derek.holloway
7502bf64a4
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51 lines
1.5 KiB
LLVM
51 lines
1.5 KiB
LLVM
; RUN: llc -o - %s | FileCheck %s
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; Make sure we do not try to compute liveness for FPSCR which in this case
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; is read before being written to (this is fine because becase FPSCR is
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; reserved).
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target triple = "thumbv7s-apple-ios"
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%struct.wibble = type { double }
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@global = common global i32 0, align 4
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@global.1 = common global i32 0, align 4
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; CHECK-LABEL: eggs:
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; CHECK: sub sp, #8
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; VMRS instruction comes before any other instruction writing FPSCR:
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; CHECK-NOT: vcmp
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; CHECK: vmrs {{r[0-9]}}, fpscr
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; CHECK: vcmp
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; ...
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; CHECK: add sp, #8
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; CHECK: bx lr
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define i32 @eggs(ptr nocapture readnone %arg) {
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bb:
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%tmp = alloca %struct.wibble, align 4
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%tmp2 = tail call i32 @llvm.get.rounding()
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%tmp3 = ptrtoint ptr %tmp to i32
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%tmp4 = sitofp i32 %tmp3 to double
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%tmp5 = fmul double %tmp4, 0x0123456789ABCDEF
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%tmp6 = fptosi double %tmp5 to i32
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%tmp7 = fcmp une double %tmp5, 0.000000e+00
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%tmp8 = sitofp i32 %tmp6 to double
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%tmp9 = fcmp une double %tmp5, %tmp8
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%tmp10 = and i1 %tmp7, %tmp9
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%tmp11 = sext i1 %tmp10 to i32
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%tmp12 = add nsw i32 %tmp11, %tmp6
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store i32 %tmp12, ptr @global, align 4
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%tmp13 = icmp ne i32 %tmp12, 0
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%tmp14 = icmp ne i32 %tmp2, 0
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%tmp15 = and i1 %tmp14, %tmp13
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br i1 %tmp15, label %bb16, label %bb18
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bb16: ; preds = %bb
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%tmp17 = load i32, ptr @global.1, align 4
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br label %bb18
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bb18: ; preds = %bb16, %bb
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ret i32 undef
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}
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declare i32 @llvm.get.rounding()
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declare i32 @zot(...)
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