VECTOR_TYPE) + { + tree tmp; + ret = stv_secondarg; + /* Swap TYPE0 with TYPE1 and OP0 with OP1 */ + tmp = type0; type0 = type1; type1 = tmp; + tmp = op0; op0 = op1; op1 = tmp; + } + + if (TREE_CODE (type0) == INTEGER_TYPE + && TREE_CODE (TREE_TYPE (type1)) == INTEGER_TYPE) + { + if (unsafe_conversion_p (TREE_TYPE (type1), op0, false)) + { + error_at (loc, "conversion of scalar to vector " + "involves truncation"); + return stv_error; + } + return ret; + } + else if (!integer_only_op + /* Allow integer --> real conversion if safe. */ + && (TREE_CODE (type0) == REAL_TYPE + || TREE_CODE (type0) == INTEGER_TYPE) + && SCALAR_FLOAT_TYPE_P (TREE_TYPE (type1))) + { + if (unsafe_conversion_p (TREE_TYPE (type1), op0, false)) + { + error_at (loc, "conversion of scalar to vector " + "involves truncation"); + return stv_error; + } + return ret; + } + default: + break; + } + + return stv_nothing; +} /* Build a binary-operation expression without default conversions. CODE is the kind of expression to build. @@ -9498,7 +9588,10 @@ build_binary_op (location_t location, en else int_const = int_const_or_overflow = false; - if (convert_p) + /* Do not apply default conversion in mixed vector/scalar expression. */ + if (convert_p + && !((TREE_CODE (TREE_TYPE (op0)) == VECTOR_TYPE) + != (TREE_CODE (TREE_TYPE (op1)) == VECTOR_TYPE))) { op0 = default_conversion (op0); op1 = default_conversion (op1); @@ -9570,6 +9663,41 @@ build_binary_op (location_t location, en objc_ok = objc_compare_types (type0, type1, -3, NULL_TREE); + /* In case when one of the operands of the binary operation is + a vector and another is a scalar -- convert scalar to vector. */ + if ((code0 == VECTOR_TYPE) != (code1 == VECTOR_TYPE)) + { + enum stv_conv convert_flag = scalar_to_vector (location, code, op0, op1); + + switch (convert_flag) + { + case stv_error: + return error_mark_node; + case stv_firstarg: + { + tree sc = save_expr (op0); + sc = convert (TREE_TYPE (type1), sc); + op0 = build_vector_from_val (type1, sc); + orig_type0 = type0 = TREE_TYPE (op0); + code0 = TREE_CODE (type0); + converted = 1; + break; + } + case stv_secondarg: + { + tree sc = save_expr (op1); + sc = convert (TREE_TYPE (type0), sc); + op1 = build_vector_from_val (type0, sc); + orig_type1 = type1 = TREE_TYPE (op1); + code1 = TREE_CODE (type1); + converted = 1; + break; + } + default: + break; + } + } + switch (code) { case PLUS_EXPR: