[llvm] 992da89 - [llvm-exegesis] Update doc.

[Clement Courbet via llvm-commits]

Author: Clement Courbet
Date: 2020-10-28T08:42:38+01:00
New Revision: 992da89450d6080db3a23ca3e3df09f1ebecb0af

URL: https://github.com/llvm/llvm-project/commit/992da89450d6080db3a23ca3e3df09f1ebecb0af
DIFF: https://github.com/llvm/llvm-project/commit/992da89450d6080db3a23ca3e3df09f1ebecb0af.diff

LOG: [llvm-exegesis] Update doc.

We don't need an external script to scan all opcodes anymore, just use
`-opcode-index=-1`.

Added: 
    

Modified: 
    llvm/docs/CommandGuide/llvm-exegesis.rst

Removed: 
    


################################################################################
diff  --git a/llvm/docs/CommandGuide/llvm-exegesis.rst b/llvm/docs/CommandGuide/llvm-exegesis.rst
index c5756f652bee..5a4ac7f40fca 100644
--- a/llvm/docs/CommandGuide/llvm-exegesis.rst
+++ b/llvm/docs/CommandGuide/llvm-exegesis.rst
@@ -73,12 +73,7 @@ To measure the latency of all instructions for the host architecture, run:
 
 .. code-block:: bash
 
-  #!/bin/bash
-  readonly INSTRUCTIONS=$(($(grep INSTRUCTION_LIST_END build/lib/Target/X86/X86GenInstrInfo.inc | cut -f2 -d=) - 1))
-  for INSTRUCTION in $(seq 1 ${INSTRUCTIONS});
-  do
-    ./build/bin/llvm-exegesis -mode=latency -opcode-index=${INSTRUCTION} | sed -n '/---/,$p'
-  done
+    $ llvm-exegesis -mode=latency -opcode-index=-1
 
 FIXME: Provide an :program:`llvm-exegesis` option to test all instructions.