From 8939b0d8a930729cd8d9c06dd4afd08de93260d2 Mon Sep 17 00:00:00 2001 From: David Greene Date: Tue, 16 Feb 2010 20:50:18 +0000 Subject: Add support for emitting non-temporal stores for DAGs marked non-temporal. Fix from r96241 for botched encoding of MOVNTDQ. Add documentation for !nontemporal metadata. Add a simpler movnt testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96386 91177308-0d34-0410-b5e6-96231b3b80d8 --- docs/LangRef.html | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-) (limited to 'docs') diff --git a/docs/LangRef.html b/docs/LangRef.html index b337b6a..7620838 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -4074,8 +4074,9 @@ Instruction
Syntax:
-  <result> = load <ty>* <pointer>[, align <alignment>]
-  <result> = volatile load <ty>* <pointer>[, align <alignment>]
+  <result> = load <ty>* <pointer>[, align <alignment>][, !nontemporal !]
+  <result> = volatile load <ty>* <pointer>[, align <alignment>][, !nontemporal !]
+  ! = !{ i32 1 }
Overview:
@@ -4088,7 +4089,7 @@ Instruction marked as volatile, then the optimizer is not allowed to modify the number or order of execution of this load with other volatile load and store - instructions.

+ instructions.

The optional constant "align" argument specifies the alignment of the operation (that is, the alignment of the memory address). A value of 0 or an @@ -4098,6 +4099,14 @@ Instruction alignment results in an undefined behavior. Underestimating the alignment may produce less efficient code. An alignment of 1 is always safe.

+

The optional !nontemporal metadata must reference a single metatadata + name corresponding to a metadata node with one i32 entry of + value 1. The existance of the !nontemporal metatadata on the + instruction tells the optimizer and code generator that this load is + not expected to be reused in the cache. The code generator may + select special instructions to save cache bandwidth, such as the + MOVNT intruction on x86.

+
Semantics:

The location of memory pointed to is loaded. If the value being loaded is of scalar type then the number of bytes read does not exceed the minimum number @@ -4124,8 +4133,8 @@ Instruction

Syntax:
-  store <ty> <value>, <ty>* <pointer>[, align <alignment>]                   ; yields {void}
-  volatile store <ty> <value>, <ty>* <pointer>[, align <alignment>]          ; yields {void}
+  store <ty> <value>, <ty>* <pointer>[, align <alignment>][, !nontemporal !]                   ; yields {void}
+  volatile store <ty> <value>, <ty>* <pointer>[, align <alignment>][, !nontemporal !]          ; yields {void}
Overview:
@@ -4150,6 +4159,15 @@ Instruction alignment results in an undefined behavior. Underestimating the alignment may produce less efficient code. An alignment of 1 is always safe.

+

The optional !nontemporal metadata must reference a single metatadata + name corresponding to a metadata node with one i32 entry of + value 1. The existance of the !nontemporal metatadata on the + instruction tells the optimizer and code generator that this load is + not expected to be reused in the cache. The code generator may + select special instructions to save cache bandwidth, such as the + MOVNT intruction on x86.

+ +
Semantics:

The contents of memory are updated to contain '<value>' at the location specified by the '<pointer>' operand. If -- cgit v1.1