Bug 20111 – asm VCVTPS2PH is not encoded correctly

Compiling and then disassembling this test function shows that DMD does not emit the correct machine code for the VCVTPS2PH instruction. Trying to use this instruction crashes the program. The equivalent program works on LDC and GDC, so this is a back-end problem. __vector(short[8]) vcvtps2ph(__vector(float[4]) value) { asm { naked; vcvtps2ph XMM0, XMM0, 0; // BAD ret; } } I believe that this is the correct encoding (copied from LDC output): __vector(short[8]) vcvtps2ph(__vector(float[4]) value) { asm { naked; db 0xc4, 0xe3, 0x79, 0x1d, 0xc0, 0x00; // OK? ret; } } The related VCVTPH2PS works - perhaps because it lacks the extra rounding control argument? extern(C) __vector(float[4]) vcvtph2ps(__vector(short[8]) bin16s) { asm { naked; vcvtph2ps XMM0, XMM0; ret; } }

@WalterBright created dlang/dmd pull request #12050 "fix Issue 20111 - asm VCVTPS2PH is not encoded correctly" fixing this issue: - fix Issue 20111 - asm VCVTPS2PH is not encoded correctly https://github.com/dlang/dmd/pull/12050

dlang/dmd pull request #12050 "fix Issue 20111 - asm VCVTPS2PH is not encoded correctly" was merged into master: - 0430255064ecf49fef283d70e9b74f35d63ecfe2 by Walter Bright: fix Issue 20111 - asm VCVTPS2PH is not encoded correctly https://github.com/dlang/dmd/pull/12050