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20b48697cd
having to do a double cast (uint64_t --> double --> float). This is based on the algorithm from compiler_rt's __floatundisf for X86-64. llvm-svn: 115634
22 lines
662 B
LLVM
22 lines
662 B
LLVM
; RUN: llc < %s -march=x86-64 | FileCheck %s
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; Verify that we are using the efficient uitofp --> sitofp lowering illustrated
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; by the compiler_rt implementation of __floatundisf.
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; <rdar://problem/8493982>
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10.0.0"
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; CHECK: testq %rdi, %rdi
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; CHECK-NEXT: jns LBB0_2
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; CHECK: shrq
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; CHECK-NEXT: andq
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; CHECK-NEXT: orq
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; CHECK-NEXT: cvtsi2ss
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; CHECK: LBB0_2
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; CHECK-NEXT: cvtsi2ss
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define float @test(i64 %a) {
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entry:
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%b = uitofp i64 %a to float
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ret float %b
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}
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