mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-22 09:29:31 +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
52 lines
1.7 KiB
LLVM
52 lines
1.7 KiB
LLVM
; RUN: llc < %s -mcpu=atom -mtriple=i686-linux | FileCheck %s
|
|
; CHECK: addl ([[reg:%[a-z]+]])
|
|
; CHECK-NEXT: addl $4, [[reg]]
|
|
|
|
; Test for the FixupLEAs pre-emit pass.
|
|
; An LEA should NOT be substituted for the ADD instruction
|
|
; that increments the array pointer if it is greater than 5 instructions
|
|
; away from the memory reference that uses it.
|
|
|
|
; Original C code: clang -m32 -S -O2
|
|
;int test(int n, int * array, int * m, int * array2)
|
|
;{
|
|
; int i, j = 0;
|
|
; int sum = 0;
|
|
; for (i = 0, j = 0; i < n;) {
|
|
; ++i;
|
|
; *m += array2[j++];
|
|
; sum += array[i];
|
|
; }
|
|
; return sum;
|
|
;}
|
|
|
|
define i32 @test(i32 %n, i32* nocapture %array, i32* nocapture %m, i32* nocapture %array2) #0 {
|
|
entry:
|
|
%cmp7 = icmp sgt i32 %n, 0
|
|
br i1 %cmp7, label %for.body.lr.ph, label %for.end
|
|
|
|
for.body.lr.ph: ; preds = %entry
|
|
%.pre = load i32* %m, align 4
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %for.body, %for.body.lr.ph
|
|
%0 = phi i32 [ %.pre, %for.body.lr.ph ], [ %add, %for.body ]
|
|
%sum.010 = phi i32 [ 0, %for.body.lr.ph ], [ %add3, %for.body ]
|
|
%j.09 = phi i32 [ 0, %for.body.lr.ph ], [ %inc1, %for.body ]
|
|
%inc1 = add nsw i32 %j.09, 1
|
|
%arrayidx = getelementptr inbounds i32* %array2, i32 %j.09
|
|
%1 = load i32* %arrayidx, align 4
|
|
%add = add nsw i32 %0, %1
|
|
store i32 %add, i32* %m, align 4
|
|
%arrayidx2 = getelementptr inbounds i32* %array, i32 %inc1
|
|
%2 = load i32* %arrayidx2, align 4
|
|
%add3 = add nsw i32 %2, %sum.010
|
|
%exitcond = icmp eq i32 %inc1, %n
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.body, %entry
|
|
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add3, %for.body ]
|
|
ret i32 %sum.0.lcssa
|
|
}
|
|
|