diff options
Diffstat (limited to 'llvm/docs/CommandGuide/llvm-exegesis.rst')
| -rw-r--r-- | llvm/docs/CommandGuide/llvm-exegesis.rst | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/llvm/docs/CommandGuide/llvm-exegesis.rst b/llvm/docs/CommandGuide/llvm-exegesis.rst index f48ef60707d..e9a4b9d87c4 100644 --- a/llvm/docs/CommandGuide/llvm-exegesis.rst +++ b/llvm/docs/CommandGuide/llvm-exegesis.rst @@ -93,14 +93,15 @@ Real-life code snippets typically depend on registers or memory. :program:`llvm-exegesis` checks the liveliness of registers (i.e. any register use has a corresponding def or is a "live in"). If your code depends on the value of some registers, you have two options: - - Mark the register as requiring a definition. :program:`llvm-exegesis` will - automatically assign a value to the register. This can be done using the - directive `LLVM-EXEGESIS-DEFREG <reg name> <hex_value>`, where `<hex_value>` - is a bit pattern used to fill `<reg_name>`. If `<hex_value>` is smaller than - the register width, it will be sign-extended. - - Mark the register as a "live in". :program:`llvm-exegesis` will benchmark - using whatever value was in this registers on entry. This can be done using - the directive `LLVM-EXEGESIS-LIVEIN <reg name>`. + +- Mark the register as requiring a definition. :program:`llvm-exegesis` will + automatically assign a value to the register. This can be done using the + directive `LLVM-EXEGESIS-DEFREG <reg name> <hex_value>`, where `<hex_value>` + is a bit pattern used to fill `<reg_name>`. If `<hex_value>` is smaller than + the register width, it will be sign-extended. +- Mark the register as a "live in". :program:`llvm-exegesis` will benchmark + using whatever value was in this registers on entry. This can be done using + the directive `LLVM-EXEGESIS-LIVEIN <reg name>`. For example, the following code snippet depends on the values of XMM1 (which will be set by the tool) and the memory buffer passed in RDI (live in). |
