2012-10-04-AAPCS-byval-align8.ll
2.09 KB
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; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi | FileCheck %s
; Test that we correctly use registers and align elements when using va_arg
%struct_t = type { double, double, double }
@static_val = constant %struct_t { double 1.0, double 2.0, double 3.0 }
declare void @llvm.va_start(i8*) nounwind
declare void @llvm.va_end(i8*) nounwind
; CHECK-LABEL: test_byval_8_bytes_alignment:
define void @test_byval_8_bytes_alignment(i32 %i, ...) {
entry:
; CHECK: sub sp, sp, #12
; CHECK: sub sp, sp, #4
; CHECK: add r0, sp, #4
; CHECK: stmib sp, {r1, r2, r3}
%g = alloca i8*
%g1 = bitcast i8** %g to i8*
call void @llvm.va_start(i8* %g1)
; CHECK: add [[REG:(r[0-9]+)|(lr)]], {{(r[0-9]+)|(lr)}}, #7
; CHECK: bic [[REG]], [[REG]], #7
%0 = va_arg i8** %g, double
call void @llvm.va_end(i8* %g1)
ret void
}
; CHECK-LABEL: main:
; CHECK: movw [[BASE:r[0-9]+]], :lower16:static_val
; CHECK: movt [[BASE]], :upper16:static_val
; ldm is not formed when the coalescer failed to coalesce everything.
; CHECK: ldrd r2, [[TMP:r[0-9]+]], {{\[}}[[BASE]]{{\]}}
; CHECK: movw r0, #555
define i32 @main() {
entry:
call void (i32, ...) @test_byval_8_bytes_alignment(i32 555, %struct_t* byval @static_val)
ret i32 0
}
declare void @f(double);
; CHECK-LABEL: test_byval_8_bytes_alignment_fixed_arg:
; CHECK-NOT: str r1
; CHECK-DAG: str r3, [sp, #12]
; CHECK-DAG: str r2, [sp, #8]
; CHECK-NOT: str r1
define void @test_byval_8_bytes_alignment_fixed_arg(i32 %n1, %struct_t* byval %val) nounwind {
entry:
%a = getelementptr inbounds %struct_t, %struct_t* %val, i32 0, i32 0
%0 = load double, double* %a
call void (double) @f(double %0)
ret void
}
; CHECK-LABEL: main_fixed_arg:
; CHECK: movw [[BASE:r[0-9]+]], :lower16:static_val
; CHECK: movt [[BASE]], :upper16:static_val
; ldm is not formed when the coalescer failed to coalesce everything.
; CHECK: ldrd r2, [[TMP:r[0-9]+]], {{\[}}[[BASE]]{{\]}}
; CHECK: movw r0, #555
define i32 @main_fixed_arg() {
entry:
call void (i32, %struct_t*) @test_byval_8_bytes_alignment_fixed_arg(i32 555, %struct_t* byval @static_val)
ret i32 0
}