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db2d7a34b2
This allows rematerialization during register coalescing to handle
more cases involving operations like SUBREG_TO_REG which might need to
be rematerialized using sub-register indices.
For example, code like:
v1(GPR64):sub_32 = MOVZ something
v2(GPR64) = COPY v1(GPR64)
should be convertable to:
v2(GPR64):sub_32 = MOVZ something
but previously we just gave up in places like this
llvm-svn: 182872
98 lines
2.4 KiB
LLVM
98 lines
2.4 KiB
LLVM
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu | FileCheck %s
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declare void @callee_stack0()
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declare void @callee_stack8([8 x i32], i64)
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declare void @callee_stack16([8 x i32], i64, i64)
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define void @caller_to0_from0() nounwind {
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; CHECK: caller_to0_from0:
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; CHECK-NEXT: // BB
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tail call void @callee_stack0()
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ret void
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; CHECK-NEXT: b callee_stack0
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}
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define void @caller_to0_from8([8 x i32], i64) nounwind{
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; CHECK: caller_to0_from8:
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; CHECK-NEXT: // BB
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tail call void @callee_stack0()
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ret void
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; CHECK-NEXT: b callee_stack0
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}
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define void @caller_to8_from0() {
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; CHECK: caller_to8_from0:
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; Caller isn't going to clean up any extra stack we allocate, so it
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; can't be a tail call.
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tail call void @callee_stack8([8 x i32] undef, i64 42)
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ret void
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; CHECK: bl callee_stack8
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}
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define void @caller_to8_from8([8 x i32], i64 %a) {
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; CHECK: caller_to8_from8:
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; CHECK-NOT: sub sp, sp,
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; This should reuse our stack area for the 42
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tail call void @callee_stack8([8 x i32] undef, i64 42)
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ret void
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; CHECK: str {{x[0-9]+}}, [sp]
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; CHECK-NEXT: b callee_stack8
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}
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define void @caller_to16_from8([8 x i32], i64 %a) {
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; CHECK: caller_to16_from8:
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; Shouldn't be a tail call: we can't use SP+8 because our caller might
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; have something there. This may sound obvious but implementation does
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; some funky aligning.
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tail call void @callee_stack16([8 x i32] undef, i64 undef, i64 undef)
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; CHECK: bl callee_stack16
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ret void
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}
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define void @caller_to8_from24([8 x i32], i64 %a, i64 %b, i64 %c) {
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; CHECK: caller_to8_from24:
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; CHECK-NOT: sub sp, sp
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; Reuse our area, putting "42" at incoming sp
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tail call void @callee_stack8([8 x i32] undef, i64 42)
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ret void
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; CHECK: str {{x[0-9]+}}, [sp]
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; CHECK-NEXT: b callee_stack8
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}
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define void @caller_to16_from16([8 x i32], i64 %a, i64 %b) {
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; CHECK: caller_to16_from16:
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; CHECK-NOT: sub sp, sp,
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; Here we want to make sure that both loads happen before the stores:
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; otherwise either %a or %b will be wrongly clobbered.
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tail call void @callee_stack16([8 x i32] undef, i64 %b, i64 %a)
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ret void
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; CHECK: ldr x0,
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; CHECK: ldr x1,
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; CHECK: str x1,
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; CHECK: str x0,
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; CHECK-NOT: add sp, sp,
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; CHECK: b callee_stack16
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}
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@func = global void(i32)* null
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define void @indirect_tail() {
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; CHECK: indirect_tail:
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; CHECK-NOT: sub sp, sp
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%fptr = load void(i32)** @func
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tail call void %fptr(i32 42)
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ret void
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; CHECK: ldr [[FPTR:x[1-9]+]], [{{x[0-9]+}}, #:lo12:func]
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; CHECK: movz w0, #42
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; CHECK: br [[FPTR]]
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}
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