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gcc48.149
gcc48-ppc64le-abi-warnings.diff
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File gcc48-ppc64le-abi-warnings.diff of Package gcc48.149
2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> * config/rs6000/rs6000-protos.h (rs6000_special_adjust_field_align_p): Add prototype. * config/rs6000/rs6000.c (rs6000_special_adjust_field_align_p): New function. Issue -Wpsabi warning if future GCC releases will use different field alignment rules for this type. * config/rs6000/sysv4.h (ADJUST_FIELD_ALIGN): Call it. * config/rs6000/linux64.h (ADJUST_FIELD_ALIGN): Likewise. * config/rs6000/freebsd64.h (ADJUST_FIELD_ALIGN): Likewise. 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> * config/rs6000/rs6000.c (rs6000_function_arg_boundary): Issue -Wpsabi note when encountering a type where future GCC releases will apply different alignment requirements. 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> * config/rs6000/rs6000.c (rs6000_function_arg): If a float argument does not fit fully into floating-point registers, and there is still space in the register parameter area, issue -Wpsabi note that the ABI will change in a future GCC release. 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> Backport from mainline: 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> * gcc.target/powerpc/ppc64-abi-warn-3.c: New test. * gcc.c-torture/execute/20050316-1.x: Add -Wno-psabi. * gcc.c-torture/execute/20050604-1.x: Add -Wno-psabi. * gcc.c-torture/execute/20050316-3.x: New file. Add -Wno-psabi. * gcc.c-torture/execute/pr23135.x: Likewise. 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> Backport from mainline: 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> * gcc.target/powerpc/ppc64-abi-warn-2.c: New test. 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> Backport from mainline: 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> * gcc.target/powerpc/ppc64-abi-warn-1.c: New test. 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> Backport from mainline: 2014-07-24 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> * g++.dg/compat/struct-layout-1.exp: Load g++-dg.exp. Index: gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-1.c =================================================================== --- gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-1.c (revision 0) +++ gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-1.c (revision 213025) @@ -0,0 +1,12 @@ +/* { dg-do compile { target { powerpc*-*-linux* && lp64 } } } */ +/* { dg-options "-mabi=elfv2" } */ + +struct f8 + { + float x[8]; + }; + +void test (struct f8 a, struct f8 b) /* { dg-message "note: the ABI of passing homogeneous float aggregates will change" } */ +{ +} + Index: gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-2.c =================================================================== --- gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-2.c (revision 0) +++ gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-2.c (revision 213025) @@ -0,0 +1,12 @@ +/* { dg-do compile { target { powerpc*-*-linux* && lp64 } } } */ +/* { dg-options "-mno-compat-align-parm" } */ + +struct test + { + long a __attribute__((aligned (16))); + }; + +void test (struct test a) /* { dg-message "note: the ABI of passing aggregates with 16-byte alignment will change" } */ +{ +} + Index: gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-3.c =================================================================== --- gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-3.c (revision 0) +++ gcc/testsuite/gcc.target/powerpc/ppc64-abi-warn-3.c (revision 213025) @@ -0,0 +1,9 @@ +/* { dg-do compile { target { powerpc*-*-linux* && lp64 } } } */ +/* { dg-require-effective-target powerpc_altivec_ok } */ +/* { dg-options "-maltivec" } */ + +struct test + { + int a __attribute__((vector_size (8))); + }; /* { dg-message "note: the layout of aggregates containing vectors with 8-byte alignment will change" } */ + Index: gcc/testsuite/gcc.c-torture/execute/pr23135.x =================================================================== --- gcc/testsuite/gcc.c-torture/execute/pr23135.x (revision 0) +++ gcc/testsuite/gcc.c-torture/execute/pr23135.x (revision 213025) @@ -0,0 +1,2 @@ +set additional_flags "-Wno-psabi" +return 0 Index: gcc/testsuite/gcc.c-torture/execute/20050604-1.x =================================================================== --- gcc/testsuite/gcc.c-torture/execute/20050604-1.x (revision 213021) +++ gcc/testsuite/gcc.c-torture/execute/20050604-1.x (revision 213025) @@ -6,4 +6,5 @@ if { [istarget "i?86-*-*"] || [istarget set additional_flags "-mno-mmx" } +set additional_flags "-Wno-psabi" return 0 Index: gcc/testsuite/gcc.c-torture/execute/20050316-1.x =================================================================== --- gcc/testsuite/gcc.c-torture/execute/20050316-1.x (revision 213021) +++ gcc/testsuite/gcc.c-torture/execute/20050316-1.x (revision 213025) @@ -4,4 +4,5 @@ if { [check_effective_target_int16] } { return 1 } +set additional_flags "-Wno-psabi" return 0; Index: gcc/testsuite/gcc.c-torture/execute/20050316-3.x =================================================================== --- gcc/testsuite/gcc.c-torture/execute/20050316-3.x (revision 0) +++ gcc/testsuite/gcc.c-torture/execute/20050316-3.x (revision 213025) @@ -0,0 +1,2 @@ +set additional_flags "-Wno-psabi" +return 0 Index: gcc/testsuite/g++.dg/compat/struct-layout-1.exp =================================================================== --- gcc/testsuite/g++.dg/compat/struct-layout-1.exp (revision 213021) +++ gcc/testsuite/g++.dg/compat/struct-layout-1.exp (revision 213025) @@ -89,6 +89,9 @@ proc compat-use-tst-compiler { } { # This must be done after the compat-use-*-compiler definitions. load_lib compat.exp +# Provide the g++-dg-prune routine (gcc-dp.exp is loaded by compat.exp) +load_lib g++-dg.exp + g++_init # Save variables for the C++ compiler under test, which each test will Index: gcc/config/rs6000/freebsd64.h =================================================================== --- gcc/config/rs6000/freebsd64.h (revision 213021) +++ gcc/config/rs6000/freebsd64.h (revision 213025) @@ -367,7 +367,7 @@ extern int dot_symbols; /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given. */ #undef ADJUST_FIELD_ALIGN #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ - ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE) \ + (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED)) \ ? 128 \ : (TARGET_64BIT \ && TARGET_ALIGN_NATURAL == 0 \ Index: gcc/config/rs6000/rs6000-protos.h =================================================================== --- gcc/config/rs6000/rs6000-protos.h (revision 213021) +++ gcc/config/rs6000/rs6000-protos.h (revision 213025) @@ -153,6 +153,7 @@ extern void rs6000_split_logical (rtx [] #ifdef TREE_CODE extern unsigned int rs6000_data_alignment (tree, unsigned int, enum data_align); +extern bool rs6000_special_adjust_field_align_p (tree, unsigned int); extern unsigned int rs6000_special_round_type_align (tree, unsigned int, unsigned int); extern unsigned int darwin_rs6000_special_round_type_align (tree, unsigned int, Index: gcc/config/rs6000/linux64.h =================================================================== --- gcc/config/rs6000/linux64.h (revision 213021) +++ gcc/config/rs6000/linux64.h (revision 213025) @@ -246,7 +246,7 @@ extern int dot_symbols; /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given. */ #undef ADJUST_FIELD_ALIGN #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ - ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE) \ + (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED)) \ ? 128 \ : (TARGET_64BIT \ && TARGET_ALIGN_NATURAL == 0 \ Index: gcc/config/rs6000/rs6000.c =================================================================== --- gcc/config/rs6000/rs6000.c (revision 213021) +++ gcc/config/rs6000/rs6000.c (revision 213025) @@ -5862,6 +5862,34 @@ rs6000_data_alignment (tree type, unsign return align; } +/* Previous GCC releases forced all vector types to have 16-byte alignment. */ + +bool +rs6000_special_adjust_field_align_p (tree field, unsigned int computed) +{ + if (TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (field)) == VECTOR_TYPE) + { + if (computed != 128) + { + static bool warned; + if (!warned && warn_psabi) + { + warned = true; + inform (input_location, + "the layout of aggregates containing vectors with" + " %d-byte alignment will change in a future GCC release", + computed / BITS_PER_UNIT); + } + } + /* GCC 4.8/4.9 Note: To avoid any ABI change on a release branch, we + keep the special treatment of vector types, but warn if there will + be differences in future GCC releases. */ + return true; + } + + return false; +} + /* AIX increases natural record alignment to doubleword if the first field is an FP double while the FP fields remain word aligned. */ @@ -9200,14 +9228,51 @@ rs6000_function_arg_boundary (enum machi || (type && TREE_CODE (type) == VECTOR_TYPE && int_size_in_bytes (type) >= 16)) return 128; - else if (((TARGET_MACHO && rs6000_darwin64_abi) - || DEFAULT_ABI == ABI_ELFv2 - || (DEFAULT_ABI == ABI_AIX && !rs6000_compat_align_parm)) - && mode == BLKmode - && type && TYPE_ALIGN (type) > 64) + + /* Aggregate types that need > 8 byte alignment are quadword-aligned + in the parameter area in the ELFv2 ABI, and in the AIX ABI unless + -mcompat-align-parm is used. */ + if (((DEFAULT_ABI == ABI_AIX && !rs6000_compat_align_parm) + || DEFAULT_ABI == ABI_ELFv2) + && type && TYPE_ALIGN (type) > 64) + { + /* "Aggregate" means any AGGREGATE_TYPE except for single-element + or homogeneous float/vector aggregates here. We already handled + vector aggregates above, but still need to check for float here. */ + bool aggregate_p = (AGGREGATE_TYPE_P (type) + && !SCALAR_FLOAT_MODE_P (elt_mode)); + + /* We used to check for BLKmode instead of the above aggregate type + check. Warn when this results in any difference to the ABI. */ + if (aggregate_p != (mode == BLKmode)) + { + static bool warned; + if (!warned && warn_psabi) + { + warned = true; + inform (input_location, + "the ABI of passing aggregates with %d-byte alignment" + " will change in a future GCC release", + (int) TYPE_ALIGN (type) / BITS_PER_UNIT); + } + } + + /* GCC 4.8/4.9 Note: To avoid any ABI change on a release branch, we + keep using the BLKmode check, but warn if there will be differences + in future GCC releases. */ + if (mode == BLKmode) + return 128; + } + + /* Similar for the Darwin64 ABI. Note that for historical reasons we + implement the "aggregate type" check as a BLKmode check here; this + means certain aggregate types are in fact not aligned. */ + if (TARGET_MACHO && rs6000_darwin64_abi + && mode == BLKmode + && type && TYPE_ALIGN (type) > 64) return 128; - else - return PARM_BOUNDARY; + + return PARM_BOUNDARY; } /* The offset in words to the start of the parameter save area. */ @@ -10245,6 +10310,7 @@ rs6000_function_arg (cumulative_args_t c rtx r, off; int i, k = 0; unsigned long n_fpreg = (GET_MODE_SIZE (elt_mode) + 7) >> 3; + int fpr_words; /* Do we also need to pass this argument in the parameter save area? */ @@ -10273,6 +10339,37 @@ rs6000_function_arg (cumulative_args_t c rvec[k++] = gen_rtx_EXPR_LIST (VOIDmode, r, off); } + /* If there were not enough FPRs to hold the argument, the rest + usually goes into memory. However, if the current position + is still within the register parameter area, a portion may + actually have to go into GPRs. + + Note that it may happen that the portion of the argument + passed in the first "half" of the first GPR was already + passed in the last FPR as well. + + For unnamed arguments, we already set up GPRs to cover the + whole argument in rs6000_psave_function_arg, so there is + nothing further to do at this point. + + GCC 4.8/4.9 Note: This was implemented incorrectly in earlier + GCC releases. To avoid any ABI change on the release branch, + we retain that original implementation here, but warn if we + encounter a case where the ABI will change in the future. */ + fpr_words = (i * GET_MODE_SIZE (elt_mode)) / (TARGET_32BIT ? 4 : 8); + if (i < n_elts && align_words + fpr_words < GP_ARG_NUM_REG + && cum->nargs_prototype > 0) + { + static bool warned; + if (!warned && warn_psabi) + { + warned = true; + inform (input_location, + "the ABI of passing homogeneous float aggregates" + " will change in a future GCC release"); + } + } + return rs6000_finish_function_arg (mode, rvec, k); } else if (align_words < GP_ARG_NUM_REG) Index: gcc/config/rs6000/sysv4.h =================================================================== --- gcc/config/rs6000/sysv4.h (revision 213021) +++ gcc/config/rs6000/sysv4.h (revision 213025) @@ -292,7 +292,7 @@ do { \ /* An expression for the alignment of a structure field FIELD if the alignment computed in the usual way is COMPUTED. */ #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ - ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE) \ + (rs6000_special_adjust_field_align_p ((FIELD), (COMPUTED)) \ ? 128 : COMPUTED) #undef BIGGEST_FIELD_ALIGNMENT
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