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llvm-project/llvm/test/CodeGen/X86/uint64-to-float.ll

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Use a more efficient lowering of uint64_t --> float that can take advantage of hardware signed integer conversion without 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
2010-10-06 01:24:05 +08:00
; RUN: llc < %s -march=x86-64 | FileCheck %s
; Verify that we are using the efficient uitofp --> sitofp lowering illustrated
; by the compiler_rt implementation of __floatundisf.
; <rdar://problem/8493982>
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"
target triple = "x86_64-apple-darwin10.0.0"
Update live-in lists when splitting critical edges. Fixes PR10814. Patch by Jan Sjödin! llvm-svn: 141960
2011-10-15 01:25:46 +08:00
; FIXME: This test could generate this code:
;
; ## BB#0: ## %entry
; testq %rdi, %rdi
; jns LBB0_2
; ## BB#1:
; movq %rdi, %rax
; shrq %rax
; andq $1, %rdi
; orq %rax, %rdi
; cvtsi2ssq %rdi, %xmm0
; addss %xmm0, %xmm0
; ret
; LBB0_2: ## %entry
; cvtsi2ssq %rdi, %xmm0
; ret
;
; The blocks come from lowering:
;
; %vreg7<def> = CMOV_FR32 %vreg6<kill>, %vreg5<kill>, 15, %EFLAGS<imp-use>; FR32:%vreg7,%vreg6,%vreg5
;
; If the instruction had an EFLAGS<kill> flag, it wouldn't need to mark EFLAGS
; as live-in on the new blocks, and machine sinking would be able to sink
; everything below the test.
Use a more efficient lowering of uint64_t --> float that can take advantage of hardware signed integer conversion without 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
2010-10-06 01:24:05 +08:00
; CHECK: shrq
Update live-in lists when splitting critical edges. Fixes PR10814. Patch by Jan Sjödin! llvm-svn: 141960
2011-10-15 01:25:46 +08:00
; CHECK: andq
Use a more efficient lowering of uint64_t --> float that can take advantage of hardware signed integer conversion without 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
2010-10-06 01:24:05 +08:00
; CHECK-NEXT: orq
Update live-in lists when splitting critical edges. Fixes PR10814. Patch by Jan Sjödin! llvm-svn: 141960
2011-10-15 01:25:46 +08:00
; CHECK: testq %rdi, %rdi
; CHECK-NEXT: jns LBB0_2
; CHECK: cvtsi2ss
Use a more efficient lowering of uint64_t --> float that can take advantage of hardware signed integer conversion without 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
2010-10-06 01:24:05 +08:00
; CHECK: LBB0_2
Revert r144611 and r144613. These tests are actually correct, clang was miscompiling ExeDepsFix::processUses. Evan fixed the miscompilation in r144628. llvm-svn: 144630
2011-11-15 15:13:03 +08:00
; CHECK-NEXT: cvtsi2ss
Use a more efficient lowering of uint64_t --> float that can take advantage of hardware signed integer conversion without 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
2010-10-06 01:24:05 +08:00
define float @test(i64 %a) {
entry:
%b = uitofp i64 %a to float
ret float %b
}