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id = 1547
title = "POWER9 emulation is broken when compiler optimizations are on (for gcc 11.3 and later)"
state = "closed"
created_at = "2023-03-16T12:21:17.222Z"
closed_at = "2023-03-23T10:21:14.540Z"
labels = ["linux-user", "target: ppc"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1547"
host-os = "Ubuntu MATE 22.04.2 LTS"
host-arch = "x86_64"
qemu-version = "any prior to 7.x.y (tried 4.2.0, 5.1.0, 6.2.0)"
guest-os = "n/a"
guest-arch = "n/a"
description = """Comparing two floating point memory operands produces incorrect result"""
reproduce = """1. Unpack attached archive and change to test_p64 directory
2. Build the source file with: powerpc64le-linux-gnu-g++ -O2 -static test.cpp -o test_p64
3. Run with QEMU: qemu-ppc64le -cpu POWER9 test_p64 > output.txt
4. Check the output text file output.txt (with pluma or any other text editor) to see the printouts"""
additional = """The pre-built binary and its output file are attached as test_p64.tar.gz[test_p64.tar.gz](/uploads/0e9dbc22e6841496efc15775e6aa624a/test_p64.tar.gz)
The purpose of this report is to motivate the creation of a point release QEMU 6.2.1 for Ubuntu 22.04 LTS (which will be supported for years to come). Also cross-linking similar bug report for MIPS with exact same goal: https://gitlab.com/qemu-project/qemu/-/issues/1531"""
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