llvm-mirror/test/CodeGen/ARM/va_arg.ll
Rafael Espindola 84716579d4 Fix va_arg for doubles. With this patch VAARG nodes always contain the
correct alignment information, which simplifies ExpandRes_VAARG a bit.

The patch introduces a new alignment information to TargetLoweringInfo. This is
needed since the two natural candidates cannot be used:

* The 's' in target data: If this is set to the minimal alignment of any
  argument, getCallFrameTypeAlignment would return 4 for doubles on ARM for
  example.
* The getTransientStackAlignment method. It is possible for an architecture to
  have argument less aligned than what we maintain the stack pointer.

llvm-svn: 108072
2010-07-11 04:01:49 +00:00

42 lines
1.1 KiB
LLVM

; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi | FileCheck %s
; Test that we correctly align elements when using va_arg
; CHECK: test1:
; CHECK-NOT: bfc
; CHECK: add r0, r0, #7
; CHECK: bfc r0, #0, #3
; CHECK-NOT: bfc
define i64 @test1(i32 %i, ...) nounwind optsize {
entry:
%g = alloca i8*, align 4
%g1 = bitcast i8** %g to i8*
call void @llvm.va_start(i8* %g1)
%0 = va_arg i8** %g, i64
call void @llvm.va_end(i8* %g1)
ret i64 %0
}
; CHECK: test2:
; CHECK-NOT: bfc
; CHECK: add r0, r0, #7
; CHECK: bfc r0, #0, #3
; CHECK-NOT: bfc
; CHECK: bx lr
define double @test2(i32 %a, i32 %b, ...) nounwind optsize {
entry:
%ap = alloca i8*, align 4 ; <i8**> [#uses=3]
%ap1 = bitcast i8** %ap to i8* ; <i8*> [#uses=2]
call void @llvm.va_start(i8* %ap1)
%0 = va_arg i8** %ap, i32 ; <i32> [#uses=0]
%1 = va_arg i8** %ap, double ; <double> [#uses=1]
call void @llvm.va_end(i8* %ap1)
ret double %1
}
declare void @llvm.va_start(i8*) nounwind
declare void @llvm.va_end(i8*) nounwind