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author | Stephen Hines <srhines@google.com> | 2014-04-23 16:57:46 -0700 |
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committer | Stephen Hines <srhines@google.com> | 2014-04-24 15:53:16 -0700 |
commit | 36b56886974eae4f9c5ebc96befd3e7bfe5de338 (patch) | |
tree | e6cfb69fbbd937f450eeb83bfb83b9da3b01275a /docs/CodeGenerator.rst | |
parent | 69a8640022b04415ae9fac62f8ab090601d8f889 (diff) | |
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Update to LLVM 3.5a.
Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
Diffstat (limited to 'docs/CodeGenerator.rst')
-rw-r--r-- | docs/CodeGenerator.rst | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/docs/CodeGenerator.rst b/docs/CodeGenerator.rst index c87a628..d7d98bc 100644 --- a/docs/CodeGenerator.rst +++ b/docs/CodeGenerator.rst @@ -434,12 +434,12 @@ For example, consider this simple LLVM example: .. code-block:: llvm define i32 @test(i32 %X, i32 %Y) { - %Z = udiv i32 %X, %Y + %Z = sdiv i32 %X, %Y ret i32 %Z } -The X86 instruction selector produces this machine code for the ``div`` and -``ret`` (use "``llc X.bc -march=x86 -print-machineinstrs``" to get this): +The X86 instruction selector might produce this machine code for the ``div`` and +``ret``: .. code-block:: llvm @@ -454,8 +454,8 @@ The X86 instruction selector produces this machine code for the ``div`` and %EAX = mov %reg1026 ;; 32-bit return value goes in EAX ret -By the end of code generation, the register allocator has coalesced the -registers and deleted the resultant identity moves producing the following +By the end of code generation, the register allocator would coalesce the +registers and delete the resultant identity moves producing the following code: .. code-block:: llvm @@ -2145,6 +2145,10 @@ The following target-specific calling conventions are known to backend: others via stack. Callee is responsible for stack cleaning. This convention is used by MSVC by default for methods in its ABI (CC ID = 70). +* **X86_CDeclMethod** --- Identical to the standard x86_32 C calling convention, + except that an sret paramter, if present, is placed on the stack after the + second parameter, which must an integer or pointer. (CC ID = 80). + .. _X86 addressing mode: Representing X86 addressing modes in MachineInstrs |