llvm-project

Commit Graph

Author	SHA1	Message	Date
Alex Bradbury	9681b01c21	[RISCV] Add DAGCombine for (SplitF64 (ConstantFP x)) The SplitF64 node is used on RV32D to convert an f64 directly to a pair of i32 (necessary as bitcasting to i64 isn't legal). When performed on a ConstantFP, this will result in a FP load from the constant pool followed by a store to the stack and two integer loads from the stack (necessary as there is no way to directly move between f64 FPRs and i32 GPRs on RV32D). It's always cheaper to just materialise integers for the lo and hi parts of the FP constant, so do that instead. llvm-svn: 357341	2019-03-30 09:15:47 +00:00
Alex Bradbury	7539fa2c2d	[RISCV] Implement RV64D codegen This patch: * Adds necessary RV64D codegen patterns * Modifies CC_RISCV so it will properly handle f64 types (with soft float ABI) Note that in general there is no reason to try to select fcvt.w[u].d rather than fcvt.l[u].d for i32 conversions because fptosi/fptoui produce poison if the input won't fit into the target type. Differential Revision: https://reviews.llvm.org/D53237 llvm-svn: 352833	2019-02-01 03:53:30 +00:00
Alex Bradbury	8f296478eb	[RISCV] Add tests missed in r329871 llvm-svn: 329872	2018-04-12 05:36:44 +00:00

Author

SHA1

Message

Date

Alex Bradbury

9681b01c21

[RISCV] Add DAGCombine for (SplitF64 (ConstantFP x))

The SplitF64 node is used on RV32D to convert an f64 directly to a pair of i32
(necessary as bitcasting to i64 isn't legal). When performed on a ConstantFP,
this will result in a FP load from the constant pool followed by a store to
the stack and two integer loads from the stack (necessary as there is no way
to directly move between f64 FPRs and i32 GPRs on RV32D). It's always cheaper
to just materialise integers for the lo and hi parts of the FP constant, so do
that instead.

llvm-svn: 357341

2019-03-30 09:15:47 +00:00

Alex Bradbury

7539fa2c2d

[RISCV] Implement RV64D codegen

This patch:
* Adds necessary RV64D codegen patterns
* Modifies CC_RISCV so it will properly handle f64 types (with soft float ABI)

Note that in general there is no reason to try to select fcvt.w[u].d rather than fcvt.l[u].d for i32 conversions because fptosi/fptoui produce poison if the input won't fit into the target type.

Differential Revision: https://reviews.llvm.org/D53237

llvm-svn: 352833

2019-02-01 03:53:30 +00:00

Alex Bradbury

8f296478eb

[RISCV] Add tests missed in r329871

llvm-svn: 329872

2018-04-12 05:36:44 +00:00

3 Commits