all: delete riscv64 non-register ABI fallback path

Change-Id: I9e997b59ffb868575b780b9660df1f5ac322b79a
Reviewed-on: https://go-review.googlesource.com/c/go/+/443556
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: David Chase <drchase@google.com>

4 files changed, 0 insertions, 79 deletions

diff --git a/src/internal/bytealg/compare_riscv64.s b/src/internal/bytealg/compare_riscv64.s
index e616577d53..44a743d3af 100644
--- a/src/internal/bytealg/compare_riscv64.s
+++ b/src/internal/bytealg/compare_riscv64.s
@@ -6,13 +6,6 @@
 #include "textflag.h"
 
 TEXT ·Compare<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-56
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	a_base+0(FP), X10
-	MOV	a_len+8(FP), X11
-	MOV	b_base+24(FP), X12
-	MOV	b_len+32(FP), X13
-	MOV	$ret+48(FP), X14
-#else
 	// X10 = a_base
 	// X11 = a_len
 	// X12 = a_cap (unused)
@@ -21,17 +14,9 @@ TEXT ·Compare<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-56
 	// X15 = b_cap (unused)
 	MOV	X13, X12
 	MOV	X14, X13
-#endif
 	JMP	compare<>(SB)
 
 TEXT runtime·cmpstring<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-40
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	a_base+0(FP), X10
-	MOV	a_len+8(FP), X11
-	MOV	b_base+16(FP), X12
-	MOV	b_len+24(FP), X13
-	MOV	$ret+32(FP), X14
-#endif
 	// X10 = a_base
 	// X11 = a_len
 	// X12 = b_base
@@ -199,7 +184,4 @@ cmp:
 	SLTU	X8, X9, X6
 cmp_ret:
 	SUB	X5, X6, X10
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	X10, (X14)
-#endif
 	RET
diff --git a/src/internal/bytealg/count_riscv64.s b/src/internal/bytealg/count_riscv64.s
index a15d07d768..d123cbd7c6 100644
--- a/src/internal/bytealg/count_riscv64.s
+++ b/src/internal/bytealg/count_riscv64.s
@@ -6,17 +6,11 @@
 #include "textflag.h"
 
 TEXT ·Count<ABIInternal>(SB),NOSPLIT,$0-40
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	b_base+0(FP), X10
-	MOV	b_len+8(FP), X11
-	MOVBU	c+24(FP), X12	// byte to count
-#else
 	// X10 = b_base
 	// X11 = b_len
 	// X12 = b_cap (unused)
 	// X13 = byte to count (want in X12)
 	AND	$0xff, X13, X12
-#endif
 	MOV	ZERO, X14	// count
 	ADD	X10, X11	// end
 
@@ -29,19 +23,10 @@ loop:
 	JMP	loop
 
 done:
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	X14, ret+32(FP)
-#else
 	MOV	X14, X10
-#endif
 	RET
 
 TEXT ·CountString<ABIInternal>(SB),NOSPLIT,$0-32
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	s_base+0(FP), X10
-	MOV	s_len+8(FP), X11
-	MOVBU	c+16(FP), X12	// byte to count
-#endif
 	// X10 = s_base
 	// X11 = s_len
 	// X12 = byte to count
@@ -58,9 +43,5 @@ loop:
 	JMP	loop
 
 done:
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	X14, ret+24(FP)
-#else
 	MOV	X14, X10
-#endif
 	RET
diff --git a/src/internal/bytealg/equal_riscv64.s b/src/internal/bytealg/equal_riscv64.s
index 1e070beb3e..3834083ec9 100644
--- a/src/internal/bytealg/equal_riscv64.s
+++ b/src/internal/bytealg/equal_riscv64.s
@@ -9,12 +9,6 @@
 
 // func memequal(a, b unsafe.Pointer, size uintptr) bool
 TEXT runtime·memequal<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-25
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	a+0(FP), X10
-	MOV	b+8(FP), X11
-	MOV	size+16(FP), X12
-	MOV	$ret+24(FP), X13
-#endif
 	// X10 = a_base
 	// X11 = b_base
 	// X12 = size
@@ -23,11 +17,6 @@ TEXT runtime·memequal<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-25
 // func memequal_varlen(a, b unsafe.Pointer) bool
 TEXT runtime·memequal_varlen<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-17
 	MOV	8(CTXT), X12    // compiler stores size at offset 8 in the closure
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	a+0(FP), X10
-	MOV	b+8(FP), X11
-	MOV	$ret+16(FP), X13
-#endif
 	// X10 = a_base
 	// X11 = b_base
 	JMP	memequal<>(SB)
@@ -128,17 +117,8 @@ loop1:
 	JMP	loop1
 
 not_eq:
-#ifndef GOEXPERIMENT_regabiargs
-	MOVB	ZERO, (X13)
-#else
 	MOVB	ZERO, X10
-#endif
 	RET
 eq:
-#ifndef GOEXPERIMENT_regabiargs
 	MOV	$1, X10
-	MOVB	X10, (X13)
-#else
-	MOV	$1, X10
-#endif
 	RET
diff --git a/src/internal/bytealg/indexbyte_riscv64.s b/src/internal/bytealg/indexbyte_riscv64.s
index a20396592b..8be78ed950 100644
--- a/src/internal/bytealg/indexbyte_riscv64.s
+++ b/src/internal/bytealg/indexbyte_riscv64.s
@@ -6,11 +6,6 @@
 #include "textflag.h"
 
 TEXT ·IndexByte<ABIInternal>(SB),NOSPLIT,$0-40
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	b_base+0(FP), X10
-	MOV	b_len+8(FP), X11
-	MOVBU	c+24(FP), X13	// byte to find
-#endif
 	// X10 = b_base
 	// X11 = b_len
 	// X12 = b_cap (unused)
@@ -27,24 +22,13 @@ loop:
 	BNE	X13, X14, loop
 
 	SUB	X12, X10		// remove base
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	X10, ret+32(FP)
-#endif
 	RET
 
 notfound:
 	MOV	$-1, X10
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	X10, ret+32(FP)
-#endif
 	RET
 
 TEXT ·IndexByteString<ABIInternal>(SB),NOSPLIT,$0-32
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	s_base+0(FP), X10
-	MOV	s_len+8(FP), X11
-	MOVBU	c+16(FP), X12	// byte to find
-#endif
 	// X10 = b_base
 	// X11 = b_len
 	// X12 = byte to find
@@ -60,14 +44,8 @@ loop:
 	BNE	X12, X14, loop
 
 	SUB	X13, X10		// remove base
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	X10, ret+24(FP)
-#endif
 	RET
 
 notfound:
 	MOV	$-1, X10
-#ifndef GOEXPERIMENT_regabiargs
-	MOV	X10, ret+24(FP)
-#endif
 	RET