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; RUN: llc < %s -march=x86 | grep fldz
; RUN: llc < %s -march=x86-64 | grep fld1
; This is basically this code on x86-64:
; _Complex long double test() { return 1.0; }
define {x86_fp80, x86_fp80} @test() {
%A = fpext double 1.0 to x86_fp80
%B = fpext double 0.0 to x86_fp80
ret x86_fp80 %A, x86_fp80 %B
}
;_test2:
; fld1
; fld %st(0)
; ret
define {x86_fp80, x86_fp80} @test2() {
%A = fpext double 1.0 to x86_fp80
ret x86_fp80 %A, x86_fp80 %A
}
; Uses both values.
define void @call1(x86_fp80 *%P1, x86_fp80 *%P2) {
%a = call {x86_fp80,x86_fp80} @test()
%b = getresult {x86_fp80,x86_fp80} %a, 0
store x86_fp80 %b, x86_fp80* %P1
%c = getresult {x86_fp80,x86_fp80} %a, 1
store x86_fp80 %c, x86_fp80* %P2
ret void
}
; Uses both values, requires fxch
define void @call2(x86_fp80 *%P1, x86_fp80 *%P2) {
%a = call {x86_fp80,x86_fp80} @test()
%b = getresult {x86_fp80,x86_fp80} %a, 1
store x86_fp80 %b, x86_fp80* %P1
%c = getresult {x86_fp80,x86_fp80} %a, 0
store x86_fp80 %c, x86_fp80* %P2
ret void
}
; Uses ST(0), ST(1) is dead but must be popped.
define void @call3(x86_fp80 *%P1, x86_fp80 *%P2) {
%a = call {x86_fp80,x86_fp80} @test()
%b = getresult {x86_fp80,x86_fp80} %a, 0
store x86_fp80 %b, x86_fp80* %P1
ret void
}
; Uses ST(1), ST(0) is dead and must be popped.
define void @call4(x86_fp80 *%P1, x86_fp80 *%P2) {
%a = call {x86_fp80,x86_fp80} @test()
%c = getresult {x86_fp80,x86_fp80} %a, 1
store x86_fp80 %c, x86_fp80* %P2
ret void
}
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