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Don't use nopl in cpus that don't support it.
Patch by Mikulas Patocka. I added the test. I checked that for cpu names that gas knows about, it also doesn't generate nopl. The modified cpus: i686 - there are i686-class CPUs that don't have nopl: Via c3, Transmeta Crusoe, Microsoft VirtualBox - see https://bbs.archlinux.org/viewtopic.php?pid=775414 k6, k6-2, k6-3, winchip-c6, winchip2 - these are 586-class CPUs via c3 c3-2 - see https://bugs.archlinux.org/task/19733 as a proof that Via c3 and c3-Nehemiah don't have nopl git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195679 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -309,8 +309,12 @@ bool X86AsmBackend::writeNopData(uint64_t Count, MCObjectWriter *OW) const {
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// This CPU doesnt support long nops. If needed add more.
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// FIXME: Can we get this from the subtarget somehow?
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// FIXME: We could generated something better than plain 0x90.
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if (CPU == "generic" || CPU == "i386" || CPU == "i486" || CPU == "i586" ||
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CPU == "pentium" || CPU == "pentium-mmx" || CPU == "geode") {
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CPU == "pentium" || CPU == "pentium-mmx" || CPU == "i686" ||
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CPU == "k6" || CPU == "k6-2" || CPU == "k6-3" || CPU == "geode" ||
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CPU == "winchip-c6" || CPU == "winchip2" || CPU == "c3" ||
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CPU == "c3-2") {
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for (uint64_t i = 0; i < Count; ++i)
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OW->Write8(0x90);
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return true;
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@ -5,9 +5,32 @@
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=pentium %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=pentium-mmx %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=geode %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=i686 %s | llvm-objdump -d - | not FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=i686 %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=k6 %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=k6-2 %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=k6-3 %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=winchip-c6 %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=winchip2 %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=c3 %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=c3-2 %s | llvm-objdump -d - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -arch=x86 -mcpu=core2 %s | llvm-objdump -d - | FileCheck --check-prefix=NOPL %s
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# CHECK-NOT: nop{{[lw]}}
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inc %eax
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.align 8
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inc %eax
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// CHECK: 0: 40 incl %eax
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// CHECK: 1: 90 nop
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// CHECK: 2: 90 nop
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// CHECK: 3: 90 nop
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// CHECK: 4: 90 nop
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// CHECK: 5: 90 nop
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// CHECK: 6: 90 nop
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// CHECK: 7: 90 nop
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// CHECK: 8: 40 incl %eax
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// NOPL: 0: 40 incl %eax
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// NOPL: 1: 0f 1f 80 00 00 00 00 nopl (%eax)
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// NOPL: 8: 40 incl %eax
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