9e30c96aee
LLVM intrinsics `get_fpmode`, `set_fpmode` and `reset_fpmode` operate control modes, the bits of FP environment that affect FP operations. On AArch64 these bits are in FPCR. The lowering implemented to produce code close to that of GLIBC.
69 lines
2.0 KiB
LLVM
69 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
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; RUN: llc -mtriple=aarch64-none-linux-gnu %s -o - | FileCheck --check-prefix=DAG %s
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; RUN: llc -mtriple=aarch64-none-linux-gnu -global-isel %s -o - | FileCheck --check-prefix=GIS %s
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declare i32 @llvm.get.fpmode.i32()
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declare void @llvm.set.fpmode.i32(i32 %fpmode)
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declare void @llvm.reset.fpmode()
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define i32 @func_get_fpmode() #0 {
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; DAG-LABEL: func_get_fpmode:
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; DAG: // %bb.0: // %entry
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; DAG-NEXT: mrs x0, FPCR
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; DAG-NEXT: // kill: def $w0 killed $w0 killed $x0
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; DAG-NEXT: ret
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;
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; GIS-LABEL: func_get_fpmode:
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; GIS: // %bb.0: // %entry
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; GIS-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
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; GIS-NEXT: add x0, sp, #12
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; GIS-NEXT: bl fegetmode
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; GIS-NEXT: ldr w0, [sp, #12]
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; GIS-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload
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; GIS-NEXT: ret
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entry:
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%fpmode = call i32 @llvm.get.fpmode.i32()
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ret i32 %fpmode
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}
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define void @func_set_fpmode(i32 %fpmode) #0 {
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; DAG-LABEL: func_set_fpmode:
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; DAG: // %bb.0: // %entry
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; DAG-NEXT: mov w8, w0
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; DAG-NEXT: msr FPCR, x8
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; DAG-NEXT: ret
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;
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; GIS-LABEL: func_set_fpmode:
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; GIS: // %bb.0: // %entry
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; GIS-NEXT: str x30, [sp, #-16]! // 8-byte Folded Spill
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; GIS-NEXT: str w0, [sp, #12]
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; GIS-NEXT: add x0, sp, #12
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; GIS-NEXT: bl fesetmode
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; GIS-NEXT: ldr x30, [sp], #16 // 8-byte Folded Reload
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; GIS-NEXT: ret
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entry:
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call void @llvm.set.fpmode.i32(i32 %fpmode)
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ret void
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}
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define void @func_reset_fpmode() #0 {
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; DAG-LABEL: func_reset_fpmode:
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; DAG: // %bb.0: // %entry
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; DAG-NEXT: mov x9, #-48904 // =0xffffffffffff40f8
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; DAG-NEXT: mrs x8, FPCR
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; DAG-NEXT: movk x9, #63488, lsl #16
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; DAG-NEXT: and x8, x8, x9
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; DAG-NEXT: msr FPCR, x8
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; DAG-NEXT: ret
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;
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; GIS-LABEL: func_reset_fpmode:
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; GIS: // %bb.0: // %entry
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; GIS-NEXT: mov x0, #-1 // =0xffffffffffffffff
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; GIS-NEXT: b fesetmode
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entry:
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call void @llvm.reset.fpmode()
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ret void
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}
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attributes #0 = { nounwind }
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