https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79299
Bug ID: 79299 Summary: [7 Regression] Operand size mismatch for `vpgatherqd' w/ -O3 -masm=intel -mavx512bw Product: gcc Version: 7.0 Status: UNCONFIRMED Keywords: assemble-failure Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: asolokha at gmx dot com Target Milestone: --- Target: x86_64-pc-linux-gnu When compiling the following snippet w/ -O3 -masm=intel -mavx512bw (and other flavors of AVX-512) using gcc-7.0.0-alpha20170129 snapshot, gas 2.27 emits the "operand size mismatch" error for instruction vpgatherqd: int q9 (int b7, int dr) { int **ov; int rk = &b7; while (dr != 0) { while (b7 != 0) ++b7; rk += **ov; ++dr; } return rk; } % x86_64-pc-linux-gnu-gcc-7.0.0-alpha20170129 -O3 -masm=intel -mavx512bw -c -w xivubswo.c /tmp/cc27Zzec.s: Assembler messages: /tmp/cc27Zzec.s:38: Error: operand size mismatch for `vpgatherqd' /tmp/cc27Zzec.s:39: Error: operand size mismatch for `vpgatherqd'