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Summary: MONITORX/MWAITX instructions provide similar capability to the MONITOR/MWAIT pair while adding a timer function, such that another termination of the MWAITX instruction occurs when the timer expires. The presence of the MONITORX and MWAITX instructions is indicated by CPUID 8000_0001, ECX, bit 29. The MONITORX and MWAITX instructions are intercepted by the same bits that intercept MONITOR and MWAIT. MONITORX instruction establishes a range to be monitored. MWAITX instruction causes the processor to stop instruction execution and enter an implementation-dependent optimized state until occurrence of a class of events. Opcode of MONITORX instruction is "0F 01 FA". Opcode of MWAITX instruction is "0F 01 FB". These opcode information is used in adding tests for the disassembler. These instructions are enabled for AMD's bdver4 architecture. Patch by Ganesh Gopalasubramanian! Reviewers: echristo, craig.topper, RKSimon Subscribers: RKSimon, joker.eph, llvm-commits Differential Revision: http://reviews.llvm.org/D19795 llvm-svn: 269911
39 lines
1.1 KiB
LLVM
39 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-linux -mattr=+mwaitx | FileCheck %s
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; RUN: llc < %s -mtriple=x86_64-win32 -mattr=+mwaitx | FileCheck %s -check-prefix=WIN64
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; RUN: llc < %s -mtriple=x86_64-linux -mcpu=bdver4 | FileCheck %s
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; RUN: llc < %s -mtriple=x86_64-win32 -mcpu=bdver4 | FileCheck %s -check-prefix=WIN64
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; CHECK-LABEL: foo:
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; CHECK: leaq (%rdi), %rax
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; CHECK-NEXT: movl %esi, %ecx
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; CHECK-NEXT: monitorx
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; WIN64-LABEL: foo:
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; WIN64: leaq (%rcx), %rax
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; WIN64-NEXT: movl %edx, %ecx
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; WIN64-NEXT: movl %r8d, %edx
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; WIN64-NEXT: monitorx
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define void @foo(i8* %P, i32 %E, i32 %H) nounwind {
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entry:
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tail call void @llvm.x86.monitorx(i8* %P, i32 %E, i32 %H)
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ret void
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}
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declare void @llvm.x86.monitorx(i8*, i32, i32) nounwind
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; CHECK-LABEL: bar:
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; CHECK: movl %edi, %ecx
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; CHECK-NEXT: movl %esi, %eax
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; CHECK-NEXT: movl %edx, %ebx
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; CHECK-NEXT: mwaitx
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; WIN64-LABEL: bar:
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; WIN64: movl %edx, %eax
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; WIN64: movl %r8d, %ebx
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; WIN64-NEXT: mwaitx
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define void @bar(i32 %E, i32 %H, i32 %C) nounwind {
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entry:
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tail call void @llvm.x86.mwaitx(i32 %E, i32 %H, i32 %C)
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ret void
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}
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declare void @llvm.x86.mwaitx(i32, i32, i32) nounwind
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