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llvm-mirror/test/CodeGen/ARM/ldstrex.ll
Tim Northover 5b3d6373ba ARM: fix Thumb2 CodeGen for ldrex with folded frame-index. 
Because t2LDREX (& t2STREX) were marked as AddrModeNone, but did allow a
FrameIndex operand, rewriteT2FrameIndex asserted. This gives them a
proper addressing-mode and tells the rewriter about it so that encodable
offsets are exploited and others are rejected.

Should fix PR38828.

llvm-svn: 341642
2018-09-07 09:21:25 +00:00

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; RUN: llc < %s -mtriple=armv7-apple-darwin | FileCheck %s
; RUN: llc < %s -mtriple=thumbv7-apple-darwin > %t
; RUN: FileCheck %s < %t
; RUN: FileCheck %s < %t --check-prefix=CHECK-T2ADDRMODE
%0 = type { i32, i32 }
; CHECK-LABEL: f0:
; CHECK: ldrexd
define i64 @f0(i8* %p) nounwind readonly {
entry:
%ldrexd = tail call %0 @llvm.arm.ldrexd(i8* %p)
%0 = extractvalue %0 %ldrexd, 1
%1 = extractvalue %0 %ldrexd, 0
%2 = zext i32 %0 to i64
%3 = zext i32 %1 to i64
%shl = shl nuw i64 %2, 32
%4 = or i64 %shl, %3
ret i64 %4
}
; CHECK-LABEL: f1:
; CHECK: strexd
define i32 @f1(i8* %ptr, i64 %val) nounwind {
entry:
%tmp4 = trunc i64 %val to i32
%tmp6 = lshr i64 %val, 32
%tmp7 = trunc i64 %tmp6 to i32
%strexd = tail call i32 @llvm.arm.strexd(i32 %tmp4, i32 %tmp7, i8* %ptr)
ret i32 %strexd
}
declare %0 @llvm.arm.ldrexd(i8*) nounwind readonly
declare i32 @llvm.arm.strexd(i32, i32, i8*) nounwind
; CHECK-LABEL: test_load_i8:
; CHECK: ldrexb r0, [r0]
; CHECK-NOT: uxtb
; CHECK-NOT: and
define zeroext i8 @test_load_i8(i8* %addr) {
%val = call i32 @llvm.arm.ldrex.p0i8(i8* %addr)
%val8 = trunc i32 %val to i8
ret i8 %val8
}
; CHECK-LABEL: test_load_i16:
; CHECK: ldrexh r0, [r0]
; CHECK-NOT: uxth
; CHECK-NOT: and
define zeroext i16 @test_load_i16(i16* %addr) {
%val = call i32 @llvm.arm.ldrex.p0i16(i16* %addr)
%val16 = trunc i32 %val to i16
ret i16 %val16
}
; CHECK-LABEL: test_load_i32:
; CHECK: ldrex r0, [r0]
define i32 @test_load_i32(i32* %addr) {
%val = call i32 @llvm.arm.ldrex.p0i32(i32* %addr)
ret i32 %val
}
declare i32 @llvm.arm.ldrex.p0i8(i8*) nounwind readonly
declare i32 @llvm.arm.ldrex.p0i16(i16*) nounwind readonly
declare i32 @llvm.arm.ldrex.p0i32(i32*) nounwind readonly
; CHECK-LABEL: test_store_i8:
; CHECK-NOT: uxtb
; CHECK: strexb r0, r1, [r2]
define i32 @test_store_i8(i32, i8 %val, i8* %addr) {
%extval = zext i8 %val to i32
%res = call i32 @llvm.arm.strex.p0i8(i32 %extval, i8* %addr)
ret i32 %res
}
; CHECK-LABEL: test_store_i16:
; CHECK-NOT: uxth
; CHECK: strexh r0, r1, [r2]
define i32 @test_store_i16(i32, i16 %val, i16* %addr) {
%extval = zext i16 %val to i32
%res = call i32 @llvm.arm.strex.p0i16(i32 %extval, i16* %addr)
ret i32 %res
}
; CHECK-LABEL: test_store_i32:
; CHECK: strex r0, r1, [r2]
define i32 @test_store_i32(i32, i32 %val, i32* %addr) {
%res = call i32 @llvm.arm.strex.p0i32(i32 %val, i32* %addr)
ret i32 %res
}
declare i32 @llvm.arm.strex.p0i8(i32, i8*) nounwind
declare i32 @llvm.arm.strex.p0i16(i32, i16*) nounwind
declare i32 @llvm.arm.strex.p0i32(i32, i32*) nounwind
; CHECK-LABEL: test_clear:
; CHECK: clrex
define void @test_clear() {
call void @llvm.arm.clrex()
ret void
}
declare void @llvm.arm.clrex() nounwind
@base = global i32* null
define void @excl_addrmode() {
; CHECK-T2ADDRMODE-LABEL: excl_addrmode:
%base1020 = load i32*, i32** @base
%offset1020 = getelementptr i32, i32* %base1020, i32 255
call i32 @llvm.arm.ldrex.p0i32(i32* %offset1020)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %offset1020)
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [{{r[0-9]+}}, #1020]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [{{r[0-9]+}}, #1020]
%base1024 = load i32*, i32** @base
%offset1024 = getelementptr i32, i32* %base1024, i32 256
call i32 @llvm.arm.ldrex.p0i32(i32* %offset1024)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %offset1024)
; CHECK-T2ADDRMODE: add.w r[[ADDR:[0-9]+]], {{r[0-9]+}}, #1024
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [r[[ADDR]]]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [r[[ADDR]]]
%base1 = load i32*, i32** @base
%addr8 = bitcast i32* %base1 to i8*
%offset1_8 = getelementptr i8, i8* %addr8, i32 1
%offset1 = bitcast i8* %offset1_8 to i32*
call i32 @llvm.arm.ldrex.p0i32(i32* %offset1)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %offset1)
; CHECK-T2ADDRMODE: adds r[[ADDR:[0-9]+]], #1
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [r[[ADDR]]]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [r[[ADDR]]]
%local = alloca i8, i32 1024
%local32 = bitcast i8* %local to i32*
call i32 @llvm.arm.ldrex.p0i32(i32* %local32)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %local32)
; CHECK-T2ADDRMODE: mov r[[ADDR:[0-9]+]], sp
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [r[[ADDR]]]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [r[[ADDR]]]
ret void
}
define void @test_excl_addrmode_folded() {
; CHECK-LABEL: test_excl_addrmode_folded:
%local = alloca i8, i32 4096
%local.0 = getelementptr i8, i8* %local, i32 4
%local32.0 = bitcast i8* %local.0 to i32*
call i32 @llvm.arm.ldrex.p0i32(i32* %local32.0)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %local32.0)
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [sp, #4]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [sp, #4]
%local.1 = getelementptr i8, i8* %local, i32 1020
%local32.1 = bitcast i8* %local.1 to i32*
call i32 @llvm.arm.ldrex.p0i32(i32* %local32.1)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %local32.1)
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [sp, #1020]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [sp, #1020]
ret void
}
define void @test_excl_addrmode_range() {
; CHECK-LABEL: test_excl_addrmode_range:
%local = alloca i8, i32 4096
%local.0 = getelementptr i8, i8* %local, i32 1024
%local32.0 = bitcast i8* %local.0 to i32*
call i32 @llvm.arm.ldrex.p0i32(i32* %local32.0)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %local32.0)
; CHECK-T2ADDRMODE: mov r[[TMP:[0-9]+]], sp
; CHECK-T2ADDRMODE: add.w r[[ADDR:[0-9]+]], r[[TMP]], #1024
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [r[[ADDR]]]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [r[[ADDR]]]
ret void
}
define void @test_excl_addrmode_align() {
; CHECK-LABEL: test_excl_addrmode_align:
%local = alloca i8, i32 4096
%local.0 = getelementptr i8, i8* %local, i32 2
%local32.0 = bitcast i8* %local.0 to i32*
call i32 @llvm.arm.ldrex.p0i32(i32* %local32.0)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %local32.0)
; CHECK-T2ADDRMODE: mov r[[ADDR:[0-9]+]], sp
; CHECK-T2ADDRMODE: adds r[[ADDR:[0-9]+]], #2
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [r[[ADDR]]]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [r[[ADDR]]]
ret void
}
define void @test_excl_addrmode_sign() {
; CHECK-LABEL: test_excl_addrmode_sign:
%local = alloca i8, i32 4096
%local.0 = getelementptr i8, i8* %local, i32 -4
%local32.0 = bitcast i8* %local.0 to i32*
call i32 @llvm.arm.ldrex.p0i32(i32* %local32.0)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %local32.0)
; CHECK-T2ADDRMODE: mov r[[ADDR:[0-9]+]], sp
; CHECK-T2ADDRMODE: subs r[[ADDR:[0-9]+]], #4
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [r[[ADDR]]]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [r[[ADDR]]]
ret void
}
define void @test_excl_addrmode_combination() {
; CHECK-LABEL: test_excl_addrmode_combination:
%local = alloca i8, i32 4096
%unused = alloca i8, i32 64
%local.0 = getelementptr i8, i8* %local, i32 4
%local32.0 = bitcast i8* %local.0 to i32*
call i32 @llvm.arm.ldrex.p0i32(i32* %local32.0)
call i32 @llvm.arm.strex.p0i32(i32 0, i32* %local32.0)
; CHECK-T2ADDRMODE: ldrex {{r[0-9]+}}, [sp, #68]
; CHECK-T2ADDRMODE: strex {{r[0-9]+}}, {{r[0-9]+}}, [sp, #68]
ret void
}
; LLVM should know, even across basic blocks, that ldrex is setting the high
; bits of its i32 to 0. There should be no zero-extend operation.
define zeroext i8 @test_cross_block_zext_i8(i1 %tst, i8* %addr) {
; CHECK: test_cross_block_zext_i8:
; CHECK-NOT: uxtb
; CHECK-NOT: and
; CHECK: bx lr
%val = call i32 @llvm.arm.ldrex.p0i8(i8* %addr)
br i1 %tst, label %end, label %mid
mid:
ret i8 42
end:
%val8 = trunc i32 %val to i8
ret i8 %val8
}
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