89f36dd8f3
As stated in https://discourse.llvm.org/t/rfc-llc-add-expandlargeintfpconvert-pass-for-fp-int-conversion-of-large-bitint/65528, this implementation is very similar to ExpandLargeDivRem, which expands ‘fptoui .. to’, ‘fptosi .. to’, ‘uitofp .. to’, ‘sitofp .. to’ instructions with a bitwidth above a threshold into auto-generated functions. This is useful for targets like x86_64 that cannot lower fp convertions with more than 128 bits. The expanded nodes are referring from the IR generated by `compiler-rt/lib/builtins/floattidf.c`, `compiler-rt/lib/builtins/fixdfti.c`, and etc. Corner cases: 1. For fp16: as there is no related builtins added in compliler-rt. So I mainly utilized the fp32 <-> fp16 lib calls to implement. 2. For fp80: as this pass is soft fp emulation and no fp80 instructions can help in this problem. I recommend users to deprecate this usage. For now, the implementation uses fp128 as the temporary conversion type and inserts fptrunc/ext at top/end of the function. 3. For bf16: as clang FE currently doesn't support bf16 algorithm operations (convert to int, float, +, -, *, ...), this patch doesn't consider bf16 for now. 4. For unsigned FPToI: since both default hardware behaviors and libgcc are ignoring "returns 0 for negative input" spec. This pass follows this old way to ignore unsigned FPToI. See this example: https://gcc.godbolt.org/z/bnv3jqW1M The end-to-end tests are uploaded at https://reviews.llvm.org/D138261 Reviewed By: LuoYuanke, mgehre-amd Differential Revision: https://reviews.llvm.org/D137241
131 lines
2.9 KiB
LLVM
131 lines
2.9 KiB
LLVM
; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefixes=CHECK,X86
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefixes=CHECK,X64
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define i129 @fptosi_float(float %a) nounwind {
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; CHECK-LABEL: fptosi_float:
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; CHECK-NOT: call
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%res = fptosi float %a to i129
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ret i129 %res
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}
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define i129 @fptosi_double(double %a) nounwind {
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; CHECK-LABEL: fptosi_double:
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; CHECK-NOT: call
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%res = fptosi double %a to i129
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ret i129 %res
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}
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define i129 @fptosi_fp128(fp128 %a) nounwind {
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; CHECK-LABEL: fptosi_fp128:
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; CHECK-NOT: call
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%res = fptosi fp128 %a to i129
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ret i129 %res
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}
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define i129 @fptoui_float(float %a) nounwind {
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; CHECK-LABEL: fptoui_float:
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; CHECK-NOT: call
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%res = fptoui float %a to i129
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ret i129 %res
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}
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define i129 @fptoui_double(double %a) nounwind {
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; CHECK-LABEL: fptoui_double:
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; CHECK-NOT: call
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%res = fptoui double %a to i129
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ret i129 %res
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}
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define i129 @fptoui_fp128(fp128 %a) nounwind {
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; CHECK-LABEL: fptoui_fp128:
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; CHECK-NOT: call
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%res = fptoui fp128 %a to i129
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ret i129 %res
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}
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define float @sitofp_float(i129 %a) nounwind {
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; CHECK-LABEL: sitofp_float:
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; CHECK-NOT: call
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%res = sitofp i129 %a to float
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ret float %res
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}
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define double @sitofp_double(i129 %a) nounwind {
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; CHECK-LABEL: sitofp_double:
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; CHECK-NOT: call
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%res = sitofp i129 %a to double
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ret double %res
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}
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define fp128 @sitofp_fp128(i129 %a) nounwind {
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; CHECK-LABEL: sitofp_fp128:
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; CHECK-NOT: call
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%res = sitofp i129 %a to fp128
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ret fp128 %res
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}
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define float @uitofp_float(i129 %a) nounwind {
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; CHECK-LABEL: uitofp_float:
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; CHECK-NOT: call
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%res = uitofp i129 %a to float
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ret float %res
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}
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define double @uitofp_double(i129 %a) nounwind {
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; CHECK-LABEL: uitofp_double:
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; CHECK-NOT: call
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%res = uitofp i129 %a to double
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ret double %res
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}
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define fp128 @uitofp_fp128(i129 %a) nounwind {
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; CHECK-LABEL: uitofp_fp128:
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; CHECK-NOT: call
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%res = uitofp i129 %a to fp128
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ret fp128 %res
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}
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; higher sizes
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define i257 @fptosi257_double(double %a) nounwind {
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; CHECK-LABEL: fptosi257_double:
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; CHECK-NOT: call
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%res = fptosi double %a to i257
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ret i257 %res
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}
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; half tests
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define i257 @fptosi_half(half %a) nounwind {
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; X86-LABEL: fptosi_half:
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; X86: __gnu_h2f_ieee
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;
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; X64-LABEL: fptosi_half:
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; X64: __extendhfsf2
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%res = fptosi half %a to i257
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ret i257 %res
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}
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define half @uitofp_half(i257 %a) nounwind {
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; X86-LABEL: uitofp_half:
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; X86: __gnu_f2h_ieee
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;
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; X64-LABEL: uitofp_half:
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; X64: __truncsfhf2
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%res = uitofp i257 %a to half
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ret half %res
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}
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; x86_fp80 tests
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define i257 @fptoui_x86_fp80(x86_fp80 %a) nounwind {
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; CHECK-LABEL: fptoui_x86_fp80:
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; CHECK: __extendxftf2
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%res = fptoui x86_fp80 %a to i257
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ret i257 %res
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}
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define x86_fp80 @sitofp_x86_fp80(i257 %a) nounwind {
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; CHECK-LABEL: sitofp_x86_fp80:
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; CHECK: __trunctfxf2
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%res = sitofp i257 %a to x86_fp80
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ret x86_fp80 %res
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}
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