https://bugs.llvm.org/show_bug.cgi?id=37751
Bug ID: 37751
Summary: [X86] CVTTPD2DQ/CVTTPS2DQ intrinsics must not map to
ISD::FP_TO_SINT etc.
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: andrea.dibia...@gmail.com, craig.top...@gmail.com,
efrie...@codeaurora.org, fil...@gmail.com,
greg.bedw...@sony.com, llvm-bugs@lists.llvm.org,
spatel+l...@rotateright.com
Now that we have FP_TO_*INT combines in DAGCombine (rL330437 for rounding
etc.), we can no longer safely map x86 f2i intrinsics to generic types:
X86_INTRINSIC_DATA(avx_cvtt_ps2dq_256,INTR_TYPE_1OP, ISD::FP_TO_SINT, 0)
as this will lose the intrinsics' special case handling for out of range
values.
All these values need mapping to the X86ISD equivalents (CVTTP2SI/CVTTP2UI)
instead and suitable constant folding support adding so we don't lose any
functionality.
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