derek.holloway
7502bf64a4
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87 lines
2.1 KiB
LLVM
87 lines
2.1 KiB
LLVM
; RUN: llc -mtriple=i686-- < %s | FileCheck %s
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; RUN: llc -mtriple=i686-- -O0 < %s | FileCheck %s
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; RUN: llc -mtriple=i686-- -disable-tail-calls < %s | FileCheck %s
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declare void @t1_callee(ptr)
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define void @t1(ptr %a) {
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; CHECK-LABEL: t1:
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; CHECK: jmp {{_?}}t1_callee
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musttail call void @t1_callee(ptr %a)
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ret void
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}
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declare ptr @t2_callee()
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define ptr @t2() {
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; CHECK-LABEL: t2:
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; CHECK: jmp {{_?}}t2_callee
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%v = musttail call ptr @t2_callee()
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ret ptr %v
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}
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; Complex frame layout: stack realignment with dynamic alloca.
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define void @t3(i32 %n) alignstack(32) nounwind {
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entry:
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; CHECK: t3:
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; CHECK: pushl %ebp
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; CHECK: pushl %esi
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; CHECK: andl $-32, %esp
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; CHECK: movl %esp, %esi
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; CHECK: popl %esi
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; CHECK: popl %ebp
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; CHECK-NEXT: jmp {{_?}}t3_callee
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%a = alloca i8, i32 %n
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call void @capture(ptr %a)
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musttail call void @t3_callee(i32 %n) nounwind
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ret void
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}
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declare void @capture(ptr)
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declare void @t3_callee(i32)
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; Test that we actually copy in and out stack arguments that aren't forwarded
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; without modification.
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define i32 @t4(ptr %fn, i32 %n, i32 %r) {
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; CHECK-LABEL: t4:
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; CHECK: incl %[[r:.*]]
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; CHECK: decl %[[n:.*]]
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; CHECK-DAG: movl %[[r]], {{[0-9]+}}(%esp)
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; CHECK-DAG: movl %[[n]], {{[0-9]+}}(%esp)
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; CHECK: jmpl *%{{.*}}
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entry:
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%r1 = add i32 %r, 1
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%n1 = sub i32 %n, 1
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%r2 = musttail call i32 %fn(ptr %fn, i32 %n1, i32 %r1)
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ret i32 %r2
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}
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; Combine the complex stack frame with the parameter modification.
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define i32 @t5(ptr %fn, i32 %n, i32 %r) alignstack(32) {
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; CHECK-LABEL: t5:
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; CHECK: pushl %ebp
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; CHECK: movl %esp, %ebp
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; CHECK: pushl %esi
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; Align the stack.
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; CHECK: andl $-32, %esp
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; CHECK: movl %esp, %esi
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; Modify the args.
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; CHECK: incl %[[r:.*]]
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; CHECK: decl %[[n:.*]]
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; Store them through ebp, since that's the only stable arg pointer.
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; CHECK-DAG: movl %[[r]], {{[0-9]+}}(%ebp)
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; CHECK-DAG: movl %[[n]], {{[0-9]+}}(%ebp)
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; Epilogue.
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; CHECK: leal {{[-0-9]+}}(%ebp), %esp
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; CHECK: popl %esi
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; CHECK: popl %ebp
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; CHECK: jmpl *%{{.*}}
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entry:
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%a = alloca i8, i32 %n
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call void @capture(ptr %a)
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%r1 = add i32 %r, 1
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%n1 = sub i32 %n, 1
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%r2 = musttail call i32 %fn(ptr %fn, i32 %n1, i32 %r1)
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ret i32 %r2
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}
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