From e2cfc1eb3affe8bcdfeca4a9f0a2d7902dbb940f Mon Sep 17 00:00:00 2001 From: Joel Sing Date: Fri, 12 Sep 2025 20:54:49 +1000 Subject: cmd/internal/obj/riscv: improve handling of float point moves Translate moves from an integer register to a floating point register, or from a floating point register to an integer register, to the appropriate move instruction (i.e. FMVXW/FMVWX/FMVXD/FMVDX). Add support for MOVF with a constant - we previously added support for MOVD but not for MOVF. Add special handling for 0.0, which we can translate to a move from the zero register to a floating point register (leveraging the above mentioned change). Change-Id: If8df2f5610e69b4ec0af85efb884951024685f5b Reviewed-on: https://go-review.googlesource.com/c/go/+/703216 Reviewed-by: Meng Zhuo Reviewed-by: Mark Freeman Reviewed-by: Michael Knyszek LUCI-TryBot-Result: Go LUCI Reviewed-by: Mark Ryan --- src/cmd/asm/internal/asm/testdata/riscv64.s | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'src/cmd/asm') diff --git a/src/cmd/asm/internal/asm/testdata/riscv64.s b/src/cmd/asm/internal/asm/testdata/riscv64.s index 4f7e7acd77..39d2faac25 100644 --- a/src/cmd/asm/internal/asm/testdata/riscv64.s +++ b/src/cmd/asm/internal/asm/testdata/riscv64.s @@ -1952,12 +1952,23 @@ start: MOVF 4(X5), F0 // 07a04200 MOVF F0, 4(X5) // 27a20200 MOVF F0, F1 // d3000020 + MOVF X1, F3 // d38100f0 + MOVF F3, X1 // d38001e0 + MOVF X0, F3 // d30100f0 + MOVF $(0.0), F3 // d30100f0 + + // Converted to load of symbol (AUIPC + FLW) + MOVF $(709.78271289338397), F3 // 970f000087a10f00 MOVD 4(X5), F0 // 07b04200 MOVD F0, 4(X5) // 27b20200 MOVD F0, F1 // d3000022 + MOVD F3, X1 // d38001e2 + MOVD X1, F3 // d38100f2 + MOVD X0, F3 // d30100f2 + MOVD $(0.0), F3 // d30100f2 - // Convert to load of symbol (AUIPC + FLD) + // Converted to load of symbol (AUIPC + FLD) MOVD $(709.78271289338397), F3 // 970f000087b10f00 // TLS load with local-exec (LUI + ADDIW + ADD of TP + load) -- cgit v1.3