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File _service:tar_scm:0059-Explicitly-view_convert_expr-mask-to-signed-type-whe.patch of Package gcc
From e70fa730dcfcb3a7b1d56a2e166752d4299f0504 Mon Sep 17 00:00:00 2001 From: liuhongt <hongtao.liu@intel.com> Date: Mon, 5 Jun 2023 12:38:41 +0800 Subject: [PATCH 04/32] Explicitly view_convert_expr mask to signed type when folding pblendvb builtins. Since mask < 0 will be always false for vector char when -funsigned-char, but vpblendvb needs to check the most significant bit. The patch explicitly VCE to vector signed char. gcc/ChangeLog: PR target/110108 * config/i386/i386.cc (ix86_gimple_fold_builtin): Explicitly view_convert_expr mask to signed type when folding pblendvb builtins. gcc/testsuite/ChangeLog: * gcc.target/i386/pr110108-2.c: New test. --- gcc/config/i386/i386.cc | 4 +++- gcc/testsuite/gcc.target/i386/pr110108-2.c | 14 ++++++++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.target/i386/pr110108-2.c diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc index 462dce10e..479fc6010 100644 --- a/gcc/config/i386/i386.cc +++ b/gcc/config/i386/i386.cc @@ -18396,8 +18396,10 @@ ix86_gimple_fold_builtin (gimple_stmt_iterator *gsi) tree itype = GET_MODE_INNER (TYPE_MODE (type)) == E_SFmode ? intSI_type_node : intDI_type_node; type = get_same_sized_vectype (itype, type); - arg2 = gimple_build (&stmts, VIEW_CONVERT_EXPR, type, arg2); } + else + type = signed_type_for (type); + arg2 = gimple_build (&stmts, VIEW_CONVERT_EXPR, type, arg2); tree zero_vec = build_zero_cst (type); tree cmp_type = truth_type_for (type); tree cmp = gimple_build (&stmts, LT_EXPR, cmp_type, arg2, zero_vec); diff --git a/gcc/testsuite/gcc.target/i386/pr110108-2.c b/gcc/testsuite/gcc.target/i386/pr110108-2.c new file mode 100644 index 000000000..2d1d2fd49 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr110108-2.c @@ -0,0 +1,14 @@ +/* { dg-do compile } */ +/* { dg-options "-mavx2 -O2 -funsigned-char" } */ +/* { dg-final { scan-assembler-times "vpblendvb" 2 } } */ + +#include <immintrin.h> +__m128i do_stuff_128(__m128i X0, __m128i X1, __m128i X2) { + __m128i Result = _mm_blendv_epi8(X0, X1, X2); + return Result; +} + +__m256i do_stuff_256(__m256i X0, __m256i X1, __m256i X2) { + __m256i Result = _mm256_blendv_epi8(X0, X1, X2); + return Result; +} -- 2.28.0.windows.1
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