Instruction
VCVTSI2SS
Converts a signed 32- or 64-bit integer to single in the low element; the other elements come from the first source.
- Extensions
- Forms
- 8 (4 VEX, 4 EVEX)
- Data
- Intel XED v2026.08.23
Forms
| Instruction | Encoding | Requires |
|---|---|---|
VCVTSI2SS xmm, xmm, m32
VCVTSI2SS_XMMdq_XMMdq_MEMd | VEX.LIG.F3.0F.W0 2A /r | AVX |
VCVTSI2SS xmm, xmm, r32
VCVTSI2SS_XMMdq_XMMdq_GPR32d | VEX.LIG.F3.0F.W0 2A /r | AVX |
VCVTSI2SS xmm, xmm, m64 64-bit mode only
VCVTSI2SS_XMMdq_XMMdq_MEMq | VEX.LIG.F3.0F.W1 2A /r | AVX |
VCVTSI2SS xmm, xmm, r64 64-bit mode only
VCVTSI2SS_XMMdq_XMMdq_GPR64q | VEX.LIG.F3.0F.W1 2A /r | AVX |
VCVTSI2SS xmm, xmm, r32, {er}
VCVTSI2SS_XMMf32_XMMf32_GPR32i32_AVX512 | EVEX.LIG.F3.0F.W0 2A /r | AVX10.1 or AVX512F |
VCVTSI2SS xmm, xmm, m32
VCVTSI2SS_XMMf32_XMMf32_MEMi32_AVX512 | EVEX.LIG.F3.0F.W0 2A /r | AVX10.1 or AVX512F |
VCVTSI2SS xmm, xmm, r64, {er} 64-bit mode only
VCVTSI2SS_XMMf32_XMMf32_GPR64i64_AVX512 | EVEX.LIG.F3.0F.W1 2A /r | AVX10.1 or AVX512F |
VCVTSI2SS xmm, xmm, m64 64-bit mode only
VCVTSI2SS_XMMf32_XMMf32_MEMi64_AVX512 | EVEX.LIG.F3.0F.W1 2A /r | AVX10.1 or AVX512F |
Intrinsics
The C intrinsics of Clang 23.1.2 that compile to VCVTSI2SS, each with the form it compiles to and the Clang options it needs. The forms come from compiling every intrinsic and decoding the result with Intel XED; all intrinsics A–Z explains the method.
| Intrinsic | Compiles to |
|---|---|
_mm_cvt_roundi32_ss
__m128 _mm_cvt_roundi32_ss(__m128 A, int B, const int R) |
|
_mm_cvt_roundi64_ss
__m128 _mm_cvt_roundi64_ss(__m128 A, long long B, const int R) |
|
_mm_cvt_roundsi32_ss
__m128 _mm_cvt_roundsi32_ss(__m128 A, int B, const int R) |
|
_mm_cvt_roundsi64_ss
__m128 _mm_cvt_roundsi64_ss(__m128 A, long long B, const int R) |
|
_mm_cvt_si2ss
__m128 _mm_cvt_si2ss(__m128 __a, int __b) |
|
_mm_cvtsi32_ss
__m128 _mm_cvtsi32_ss(__m128 __a, int __b) |
|
_mm_cvtsi64_ss
__m128 _mm_cvtsi64_ss(__m128 __a, long long __b) |
|
CPUID and processors
Each form belongs to an XED ISA set. A form can be used when the processor reports every CPUID bit of one of its ISA set's alternatives.
| ISA set | CPUID | Processors in XED |
|---|---|---|
AVX | AVX | Sandy Bridge, Ivy Bridge, Haswell, Broadwell, Skylake, Comet Lake, Cannon Lake, Ice Lake (client), Tiger Lake, Alder Lake, Arrow Lake, Panther Lake, Nova Lake, Skylake-SP, Cascade Lake, Cooper Lake, Ice Lake (server), Sapphire Rapids, Emerald Rapids, Granite Rapids, Diamond Rapids, Sierra Forest, Clearwater Forest, Knights Landing, Knights Mill, Bulldozer, Piledriver, Zen, Zen+, Zen 2 |
AVX512F_SCALAR | AVX10.1 or AVX512F | Cannon Lake, Ice Lake (client), Tiger Lake, Nova Lake, Skylake-SP, Cascade Lake, Cooper Lake, Ice Lake (server), Sapphire Rapids, Emerald Rapids, Granite Rapids, Diamond Rapids, Knights Landing, Knights Mill |
More AVX10.1 instructions
- VCVTPS2DQ
- VCVTPS2PD
- VCVTPS2PH
- VCVTPS2PHX
- VCVTPS2QQ
- VCVTPS2UDQ
- VCVTPS2UQQ
- VCVTQQ2PD
- VCVTQQ2PH
- VCVTQQ2PS
- VCVTSD2SH
- VCVTSD2SI
- VCVTSD2SS
- VCVTSD2USI
- VCVTSH2SD
- VCVTSH2SI
- VCVTSH2SS
- VCVTSH2USI
- VCVTSI2SD
- VCVTSI2SH
- VCVTSS2SD
- VCVTSS2SH
- VCVTSS2SI
- VCVTSS2USI
- VCVTTPD2DQ
- VCVTTPD2QQ
- VCVTTPD2UDQ
- VCVTTPD2UQQ
- VCVTTPH2DQ
- VCVTTPH2QQ
- VCVTTPH2UDQ
- VCVTTPH2UQQ
- VCVTTPH2UW
- VCVTTPH2W
- VCVTTPS2DQ
- VCVTTPS2QQ
- VCVTTPS2UDQ
- VCVTTPS2UQQ
- VCVTTSD2SI
- VCVTTSD2USI
Sources
- Intel XED v2026.08.23 (commit
0bcb6237345c): forms, encodings, ISA sets, CPUID bits and chip model. - Clang's x86 intrinsic headers, LLVM 23.1.2 (commit
85ac56026243): the intrinsics, their signatures and doc comments, and the Clang of that release, which compiled each of them. - Intel Advanced Vector Extensions 10.2 Architecture Specification, revision 6.0 (361050-006, January 2026)
The tables are derived from Intel XED, Copyright Intel Corporation, licensed under the Apache License 2.0; x86-64.net converted and reformatted them. The intrinsics and their signatures come from Clang, part of the LLVM Project, licensed under the Apache License 2.0 with LLVM Exceptions. The text is our own.