mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-13 20:32:21 +00:00
d6ac8e9a03
latency for certain models of the Intel Atom family, by converting instructions into their equivalent LEA instructions, when it is both useful and possible to do so. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180573 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
1.1 KiB
LLVM
39 lines
1.1 KiB
LLVM
; RUN: llc < %s -mcpu=atom -mtriple=i686-linux | FileCheck %s
|
|
; CHECK: addl
|
|
; CHECK-NEXT:leal
|
|
; CHECK-NEXT:decl
|
|
; CHECK-NEXT:jne
|
|
|
|
; Test for the FixupLEAs pre-emit pass. An LEA should be substituted for the ADD
|
|
; that increments the array pointer because it is within 5 instructions of the
|
|
; corresponding load. The ADD precedes the load by following the loop back edge.
|
|
|
|
; Original C code
|
|
;int test(int n, int * array)
|
|
;{
|
|
; int sum = 0;
|
|
; for(int i = 0; i < n; i++)
|
|
; sum += array[i];
|
|
; return sum;
|
|
;}
|
|
|
|
define i32 @test(i32 %n, i32* nocapture %array) {
|
|
entry:
|
|
%cmp4 = icmp sgt i32 %n, 0
|
|
br i1 %cmp4, label %for.body, label %for.end
|
|
|
|
for.body:
|
|
%i.06 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
|
|
%sum.05 = phi i32 [ %add, %for.body ], [ 0, %entry ]
|
|
%arrayidx = getelementptr inbounds i32* %array, i32 %i.06
|
|
%0 = load i32* %arrayidx, align 4
|
|
%add = add nsw i32 %0, %sum.05
|
|
%inc = add nsw i32 %i.06, 1
|
|
%exitcond = icmp eq i32 %inc, %n
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end:
|
|
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
|
|
ret i32 %sum.0.lcssa
|
|
}
|