x86: Replace -mno-sse4.1 with -mno-sse3 in tests
Adjusts test flags in x86 target to use -mno-sse3 instead of -mno-sse4.1 for vector initialization tests.
Several test cases for x86 vector initialization were using the incorrect flag -mno-sse4.1. This commit replaces it with -mno-sse3 to accurately reflect the desired test conditions. The change ensures that tests dependent on SSE3 features do not accidentally pass due to broader SSE4.1 disabling.
In Details
This commit corrects test flags in GCC's i386 target testsuite. Specifically, several C files (gcc.target/i386/sse2-init-v2df-*.c, sse2-init-v2di-*.c) were incorrectly using -mno-sse4.1 to disable SSE instructions. The commit replaces this with -mno-sse3. This is necessary because certain vector initialization patterns, when compiled with SSE3 enabled, generate more efficient code (e.g., using movddup) compared to SSE2-only code. The tests aim to verify vector initialization behavior, and disabling SSE3 with -mno-sse3 ensures that the tests specifically validate behavior without t…
- x86
- A family of instruction set architectures (ISAs) initially developed by Intel based on the Intel 8086 microprocessor. It is the most widely used ISA for desktop and server computers.
- SSE (Streaming SIMD Extensions)
- A set of CPU instructions that allow for Single Instruction, Multiple Data (SIMD) operations, improving performance for multimedia and scientific applications. SSE, SSE2, SSE3, SSE4.1, etc., are successive generations with expanded capabilities.
- Vector initialization
- The process of setting initial values for vector data types. Efficient vector initialization is crucial for performance in SIMD programming.
- -mno-sse3
- A GCC compiler flag that disables the use of SSE3 instructions. This is used in tests to ensure code behaves correctly without specific SSE3 optimizations or features.
- -mno-sse4.1
- A GCC compiler flag that disables the use of SSE4.1 instructions. This commit replaces this flag with -mno-sse3 in specific test files.