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Reid Kleckner e29583d0d2 [ArgPromotion] Preserve alignment of byval argument in new alloca
The frontend may have requested a higher alignment for any reason, and
downstream optimizations may already have taken advantage of it.  We
should keep the same alignment when moving the allocation from the
parameter area to the local variable area.

Fixes PR34038

llvm-svn: 310071
2017-08-04 17:09:11 +00:00

51 lines
1.5 KiB
LLVM

; RUN: opt < %s -argpromotion -S | FileCheck %s
; RUN: opt < %s -passes=argpromotion -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
%struct.ss = type { i32, i64 }
define internal void @f(%struct.ss* byval %b) nounwind {
entry:
%tmp = getelementptr %struct.ss, %struct.ss* %b, i32 0, i32 0
%tmp1 = load i32, i32* %tmp, align 4
%tmp2 = add i32 %tmp1, 1
store i32 %tmp2, i32* %tmp, align 4
ret void
}
; CHECK-LABEL: define internal void @f(i32 %b.0, i64 %b.1)
; CHECK: alloca %struct.ss{{$}}
; CHECK: store i32 %b.0
; CHECK: store i64 %b.1
define internal void @g(%struct.ss* byval align 32 %b) nounwind {
entry:
%tmp = getelementptr %struct.ss, %struct.ss* %b, i32 0, i32 0
%tmp1 = load i32, i32* %tmp, align 4
%tmp2 = add i32 %tmp1, 1
store i32 %tmp2, i32* %tmp, align 4
ret void
}
; CHECK-LABEL: define internal void @g(i32 %b.0, i64 %b.1)
; CHECK: alloca %struct.ss, align 32
; CHECK: store i32 %b.0
; CHECK: store i64 %b.1
define i32 @main() nounwind {
entry:
%S = alloca %struct.ss
%tmp1 = getelementptr %struct.ss, %struct.ss* %S, i32 0, i32 0
store i32 1, i32* %tmp1, align 8
%tmp4 = getelementptr %struct.ss, %struct.ss* %S, i32 0, i32 1
store i64 2, i64* %tmp4, align 4
call void @f(%struct.ss* byval %S) nounwind
call void @g(%struct.ss* byval %S) nounwind
ret i32 0
}
; CHECK-LABEL: define i32 @main
; CHECK: call void @f(i32 %{{.*}}, i64 %{{.*}})
; CHECK: call void @g(i32 %{{.*}}, i64 %{{.*}})