hoist-fast-fdiv.ll
1.83 KB
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; RUN: opt -licm -S < %s | FileCheck %s
; RUN: opt -licm -enable-mssa-loop-dependency=true -verify-memoryssa -S < %s | FileCheck %s
; Function Attrs: noinline norecurse nounwind readnone ssp uwtable
define zeroext i1 @invariant_denom(double %v) #0 {
entry:
; CHECK-LABEL: @invariant_denom(
; CHECK-NEXT: entry:
; CHECK-NEXT: fdiv fast double 1.000000e+00, %v
br label %loop
loop: ; preds = %entry, %loop
%v3 = phi i32 [ 0, %entry ], [ %v11, %loop ]
%v4 = phi i32 [ 0, %entry ], [ %v12, %loop ]
%v5 = uitofp i32 %v4 to double
; CHECK-LABEL: loop:
; CHECK: fmul fast double
; CHECK-NOT: fdiv
%v6 = fdiv fast double %v5, %v
%v7 = fptoui double %v6 to i64
%v8 = and i64 %v7, 1
%v9 = xor i64 %v8, 1
%v10 = trunc i64 %v9 to i32
%v11 = add i32 %v10, %v3
%v12 = add nuw i32 %v4, 1
%v13 = icmp eq i32 %v12, -1
br i1 %v13, label %end, label %loop
end: ; preds = %loop
%v15 = phi i32 [ %v11, %loop ]
%v16 = icmp ne i32 %v15, 0
ret i1 %v16
}
define void @invariant_fdiv(float* %out, float %arg) {
; CHECK-LABEL: @invariant_fdiv(
; CHECK-NEXT: entry:
; CHECK-NEXT: %div = fdiv fast float 4.000000e+00, %arg
; CHECK-NEXT: fmul fast float %div, 0x41F0000000000000
entry:
br label %loop
loop: ; preds = %loop, %entry
%ind = phi i32 [ 0, %entry ], [ %inc, %loop ]
; CHECK-LABEL: loop:
; CHECK: getelementptr
; CHECK-NOT: fdiv
; CHECK-NOT: fmul
%div = fdiv fast float 4.000000e+00, %arg
%mul = fmul fast float %div, 0x41F0000000000000
%gep = getelementptr inbounds float, float* %out, i32 %ind
store float %mul, float* %gep, align 4
%inc = add nuw nsw i32 %ind, 1
%cond = icmp eq i32 %inc, 1024
br i1 %cond, label %exit, label %loop
exit: ; preds = %loop
ret void
}