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-rw-r--r--llvm/test/CodeGen/ARM/v8m-tail-call.ll167
1 files changed, 137 insertions, 30 deletions
diff --git a/llvm/test/CodeGen/ARM/v8m-tail-call.ll b/llvm/test/CodeGen/ARM/v8m-tail-call.ll
index f4d3a454c70..7ee80d4b9b9 100644
--- a/llvm/test/CodeGen/ARM/v8m-tail-call.ll
+++ b/llvm/test/CodeGen/ARM/v8m-tail-call.ll
@@ -1,34 +1,65 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc %s -o - -mtriple=thumbv8m.base | FileCheck %s
declare i32 @g(...)
declare i32 @h0(i32, i32, i32, i32)
define hidden i32 @f0() {
+; CHECK-LABEL: f0:
+; CHECK: @ %bb.0:
+; CHECK-NEXT: push {r7, lr}
+; CHECK-NEXT: bl g
+; CHECK-NEXT: movs r1, #1
+; CHECK-NEXT: movs r2, #2
+; CHECK-NEXT: movs r3, #3
+; CHECK-NEXT: ldr r7, [sp, #4]
+; CHECK-NEXT: mov lr, r7
+; CHECK-NEXT: pop {r7}
+; CHECK-NEXT: add sp, #4
+; CHECK-NEXT: b h0
%1 = tail call i32 bitcast (i32 (...)* @g to i32 ()*)()
%2 = tail call i32 @h0(i32 %1, i32 1, i32 2, i32 3)
ret i32 %2
-; CHECK-LABEL: f0
-; CHECK: ldr [[POP:r[4567]]], [sp, #4]
-; CHECK-NEXT: mov lr, [[POP]]
-; CHECK-NEXT: pop {{.*}}[[POP]]
-; CHECK-NEXT: add sp, #4
-; CHECK-NEXT: b h0
}
declare i32 @h1(i32)
define hidden i32 @f1() {
+; CHECK-LABEL: f1:
+; CHECK: @ %bb.0:
+; CHECK-NEXT: push {r7, lr}
+; CHECK-NEXT: bl g
+; CHECK-NEXT: pop {r7}
+; CHECK-NEXT: pop {r1}
+; CHECK-NEXT: mov lr, r1
+; CHECK-NEXT: b h1
%1 = tail call i32 bitcast (i32 (...)* @g to i32 ()*)()
%2 = tail call i32 @h1(i32 %1)
ret i32 %2
-; CHECK-LABEL: f1
-; CHECK: pop {r7}
-; CHECK: pop {r1}
-; CHECK: mov lr, r1
-; CHECK: b h1
}
declare i32 @h2(i32, i32, i32, i32, i32)
define hidden i32 @f2(i32, i32, i32, i32, i32) {
+; CHECK-LABEL: f2:
+; CHECK: @ %bb.0:
+; CHECK-NEXT: push {r4, r5, r6, lr}
+; CHECK-NEXT: mov r4, r3
+; CHECK-NEXT: mov r5, r2
+; CHECK-NEXT: mov r6, r1
+; CHECK-NEXT: bl g
+; CHECK-NEXT: cbz r0, .LBB2_2
+; CHECK-NEXT: @ %bb.1:
+; CHECK-NEXT: mov r1, r6
+; CHECK-NEXT: mov r2, r5
+; CHECK-NEXT: mov r3, r4
+; CHECK-NEXT: ldr r4, [sp, #12]
+; CHECK-NEXT: mov lr, r4
+; CHECK-NEXT: pop {r4, r5, r6}
+; CHECK-NEXT: add sp, #4
+; CHECK-NEXT: b h2
+; CHECK-NEXT: .LBB2_2:
+; CHECK-NEXT: movs r0, #0
+; CHECK-NEXT: mvns r0, r0
+; CHECK-NEXT: pop {r4, r5, r6, pc}
%6 = tail call i32 bitcast (i32 (...)* @g to i32 ()*)()
%7 = icmp eq i32 %6, 0
br i1 %7, label %10, label %8
@@ -38,12 +69,6 @@ define hidden i32 @f2(i32, i32, i32, i32, i32) {
%11 = phi i32 [ %9, %8 ], [ -1, %5 ]
ret i32 %11
-; CHECK-LABEL: f2
-; CHECK: ldr [[POP:r[4567]]], [sp, #12]
-; CHECK-NEXT: mov lr, [[POP]]
-; CHECK-NEXT: pop {{.*}}[[POP]]
-; CHECK-NEXT: add sp, #4
-; CHECK-NEXT: b h2
}
; Make sure that tail calls to function pointers that require r0-r3 for argument
@@ -51,7 +76,17 @@ define hidden i32 @f2(i32, i32, i32, i32, i32) {
@fnptr = global i32 (i32, i32, i32, i32)* null
define i32 @test3() {
; CHECK-LABEL: test3:
-; CHECK: blx {{r[0-9]+}}
+; CHECK: @ %bb.0:
+; CHECK-NEXT: push {r4, lr}
+; CHECK-NEXT: movw r0, :lower16:fnptr
+; CHECK-NEXT: movt r0, :upper16:fnptr
+; CHECK-NEXT: ldr r4, [r0]
+; CHECK-NEXT: movs r0, #1
+; CHECK-NEXT: movs r1, #2
+; CHECK-NEXT: movs r2, #3
+; CHECK-NEXT: movs r3, #4
+; CHECK-NEXT: blx r4
+; CHECK-NEXT: pop {r4, pc}
%1 = load i32 (i32, i32, i32, i32)*, i32 (i32, i32, i32, i32)** @fnptr
%2 = tail call i32 %1(i32 1, i32 2, i32 3, i32 4)
ret i32 %2
@@ -60,7 +95,17 @@ define i32 @test3() {
@fnptr2 = global i32 (i32, i32, i64)* null
define i32 @test4() {
; CHECK-LABEL: test4:
-; CHECK: blx {{r[0-9]+}}
+; CHECK: @ %bb.0:
+; CHECK-NEXT: push {r4, lr}
+; CHECK-NEXT: movw r0, :lower16:fnptr2
+; CHECK-NEXT: movt r0, :upper16:fnptr2
+; CHECK-NEXT: ldr r4, [r0]
+; CHECK-NEXT: movs r0, #1
+; CHECK-NEXT: movs r1, #2
+; CHECK-NEXT: movs r2, #3
+; CHECK-NEXT: movs r3, #0
+; CHECK-NEXT: blx r4
+; CHECK-NEXT: pop {r4, pc}
%1 = load i32 (i32, i32, i64)*, i32 (i32, i32, i64)** @fnptr2
%2 = tail call i32 %1(i32 1, i32 2, i64 3)
ret i32 %2
@@ -72,9 +117,13 @@ define i32 @test4() {
@fnptr3 = global i32 (i32, i32)* null
define i32 @test5() {
; CHECK-LABEL: test5:
-; CHECK: ldr [[REG:r[0-9]+]]
-; CHECK: bx [[REG]]
-; CHECK-NOT: blx [[REG]]
+; CHECK: @ %bb.0:
+; CHECK-NEXT: movw r0, :lower16:fnptr3
+; CHECK-NEXT: movt r0, :upper16:fnptr3
+; CHECK-NEXT: ldr r2, [r0]
+; CHECK-NEXT: movs r0, #1
+; CHECK-NEXT: movs r1, #2
+; CHECK-NEXT: bx r2
%1 = load i32 (i32, i32)*, i32 (i32, i32)** @fnptr3
%2 = tail call i32 %1(i32 1, i32 2)
ret i32 %2
@@ -84,9 +133,14 @@ define i32 @test5() {
@fnptr4 = global i32 (i32, i64)* null
define i32 @test6() {
; CHECK-LABEL: test6:
-; CHECK: ldr [[REG:r[0-9]+]]
-; CHECK: bx [[REG]]
-; CHECK-NOT: blx [[REG]]
+; CHECK: @ %bb.0:
+; CHECK-NEXT: movw r0, :lower16:fnptr4
+; CHECK-NEXT: movt r0, :upper16:fnptr4
+; CHECK-NEXT: ldr r1, [r0]
+; CHECK-NEXT: movs r0, #1
+; CHECK-NEXT: movs r2, #2
+; CHECK-NEXT: movs r3, #0
+; CHECK-NEXT: bx r1
%1 = load i32 (i32, i64)*, i32 (i32, i64)** @fnptr4
%2 = tail call i32 %1(i32 1, i64 2)
ret i32 %2
@@ -96,8 +150,12 @@ define i32 @test6() {
; tail-call optimized.
define i32 @test7() {
; CHECK-LABEL: test7:
-; CHECK: b bar
-; CHECK-NOT: bl bar
+; CHECK: @ %bb.0:
+; CHECK-NEXT: movs r0, #1
+; CHECK-NEXT: movs r1, #2
+; CHECK-NEXT: movs r2, #3
+; CHECK-NEXT: movs r3, #4
+; CHECK-NEXT: b bar
%tail = tail call i32 @bar(i32 1, i32 2, i32 3, i32 4)
ret i32 %tail
}
@@ -109,6 +167,33 @@ declare i32 @bar(i32, i32, i32, i32)
%struct.S = type { i32 }
define void @test8(i32 (i32, i32, i32)* nocapture %fn, i32 %x) local_unnamed_addr {
+; CHECK-LABEL: test8:
+; CHECK: @ %bb.0: @ %entry
+; CHECK-NEXT: push {r4, r5, r6, r7, lr}
+; CHECK-NEXT: sub sp, #4
+; CHECK-NEXT: mov r4, r1
+; CHECK-NEXT: str r0, [sp] @ 4-byte Spill
+; CHECK-NEXT: bl test8_u
+; CHECK-NEXT: mov r5, r0
+; CHECK-NEXT: ldr r6, [r0]
+; CHECK-NEXT: movs r7, #0
+; CHECK-NEXT: mov r0, r7
+; CHECK-NEXT: bl test8_h
+; CHECK-NEXT: mov r1, r0
+; CHECK-NEXT: mov r0, r6
+; CHECK-NEXT: mov r2, r7
+; CHECK-NEXT: bl test8_g
+; CHECK-NEXT: str r4, [r5]
+; CHECK-NEXT: movs r0, #1
+; CHECK-NEXT: movs r1, #2
+; CHECK-NEXT: movs r2, #3
+; CHECK-NEXT: ldr r3, [sp] @ 4-byte Reload
+; CHECK-NEXT: add sp, #4
+; CHECK-NEXT: ldr r4, [sp, #16]
+; CHECK-NEXT: mov lr, r4
+; CHECK-NEXT: pop {r4, r5, r6, r7}
+; CHECK-NEXT: add sp, #4
+; CHECK-NEXT: bx r3
entry:
%call = tail call %struct.S* bitcast (%struct.S* (...)* @test8_u to %struct.S* ()*)()
%a = getelementptr inbounds %struct.S, %struct.S* %call, i32 0, i32 0
@@ -125,6 +210,28 @@ declare %struct.S* @test8_u(...)
declare i32 @test8_g(i32, i32, i32)
declare i32 @test8_h(i32)
-; CHECK: str r0, [sp] @ 4-byte Spill
-; CHECK: ldr r3, [sp] @ 4-byte Reload
-; CHECK: bx r3
+
+; Check that we don't introduce an unnecessary spill of lr.
+declare i32 @h9(i32, i32, i32, i32)
+define i32 @test9(i32* %x, i32* %y, i32* %z, i32* %a) {
+; CHECK-LABEL: test9:
+; CHECK: @ %bb.0:
+; CHECK-NEXT: push {r4, r7}
+; CHECK-NEXT: ldr r4, [r3]
+; CHECK-NEXT: ldr r3, [r3, #4]
+; CHECK-NEXT: adds r3, r4, r3
+; CHECK-NEXT: ldr r1, [r1]
+; CHECK-NEXT: ldr r0, [r0]
+; CHECK-NEXT: ldr r2, [r2]
+; CHECK-NEXT: pop {r4, r7}
+; CHECK-NEXT: b h9
+ %zz = load i32, i32* %z
+ %xx = load i32, i32* %x
+ %yy = load i32, i32* %y
+ %aa1 = load i32, i32* %a
+ %a2 = getelementptr i32, i32* %a, i32 1
+ %aa2 = load i32, i32* %a2
+ %aa = add i32 %aa1, %aa2
+ %r = tail call i32 @h9(i32 %xx, i32 %yy, i32 %zz, i32 %aa)
+ ret i32 %r
+}
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