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From: "deodharvinit99 at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/111683] New: Incorrect answer when using SSE2 intrinsics with -O3 Date: Tue, 03 Oct 2023 18:27:16 +0000 [thread overview] Message-ID: <bug-111683-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111683 Bug ID: 111683 Summary: Incorrect answer when using SSE2 intrinsics with -O3 Product: gcc Version: 10.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: deodharvinit99 at gmail dot com Target Milestone: --- Created attachment 56042 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56042&action=edit convn_script g++ produces incorrect answers when SSE2 intrinsics are used with -O3. -O2 produces same answers compared to an equivalent code written without SSE2 A standalone repro shell script: g++ -O2 convn_script.cpp ./a.out g++ -O3 convn_script.cpp ./a.out Target: x86_64-linux-gnu gcc version 10.2.1 20210110 (Debian 10.2.1-6) covn_script.cpp: #include <cstring> #include <emmintrin.h> #include <iostream> // Function Definitions // // Check properties of input in9 // // Arguments : const double in9[10] // const double in10[7] // double out5[16] // Return Type : void // void convn_script(const double in9[10], const double in10[7], double out5[16]) { int iB; int iC; // Check properties of input in10 std::memset(&out5[0], 0, 16U * sizeof(double)); iC = 0; iB = 0; for (int i{0}; i < 7; i++) { int b_i; int vectorUB; if (i + 10 <= 15) { b_i = 9; } else { b_i = 15 - i; } vectorUB = (((b_i + 1) / 2) << 1) - 2; for (int r{0}; r <= vectorUB; r += 2) { __m128d b_r; b_i = iC + r; b_r = _mm_loadu_pd(&out5[b_i]); _mm_storeu_pd(&out5[b_i], _mm_add_pd(b_r, _mm_mul_pd(_mm_set1_pd(in10[iB]), _mm_loadu_pd(&in9[r])))); } iC = iB + 1; iB++; } } int main() { double in9[10] = {0.8147, 0.9058, 0.1270, 0.9134, 0.6324, 0.0975, 0.2785, 0.5469, 0.9575, 0.9649}; double in10[7] = { 0.1576, 0.9706, 0.9572, 0.4854, 0.8003, 0.1419, 0.4218}; double out5[16]; convn_script(in9, in10, out5); for(int i = 0; i < 16; i++) { std::cout << "Out[" << i << "] = " << out5[i] << "\n"; } }
next reply other threads:[~2023-10-03 18:27 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-10-03 18:27 deodharvinit99 at gmail dot com [this message] 2023-10-03 22:18 ` [Bug middle-end/111683] [11/12/13/14 Regression] " pinskia at gcc dot gnu.org 2023-10-04 9:55 ` rguenth at gcc dot gnu.org 2023-10-04 16:56 ` amonakov at gcc dot gnu.org 2023-12-12 10:27 ` jakub at gcc dot gnu.org 2024-03-07 21:06 ` law at gcc dot gnu.org 2024-03-10 5:55 ` [Bug middle-end/111683] [11/12/13/14 Regression] Incorrect answer when using SSE2 intrinsics with -O3 since r7-3163-g973625a04b3d9351f2485e37f7d3382af2aed87e kugan at gcc dot gnu.org 2024-03-10 11:15 ` sjames at gcc dot gnu.org 2024-03-12 1:58 ` pinskia at gcc dot gnu.org 2024-03-12 2:24 ` pinskia at gcc dot gnu.org 2024-03-12 2:31 ` pinskia at gcc dot gnu.org 2024-03-12 2:44 ` pinskia at gcc dot gnu.org 2024-03-12 13:23 ` jakub at gcc dot gnu.org 2024-03-19 17:28 ` jakub at gcc dot gnu.org 2024-03-19 18:17 ` pinskia at gcc dot gnu.org 2024-03-21 16:47 ` jakub at gcc dot gnu.org 2024-03-22 7:33 ` rguenth at gcc dot gnu.org 2024-03-22 7:38 ` rguenth at gcc dot gnu.org 2024-03-22 7:47 ` jakub at gcc dot gnu.org 2024-03-22 7:50 ` jakub at gcc dot gnu.org 2024-03-22 8:06 ` rguenth at gcc dot gnu.org 2024-03-22 8:18 ` jakub at gcc dot gnu.org 2024-03-22 10:37 ` jakub at gcc dot gnu.org 2024-03-22 10:46 ` jakub at gcc dot gnu.org 2024-03-22 11:35 ` rguenth at gcc dot gnu.org 2024-03-22 11:43 ` jakub at gcc dot gnu.org 2024-03-22 12:42 ` rguenther at suse dot de 2024-03-23 10:18 ` cvs-commit at gcc dot gnu.org 2024-03-23 10:21 ` [Bug middle-end/111683] [11/12/13 " jakub at gcc dot gnu.org 2024-03-30 3:55 ` cvs-commit at gcc dot gnu.org
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