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llvm-project/llvm/test/MC/X86/x86_long_nop.s

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Fixes a test by replacing .align by .p2align and setting triples explicitly. Patch by David Sehr llvm-svn: 176502
2013-03-06 02:56:14 +08:00
# RUN: llvm-mc -filetype=obj -arch=x86 -triple=x86_64-pc-linux-gnu %s | llvm-objdump -d -no-show-raw-insn - | FileCheck %s
# RUN: llvm-mc -filetype=obj -arch=x86 -triple=i686-pc-linux-gnu %s | llvm-objdump -d -no-show-raw-insn - | FileCheck %s
# RUN: llvm-mc -filetype=obj -arch=x86 -triple=x86_64-apple-darwin10.0 %s | llvm-objdump -d -no-show-raw-insn - | FileCheck %s
# RUN: llvm-mc -filetype=obj -arch=x86 -triple=i686-apple-darwin8 %s | llvm-objdump -d -no-show-raw-insn - | FileCheck %s
[X86] Limit maximum nop length on Silvermont Silvermont can only decode one instruction per cycle if the instruction exceeds 8 bytes. Also in Silvermont instructions with more than 3 prefixes will cause 3 cycle penalty. Maximum nop length is limited to 7 bytes when used for padding on Silvermont. For other x86 processors max nop length remains unchanged 15 bytes. Differential Revision: http://reviews.llvm.org/D4374 llvm-svn: 212321
2014-07-04 15:14:56 +08:00
# RUN: llvm-mc -filetype=obj -arch=x86 -triple=i686-pc-linux-gnu -mcpu=slm %s | llvm-objdump -d -no-show-raw-insn - | FileCheck --check-prefix=SLM %s
Add a test that .align directives on capable processors use long NOPs. llvm-svn: 176490
2013-03-06 00:46:54 +08:00
# Ensure alignment directives also emit sequences of 15-byte NOPs on processors
# capable of using long NOPs.
inc %eax
Fixes a test by replacing .align by .p2align and setting triples explicitly. Patch by David Sehr llvm-svn: 176502
2013-03-06 02:56:14 +08:00
.p2align 5
Add a test that .align directives on capable processors use long NOPs. llvm-svn: 176490
2013-03-06 00:46:54 +08:00
inc %eax
# CHECK: 0: inc
# CHECK-NEXT: 1: nop
# CHECK-NEXT: 10: nop
# CHECK-NEXT: 1f: nop
# CHECK-NEXT: 20: inc
[X86] Limit maximum nop length on Silvermont Silvermont can only decode one instruction per cycle if the instruction exceeds 8 bytes. Also in Silvermont instructions with more than 3 prefixes will cause 3 cycle penalty. Maximum nop length is limited to 7 bytes when used for padding on Silvermont. For other x86 processors max nop length remains unchanged 15 bytes. Differential Revision: http://reviews.llvm.org/D4374 llvm-svn: 212321
2014-07-04 15:14:56 +08:00
# On Silvermont we emit only 7 byte NOPs since longer NOPs are not profitable
# SLM: 0: inc
# SLM-NEXT: 1: nop
# SLM-NEXT: 8: nop
# SLM-NEXT: f: nop
# SLM-NEXT: 16: nop
# SLM-NEXT: 1d: nop
# SLM-NEXT: 20: inc