MergeConsecutiveStores.ll [plain text]
; RUN: llc -march=x86-64 -mcpu=corei7 < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
%struct.A = type { i8, i8, i8, i8, i8, i8, i8, i8 }
%struct.B = type { i32, i32, i32, i32, i32, i32, i32, i32 }
; Move all of the constants using a single vector store.
; CHECK: merge_const_store
; save 1,2,3 ... as one big integer.
; CHECK: movabsq $578437695752307201
; CHECK: ret
define void @merge_const_store(i32 %count, %struct.A* nocapture %p) nounwind uwtable noinline ssp {
%1 = icmp sgt i32 %count, 0
br i1 %1, label %.lr.ph, label %._crit_edge
.lr.ph:
%i.02 = phi i32 [ %10, %.lr.ph ], [ 0, %0 ]
%.01 = phi %struct.A* [ %11, %.lr.ph ], [ %p, %0 ]
%2 = getelementptr inbounds %struct.A* %.01, i64 0, i32 0
store i8 1, i8* %2, align 1
%3 = getelementptr inbounds %struct.A* %.01, i64 0, i32 1
store i8 2, i8* %3, align 1
%4 = getelementptr inbounds %struct.A* %.01, i64 0, i32 2
store i8 3, i8* %4, align 1
%5 = getelementptr inbounds %struct.A* %.01, i64 0, i32 3
store i8 4, i8* %5, align 1
%6 = getelementptr inbounds %struct.A* %.01, i64 0, i32 4
store i8 5, i8* %6, align 1
%7 = getelementptr inbounds %struct.A* %.01, i64 0, i32 5
store i8 6, i8* %7, align 1
%8 = getelementptr inbounds %struct.A* %.01, i64 0, i32 6
store i8 7, i8* %8, align 1
%9 = getelementptr inbounds %struct.A* %.01, i64 0, i32 7
store i8 8, i8* %9, align 1
%10 = add nsw i32 %i.02, 1
%11 = getelementptr inbounds %struct.A* %.01, i64 1
%exitcond = icmp eq i32 %10, %count
br i1 %exitcond, label %._crit_edge, label %.lr.ph
._crit_edge:
ret void
}
; Move the first 4 constants as a single vector. Move the rest as scalars.
; CHECK: merge_nonconst_store
; CHECK: movl $67305985
; CHECK: movb
; CHECK: movb
; CHECK: movb
; CHECK: movb
; CHECK: ret
define void @merge_nonconst_store(i32 %count, i8 %zz, %struct.A* nocapture %p) nounwind uwtable noinline ssp {
%1 = icmp sgt i32 %count, 0
br i1 %1, label %.lr.ph, label %._crit_edge
.lr.ph:
%i.02 = phi i32 [ %10, %.lr.ph ], [ 0, %0 ]
%.01 = phi %struct.A* [ %11, %.lr.ph ], [ %p, %0 ]
%2 = getelementptr inbounds %struct.A* %.01, i64 0, i32 0
store i8 1, i8* %2, align 1
%3 = getelementptr inbounds %struct.A* %.01, i64 0, i32 1
store i8 2, i8* %3, align 1
%4 = getelementptr inbounds %struct.A* %.01, i64 0, i32 2
store i8 3, i8* %4, align 1
%5 = getelementptr inbounds %struct.A* %.01, i64 0, i32 3
store i8 4, i8* %5, align 1
%6 = getelementptr inbounds %struct.A* %.01, i64 0, i32 4
store i8 %zz, i8* %6, align 1 ; <----------- Not a const;
%7 = getelementptr inbounds %struct.A* %.01, i64 0, i32 5
store i8 6, i8* %7, align 1
%8 = getelementptr inbounds %struct.A* %.01, i64 0, i32 6
store i8 7, i8* %8, align 1
%9 = getelementptr inbounds %struct.A* %.01, i64 0, i32 7
store i8 8, i8* %9, align 1
%10 = add nsw i32 %i.02, 1
%11 = getelementptr inbounds %struct.A* %.01, i64 1
%exitcond = icmp eq i32 %10, %count
br i1 %exitcond, label %._crit_edge, label %.lr.ph
._crit_edge:
ret void
}
;CHECK: merge_loads_i16
; load:
;CHECK: movw
; store:
;CHECK: movw
;CHECK: ret
define void @merge_loads_i16(i32 %count, %struct.A* noalias nocapture %q, %struct.A* noalias nocapture %p) nounwind uwtable noinline ssp {
%1 = icmp sgt i32 %count, 0
br i1 %1, label %.lr.ph, label %._crit_edge
.lr.ph: ; preds = %0
%2 = getelementptr inbounds %struct.A* %q, i64 0, i32 0
%3 = getelementptr inbounds %struct.A* %q, i64 0, i32 1
br label %4
; <label>:4 ; preds = %4, %.lr.ph
%i.02 = phi i32 [ 0, %.lr.ph ], [ %9, %4 ]
%.01 = phi %struct.A* [ %p, %.lr.ph ], [ %10, %4 ]
%5 = load i8* %2, align 1
%6 = load i8* %3, align 1
%7 = getelementptr inbounds %struct.A* %.01, i64 0, i32 0
store i8 %5, i8* %7, align 1
%8 = getelementptr inbounds %struct.A* %.01, i64 0, i32 1
store i8 %6, i8* %8, align 1
%9 = add nsw i32 %i.02, 1
%10 = getelementptr inbounds %struct.A* %.01, i64 1
%exitcond = icmp eq i32 %9, %count
br i1 %exitcond, label %._crit_edge, label %4
._crit_edge: ; preds = %4, %0
ret void
}
; The loads and the stores are interleved. Can't merge them.
;CHECK: no_merge_loads
;CHECK: movb
;CHECK: movb
;CHECK: movb
;CHECK: movb
;CHECK: ret
define void @no_merge_loads(i32 %count, %struct.A* noalias nocapture %q, %struct.A* noalias nocapture %p) nounwind uwtable noinline ssp {
%1 = icmp sgt i32 %count, 0
br i1 %1, label %.lr.ph, label %._crit_edge
.lr.ph: ; preds = %0
%2 = getelementptr inbounds %struct.A* %q, i64 0, i32 0
%3 = getelementptr inbounds %struct.A* %q, i64 0, i32 1
br label %a4
a4: ; preds = %4, %.lr.ph
%i.02 = phi i32 [ 0, %.lr.ph ], [ %a9, %a4 ]
%.01 = phi %struct.A* [ %p, %.lr.ph ], [ %a10, %a4 ]
%a5 = load i8* %2, align 1
%a7 = getelementptr inbounds %struct.A* %.01, i64 0, i32 0
store i8 %a5, i8* %a7, align 1
%a8 = getelementptr inbounds %struct.A* %.01, i64 0, i32 1
%a6 = load i8* %3, align 1
store i8 %a6, i8* %a8, align 1
%a9 = add nsw i32 %i.02, 1
%a10 = getelementptr inbounds %struct.A* %.01, i64 1
%exitcond = icmp eq i32 %a9, %count
br i1 %exitcond, label %._crit_edge, label %a4
._crit_edge: ; preds = %4, %0
ret void
}
;CHECK: merge_loads_integer
; load:
;CHECK: movq
; store:
;CHECK: movq
;CHECK: ret
define void @merge_loads_integer(i32 %count, %struct.B* noalias nocapture %q, %struct.B* noalias nocapture %p) nounwind uwtable noinline ssp {
%1 = icmp sgt i32 %count, 0
br i1 %1, label %.lr.ph, label %._crit_edge
.lr.ph: ; preds = %0
%2 = getelementptr inbounds %struct.B* %q, i64 0, i32 0
%3 = getelementptr inbounds %struct.B* %q, i64 0, i32 1
br label %4
; <label>:4 ; preds = %4, %.lr.ph
%i.02 = phi i32 [ 0, %.lr.ph ], [ %9, %4 ]
%.01 = phi %struct.B* [ %p, %.lr.ph ], [ %10, %4 ]
%5 = load i32* %2
%6 = load i32* %3
%7 = getelementptr inbounds %struct.B* %.01, i64 0, i32 0
store i32 %5, i32* %7
%8 = getelementptr inbounds %struct.B* %.01, i64 0, i32 1
store i32 %6, i32* %8
%9 = add nsw i32 %i.02, 1
%10 = getelementptr inbounds %struct.B* %.01, i64 1
%exitcond = icmp eq i32 %9, %count
br i1 %exitcond, label %._crit_edge, label %4
._crit_edge: ; preds = %4, %0
ret void
}
;CHECK: merge_loads_vector
; load:
;CHECK: movups
; store:
;CHECK: movups
;CHECK: ret
define void @merge_loads_vector(i32 %count, %struct.B* noalias nocapture %q, %struct.B* noalias nocapture %p) nounwind uwtable noinline ssp {
%a1 = icmp sgt i32 %count, 0
br i1 %a1, label %.lr.ph, label %._crit_edge
.lr.ph: ; preds = %0
%a2 = getelementptr inbounds %struct.B* %q, i64 0, i32 0
%a3 = getelementptr inbounds %struct.B* %q, i64 0, i32 1
%a4 = getelementptr inbounds %struct.B* %q, i64 0, i32 2
%a5 = getelementptr inbounds %struct.B* %q, i64 0, i32 3
br label %block4
block4: ; preds = %4, %.lr.ph
%i.02 = phi i32 [ 0, %.lr.ph ], [ %c9, %block4 ]
%.01 = phi %struct.B* [ %p, %.lr.ph ], [ %c10, %block4 ]
%a7 = getelementptr inbounds %struct.B* %.01, i64 0, i32 0
%a8 = getelementptr inbounds %struct.B* %.01, i64 0, i32 1
%a9 = getelementptr inbounds %struct.B* %.01, i64 0, i32 2
%a10 = getelementptr inbounds %struct.B* %.01, i64 0, i32 3
%b1 = load i32* %a2
%b2 = load i32* %a3
%b3 = load i32* %a4
%b4 = load i32* %a5
store i32 %b1, i32* %a7
store i32 %b2, i32* %a8
store i32 %b3, i32* %a9
store i32 %b4, i32* %a10
%c9 = add nsw i32 %i.02, 1
%c10 = getelementptr inbounds %struct.B* %.01, i64 1
%exitcond = icmp eq i32 %c9, %count
br i1 %exitcond, label %._crit_edge, label %block4
._crit_edge: ; preds = %4, %0
ret void
}
;CHECK: merge_loads_no_align
; load:
;CHECK: movl
;CHECK: movl
;CHECK: movl
;CHECK: movl
; store:
;CHECK: movl
;CHECK: movl
;CHECK: movl
;CHECK: movl
;CHECK: ret
define void @merge_loads_no_align(i32 %count, %struct.B* noalias nocapture %q, %struct.B* noalias nocapture %p) nounwind uwtable noinline ssp {
%a1 = icmp sgt i32 %count, 0
br i1 %a1, label %.lr.ph, label %._crit_edge
.lr.ph: ; preds = %0
%a2 = getelementptr inbounds %struct.B* %q, i64 0, i32 0
%a3 = getelementptr inbounds %struct.B* %q, i64 0, i32 1
%a4 = getelementptr inbounds %struct.B* %q, i64 0, i32 2
%a5 = getelementptr inbounds %struct.B* %q, i64 0, i32 3
br label %block4
block4: ; preds = %4, %.lr.ph
%i.02 = phi i32 [ 0, %.lr.ph ], [ %c9, %block4 ]
%.01 = phi %struct.B* [ %p, %.lr.ph ], [ %c10, %block4 ]
%a7 = getelementptr inbounds %struct.B* %.01, i64 0, i32 0
%a8 = getelementptr inbounds %struct.B* %.01, i64 0, i32 1
%a9 = getelementptr inbounds %struct.B* %.01, i64 0, i32 2
%a10 = getelementptr inbounds %struct.B* %.01, i64 0, i32 3
%b1 = load i32* %a2, align 1
%b2 = load i32* %a3, align 1
%b3 = load i32* %a4, align 1
%b4 = load i32* %a5, align 1
store i32 %b1, i32* %a7, align 1
store i32 %b2, i32* %a8, align 1
store i32 %b3, i32* %a9, align 1
store i32 %b4, i32* %a10, align 1
%c9 = add nsw i32 %i.02, 1
%c10 = getelementptr inbounds %struct.B* %.01, i64 1
%exitcond = icmp eq i32 %c9, %count
br i1 %exitcond, label %._crit_edge, label %block4
._crit_edge: ; preds = %4, %0
ret void
}