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llvm-mirror/test/Transforms/SROA/alignment.ll
Eli Friedman 3a9c279a90 AllocaInst should store Align instead of MaybeAlign. 
Along the lines of D77454 and D79968.  Unlike loads and stores, the
default alignment is getPrefTypeAlign, to match the existing handling in
various places, including SelectionDAG and InstCombine.

Differential Revision: https://reviews.llvm.org/D80044
2020-05-16 14:53:16 -07:00

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8.6 KiB
LLVM
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; RUN: opt < %s -sroa -S | FileCheck %s
; RUN: opt -debugify -sroa -S < %s | FileCheck %s -check-prefix DEBUGLOC
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i1)
define void @test1({ i8, i8 }* %a, { i8, i8 }* %b) {
; CHECK-LABEL: @test1(
; CHECK: %[[gep_a0:.*]] = getelementptr inbounds { i8, i8 }, { i8, i8 }* %a, i64 0, i32 0
; CHECK: %[[a0:.*]] = load i8, i8* %[[gep_a0]], align 16
; CHECK: %[[gep_a1:.*]] = getelementptr inbounds { i8, i8 }, { i8, i8 }* %a, i64 0, i32 1
; CHECK: %[[a1:.*]] = load i8, i8* %[[gep_a1]], align 1
; CHECK: %[[gep_b0:.*]] = getelementptr inbounds { i8, i8 }, { i8, i8 }* %b, i64 0, i32 0
; CHECK: store i8 %[[a0]], i8* %[[gep_b0]], align 16
; CHECK: %[[gep_b1:.*]] = getelementptr inbounds { i8, i8 }, { i8, i8 }* %b, i64 0, i32 1
; CHECK: store i8 %[[a1]], i8* %[[gep_b1]], align 1
; CHECK: ret void
entry:
%alloca = alloca { i8, i8 }, align 16
%gep_a = getelementptr { i8, i8 }, { i8, i8 }* %a, i32 0, i32 0
%gep_alloca = getelementptr { i8, i8 }, { i8, i8 }* %alloca, i32 0, i32 0
%gep_b = getelementptr { i8, i8 }, { i8, i8 }* %b, i32 0, i32 0
store i8 420, i8* %gep_alloca, align 16
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 %gep_alloca, i8* align 16 %gep_a, i32 2, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 %gep_b, i8* align 16 %gep_alloca, i32 2, i1 false)
ret void
}
define void @test2() {
; CHECK-LABEL: @test2(
; CHECK: alloca i16
; CHECK: load i8, i8* %{{.*}}
; CHECK: store i8 42, i8* %{{.*}}
; CHECK: ret void
; Check that when sroa rewrites the alloca partition
; it preserves the original DebugLocation.
; DEBUGLOC-LABEL: @test2(
; DEBUGLOC: {{.*}} = alloca {{.*}} !dbg ![[DbgLoc:[0-9]+]]
; DEBUGLOC-LABEL: }
;
; DEBUGLOC: ![[DbgLoc]] = !DILocation(line: 9,
entry:
%a = alloca { i8, i8, i8, i8 }, align 2 ; "line 9" to -debugify
%gep1 = getelementptr { i8, i8, i8, i8 }, { i8, i8, i8, i8 }* %a, i32 0, i32 1
%cast1 = bitcast i8* %gep1 to i16*
store volatile i16 0, i16* %cast1
%gep2 = getelementptr { i8, i8, i8, i8 }, { i8, i8, i8, i8 }* %a, i32 0, i32 2
%result = load i8, i8* %gep2
store i8 42, i8* %gep2
ret void
}
define void @PR13920(<2 x i64>* %a, i16* %b) {
; Test that alignments on memcpy intrinsics get propagated to loads and stores.
; CHECK-LABEL: @PR13920(
; CHECK: load <2 x i64>, <2 x i64>* %a, align 2
; CHECK: store <2 x i64> {{.*}}, <2 x i64>* {{.*}}, align 2
; CHECK: ret void
entry:
%aa = alloca <2 x i64>, align 16
%aptr = bitcast <2 x i64>* %a to i8*
%aaptr = bitcast <2 x i64>* %aa to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 2 %aaptr, i8* align 2 %aptr, i32 16, i1 false)
%bptr = bitcast i16* %b to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 2 %bptr, i8* align 2 %aaptr, i32 16, i1 false)
ret void
}
define void @test3(i8* %x) {
; Test that when we promote an alloca to a type with lower ABI alignment, we
; provide the needed explicit alignment that code using the alloca may be
; expecting. However, also check that any offset within an alloca can in turn
; reduce the alignment.
; CHECK-LABEL: @test3(
; CHECK: alloca [22 x i8], align 8
; CHECK: alloca [18 x i8], align 2
; CHECK: ret void
entry:
%a = alloca { i8*, i8*, i8* }
%b = alloca { i8*, i8*, i8* }
%a_raw = bitcast { i8*, i8*, i8* }* %a to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 8 %a_raw, i8* align 8 %x, i32 22, i1 false)
%b_raw = bitcast { i8*, i8*, i8* }* %b to i8*
%b_gep = getelementptr i8, i8* %b_raw, i32 6
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 2 %b_gep, i8* align 2 %x, i32 18, i1 false)
ret void
}
define void @test5() {
; Test that we preserve underaligned loads and stores when splitting. The use
; of volatile in this test case is just to force the loads and stores to not be
; split or promoted out of existence.
;
; CHECK-LABEL: @test5(
; CHECK: alloca [9 x i8]
; CHECK: alloca [9 x i8]
; CHECK: store volatile double 0.0{{.*}}, double* %{{.*}}, align 1
; CHECK: load volatile i16, i16* %{{.*}}, align 1
; CHECK: load double, double* %{{.*}}, align 1
; CHECK: store volatile double %{{.*}}, double* %{{.*}}, align 1
; CHECK: load volatile i16, i16* %{{.*}}, align 1
; CHECK: ret void
entry:
%a = alloca [18 x i8]
%raw1 = getelementptr inbounds [18 x i8], [18 x i8]* %a, i32 0, i32 0
%ptr1 = bitcast i8* %raw1 to double*
store volatile double 0.0, double* %ptr1, align 1
%weird_gep1 = getelementptr inbounds [18 x i8], [18 x i8]* %a, i32 0, i32 7
%weird_cast1 = bitcast i8* %weird_gep1 to i16*
%weird_load1 = load volatile i16, i16* %weird_cast1, align 1
%raw2 = getelementptr inbounds [18 x i8], [18 x i8]* %a, i32 0, i32 9
%ptr2 = bitcast i8* %raw2 to double*
%d1 = load double, double* %ptr1, align 1
store volatile double %d1, double* %ptr2, align 1
%weird_gep2 = getelementptr inbounds [18 x i8], [18 x i8]* %a, i32 0, i32 16
%weird_cast2 = bitcast i8* %weird_gep2 to i16*
%weird_load2 = load volatile i16, i16* %weird_cast2, align 1
ret void
}
define void @test6() {
; We should set the alignment on all load and store operations; make sure
; we choose an appropriate alignment.
; CHECK-LABEL: @test6(
; CHECK: alloca double, align 8{{$}}
; CHECK: alloca double, align 8{{$}}
; CHECK: store{{.*}}, align 8
; CHECK: load{{.*}}, align 8
; CHECK: store{{.*}}, align 8
; CHECK-NOT: align
; CHECK: ret void
entry:
%a = alloca [16 x i8]
%raw1 = getelementptr inbounds [16 x i8], [16 x i8]* %a, i32 0, i32 0
%ptr1 = bitcast i8* %raw1 to double*
store volatile double 0.0, double* %ptr1, align 1
%raw2 = getelementptr inbounds [16 x i8], [16 x i8]* %a, i32 0, i32 8
%ptr2 = bitcast i8* %raw2 to double*
%val = load double, double* %ptr1, align 1
store volatile double %val, double* %ptr2, align 1
ret void
}
define void @test7(i8* %out) {
; Test that we properly compute the destination alignment when rewriting
; memcpys as direct loads or stores.
; CHECK-LABEL: @test7(
; CHECK-NOT: alloca
entry:
%a = alloca [16 x i8]
%raw1 = getelementptr inbounds [16 x i8], [16 x i8]* %a, i32 0, i32 0
%ptr1 = bitcast i8* %raw1 to double*
%raw2 = getelementptr inbounds [16 x i8], [16 x i8]* %a, i32 0, i32 8
%ptr2 = bitcast i8* %raw2 to double*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %raw1, i8* %out, i32 16, i1 false)
; CHECK: %[[val2:.*]] = load double, double* %{{.*}}, align 1
; CHECK: %[[val1:.*]] = load double, double* %{{.*}}, align 1
%val1 = load double, double* %ptr2, align 1
%val2 = load double, double* %ptr1, align 1
store double %val1, double* %ptr1, align 1
store double %val2, double* %ptr2, align 1
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %out, i8* %raw1, i32 16, i1 false)
; CHECK: store double %[[val1]], double* %{{.*}}, align 1
; CHECK: store double %[[val2]], double* %{{.*}}, align 1
ret void
; CHECK: ret void
}
define void @test8() {
; CHECK-LABEL: @test8(
; CHECK: load i32, {{.*}}, align 1
; CHECK: load i32, {{.*}}, align 1
; CHECK: load i32, {{.*}}, align 1
; CHECK: load i32, {{.*}}, align 1
; CHECK: load i32, {{.*}}, align 1
%ptr = alloca [5 x i32], align 1
%ptr.8 = bitcast [5 x i32]* %ptr to i8*
call void @populate(i8* %ptr.8)
%val = load [5 x i32], [5 x i32]* %ptr, align 1
ret void
}
define void @test9() {
; CHECK-LABEL: @test9(
; CHECK: load i32, {{.*}}, align 8
; CHECK: load i32, {{.*}}, align 4
; CHECK: load i32, {{.*}}, align 8
; CHECK: load i32, {{.*}}, align 4
; CHECK: load i32, {{.*}}, align 8
%ptr = alloca [5 x i32], align 8
%ptr.8 = bitcast [5 x i32]* %ptr to i8*
call void @populate(i8* %ptr.8)
%val = load [5 x i32], [5 x i32]* %ptr, align 8
ret void
}
define void @test10() {
; CHECK-LABEL: @test10(
; CHECK: load i32, {{.*}}, align 2
; CHECK: load i8, {{.*}}, align 2
; CHECK: load i8, {{.*}}, align 1
; CHECK: load i8, {{.*}}, align 2
; CHECK: load i16, {{.*}}, align 2
%ptr = alloca {i32, i8, i8, {i8, i16}}, align 2
%ptr.8 = bitcast {i32, i8, i8, {i8, i16}}* %ptr to i8*
call void @populate(i8* %ptr.8)
%val = load {i32, i8, i8, {i8, i16}}, {i32, i8, i8, {i8, i16}}* %ptr, align 2
ret void
}
%struct = type { i32, i32 }
define dso_local i32 @pr45010(%struct* %A) {
; CHECK-LABEL: @pr45010
; CHECK: load atomic volatile i32, {{.*}}, align 4
%B = alloca %struct, align 4
%A.i = getelementptr inbounds %struct, %struct* %A, i32 0, i32 0
%B.i = getelementptr inbounds %struct, %struct* %B, i32 0, i32 0
%1 = load i32, i32* %A.i, align 4
store atomic volatile i32 %1, i32* %B.i release, align 4
%2 = bitcast %struct* %B to i32*
%x = load atomic volatile i32, i32* %2 acquire, align 4
ret i32 %x
}
declare void @populate(i8*)
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