derek.holloway
7502bf64a4
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83 lines
2.1 KiB
LLVM
83 lines
2.1 KiB
LLVM
; RUN: llc < %s -mtriple=i686-linux-gnu | FileCheck %s --check-prefix=CHECK --check-prefix=LIN32
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; RUN: llc < %s -mtriple=x86_64-linux-gnu | FileCheck %s --check-prefix=CHECK --check-prefix=LIN64
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; RUN: llc < %s -mtriple=x86_64-pc-win32 | FileCheck %s --check-prefix=CHECK --check-prefix=WIN64
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; Check that we only fold the address computation (load) into a tail call
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; when we're sure there is enough volatile registers available.
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@globl = global ptr null
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; CHECK-LABEL: test0:
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define i32 @test0(ptr %a, ptr %b) {
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entry:
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%func = load ptr, ptr %a
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%call = tail call i32 %func()
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ret i32 %call
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; Call address load gets folded into the tail call.
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; LIN32: jmpl *(%
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; LIN64: jmpq *(%
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; WIN64: jmpq *(%
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}
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; CHECK-LABEL: test1:
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define i32 @test1(ptr %a, ptr %b) {
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entry:
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%func = load ptr, ptr %a
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%call = tail call i32 %func(i32 inreg 1)
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ret i32 %call
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; Call address load gets folded into the tail call.
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; LIN32: jmpl *(%
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; LIN64: jmpq *(%
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; WIN64: jmpq *(%
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}
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; CHECK-LABEL: test2:
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define i32 @test2(ptr %a, ptr %b) {
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entry:
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%func = load ptr, ptr %a
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%call = tail call i32 %func(i32 inreg 1, i32 inreg 2)
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ret i32 %call
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; On 32-bit we're not sure there is enough register to fold the load.
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; LIN32: jmpl *%
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; LIN64: jmpq *(%
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; WIN64: jmpq *(%
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}
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; CHECK-LABEL: test2_globl:
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define i32 @test2_globl(ptr %a, ptr %b) {
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entry:
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%func = load ptr, ptr @globl
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%call = tail call i32 %func(i32 inreg 1, i32 inreg 2)
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ret i32 %call
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; .. but if the load is from a global, we can fold it.
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; LIN32: jmpl *globl
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; LIN64: jmpq *(%
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; WIN64: jmpq *globl(%rip)
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}
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; CHECK-LABEL: test2_stack:
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define i32 @test2_stack(ptr %func, ptr %b) {
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entry:
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%call = tail call i32 %func(i32 inreg 1, i32 inreg 2)
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ret i32 %call
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; and if the load is from the stack (on 32-bit, %func is passed on the stack):
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; LIN32: jmpl *4(%esp)
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}
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define i32 @test6(ptr %a, ptr %b) {
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entry:
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%func = load ptr, ptr %a
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%call = tail call i32 %func(i32 inreg 1, i32 inreg 2, i32 inreg 3, i32 inreg 4, i32 inreg 5, i32 inreg 6)
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ret i32 %call
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; LIN64: jmpq *(%
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; I wasn't able to pass more than 4 arguments in registers on Win64.
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; WIN64: callq *(
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}
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