https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81743

            Bug ID: 81743
           Summary: int __attribute__ ((target("arch=westmere"))) is
                    compiled incorrectly
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: ubizjak at gmail dot com
  Target Milestone: ---
            Target: x86

For g++.dg/ext/mv16.C, GCC generates:

[hjl@gnu-tools-1 gcc]$
/export/build/gnu/gcc/build-x86_64-linux/gcc/testsuite/g++/../../xg++
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/testsuite/g++/../../
/export/gnu/import/git/sources/gcc/gcc/testsuite/g++.dg/ext/mv16.C
-fno-diagnostics-show-caret -fdiagnostics-color=never -nostdinc++
-I/export/build/gnu/gcc/build-x86_64-linux/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I/export/build/gnu/gcc/build-x86_64-linux/x86_64-pc-linux-gnu/libstdc++-v3/include
-I/export/gnu/import/git/sources/gcc/libstdc++-v3/libsupc++
-I/export/gnu/import/git/sources/gcc/libstdc++-v3/include/backward
-I/export/gnu/import/git/sources/gcc/libstdc++-v3/testsuite/util
-fmessage-length=0 -std=gnu++14 -O2
-L/export/build/gnu/gcc/build-x86_64-linux/x86_64-pc-linux-gnu/./libstdc++-v3/src/.libs
-B/export/build/gnu/gcc/build-x86_64-linux/x86_64-pc-linux-gnu/./libstdc++-v3/src/.libs
-L/export/build/gnu/gcc/build-x86_64-linux/x86_64-pc-linux-gnu/./libstdc++-v3/src/.libs
-B/export/build/gnu/gcc/build-x86_64-linux/x86_64-pc-linux-gnu/./libitm/
-L/export/build/gnu/gcc/build-x86_64-linux/x86_64-pc-linux-gnu/./libitm/.libs
-S

        .type   _Z3foov.resolver, @function
_Z3foov.resolver:
.LFB11:
        .cfi_startproc
        subq    $8, %rsp
        .cfi_def_cfa_offset 16
        call    __cpu_indicator_init
        cmpl    $13, __cpu_model+8(%rip)
        movl    $_Z3foov.arch_haswell, %eax
        jne     .L29
.L19:
        addq    $8, %rsp
        .cfi_remember_state
        .cfi_def_cfa_offset 8
        ret
        .p2align 4,,10
        .p2align 3
.L29:
        .cfi_restore_state
        cmpl    $14, __cpu_model+8(%rip)
        movl    $_Z3foov.arch_broadwell, %eax
        je      .L19
        cmpl    $15, __cpu_model+8(%rip)
        movl    $_Z3foov.arch_skylake, %eax
        je      .L19
        cmpl    $16, __cpu_model+8(%rip)
        movl    $_Z3foov.arch_skylake_avx512, %eax
        je      .L19
        cmpl    $3, __cpu_model+8(%rip)
        movl    $_Z3foov.arch_sandybridge, %eax
        je      .L19
        cmpl    $12, __cpu_model+8(%rip)
        movl    $_Z3foov.arch_ivybridge, %eax
        je      .L19
        cmpl    $3, __cpu_model+4(%rip)
        movl    $_Z3foov.arch_nehalem, %eax
        je      .L19  <<<<<<<<< This is wrong.  Nehalem and Westmere have
the same CPU type.
        cmpl    $2, __cpu_model+8(%rip)
        movl    $_Z3foov, %eax
        movl    $_Z3foov.arch_westmere, %edx
        cmove   %rdx, %rax
        jmp     .L19
        .cfi_endproc
.LFE11:
        .size   _Z3foov.resolver, .-_Z3foov.resolver

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