mirror of
https://github.com/c64scene-ar/llvm-6502.git
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52f83a9ab3
The main issue being fixed here is that APCS targets handling a "byval align N" parameter with N > 4 were miscounting what objects were where on the stack, leading to FrameLowering setting the frame pointer incorrectly and clobbering the stack. But byval handling had grown over many years, and had multiple layers of cruft trying to compensate for each other and calculate padding correctly. This only really needs to be done once, in the HandleByVal function. Elsewhere should just do what it's told by that call. I also stripped out unnecessary APCS/AAPCS distinctions (now that Clang emits byvals with the correct C ABI alignment), which simplified HandleByVal. rdar://20095672 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231959 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
2.1 KiB
LLVM
66 lines
2.1 KiB
LLVM
; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi | FileCheck %s
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; Test that we correctly use registers and align elements when using va_arg
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%struct_t = type { double, double, double }
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@static_val = constant %struct_t { double 1.0, double 2.0, double 3.0 }
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declare void @llvm.va_start(i8*) nounwind
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declare void @llvm.va_end(i8*) nounwind
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; CHECK-LABEL: test_byval_8_bytes_alignment:
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define void @test_byval_8_bytes_alignment(i32 %i, ...) {
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entry:
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; CHECK: sub sp, sp, #12
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; CHECK: sub sp, sp, #4
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; CHECK: stmib sp, {r1, r2, r3}
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%g = alloca i8*
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%g1 = bitcast i8** %g to i8*
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call void @llvm.va_start(i8* %g1)
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; CHECK: add [[REG:(r[0-9]+)|(lr)]], {{(r[0-9]+)|(lr)}}, #7
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; CHECK: bfc [[REG]], #0, #3
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%0 = va_arg i8** %g, double
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call void @llvm.va_end(i8* %g1)
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ret void
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}
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; CHECK-LABEL: main:
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; CHECK: movw [[BASE:r[0-9]+]], :lower16:static_val
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; CHECK: movt [[BASE]], :upper16:static_val
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; ldm is not formed when the coalescer failed to coalesce everything.
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; CHECK: ldrd r2, [[TMP:r[0-9]+]], {{\[}}[[BASE]]{{\]}}
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; CHECK: movw r0, #555
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define i32 @main() {
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entry:
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call void (i32, ...)* @test_byval_8_bytes_alignment(i32 555, %struct_t* byval @static_val)
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ret i32 0
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}
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declare void @f(double);
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; CHECK-LABEL: test_byval_8_bytes_alignment_fixed_arg:
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; CHECK-NOT: str r1
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; CHECK: str r3, [sp, #12]
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; CHECK: str r2, [sp, #8]
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; CHECK-NOT: str r1
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define void @test_byval_8_bytes_alignment_fixed_arg(i32 %n1, %struct_t* byval %val) nounwind {
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entry:
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%a = getelementptr inbounds %struct_t, %struct_t* %val, i32 0, i32 0
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%0 = load double, double* %a
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call void (double)* @f(double %0)
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ret void
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}
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; CHECK-LABEL: main_fixed_arg:
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; CHECK: movw [[BASE:r[0-9]+]], :lower16:static_val
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; CHECK: movt [[BASE]], :upper16:static_val
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; ldm is not formed when the coalescer failed to coalesce everything.
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; CHECK: ldrd r2, [[TMP:r[0-9]+]], {{\[}}[[BASE]]{{\]}}
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; CHECK: movw r0, #555
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define i32 @main_fixed_arg() {
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entry:
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call void (i32, %struct_t*)* @test_byval_8_bytes_alignment_fixed_arg(i32 555, %struct_t* byval @static_val)
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ret i32 0
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}
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